Package Research Articles

Digital Marketing Optimization Based on 9 Core of Marketing Strategies to Support Go-Digital Herbal MSMEs and Export Markets in Utilizing the Potential of the Madiun Regency Region

Herbal Academy Group Indonesia, an MSME in Madiun, has proliferated since 2014 with herbal products that are beneficial for health. After BPOM tests and halal certification, they faced marketing and export challenges. The author proposes digital marketing optimization to increase market reach and export readiness, involving students in this activity as part of community service. This service aims to evaluate essential aspects in the digital marketing of herbal MSMEs in Madiun, including product quality, packaging, branding, and SEO, to support go-digital and export market expansion. The results of the assessment show that several areas need improvement. Solutions include digital marketing assistance and export certification to optimize global market potential. Implementing the service involves eight months of technical assistance in digital marketing and export. This service involves three stages of validation tests: material, media, and platform. The validation of the material showed an excellent assessment with an average of 84.33%, indicating that the material was relevant and precise. Media tests were also positive, scoring the highest strategy suitability and content authenticity scores. The platform's validation received excellent ratings in all aspects, including appearance, features, and regulatory compliance, with an average of 93.33%, indicating the platform's effectiveness in supporting Herbal MSMEs in Madiun. The application of technology and innovation for Herbal MSMEs in Madiun Regency. It covers digital marketing, SEO, e-commerce, and export technologies, including SCM tools and international databases.

Designing biodegradable and antibacterial cellulose-based superhydrophobic packaging materials via large-scale self-assembly

Designing biodegradable and antibacterial cellulose-based superhydrophobic packaging materials via large-scale self-assembly

Anti-pathogenic and probiotic-friendly effect of benzyloxy pyridine derivative impregnated into bacterial cellulose matrix

Bacterial cellulose (BC) has emerged as a promising biomaterial for biomedical applications due to its unique properties. In this study, firstly, the potential of BC as a carrier material for the originally synthesized benzyloxy pyridine derivative (BeOxP), and also an antimicrobial and probiotic bacteria-friendly (on Lactiplantibacillus plantarum 299v (LP299V®) (DSM 9843)) effect of BC- BeOxP was investigated. The BC- BeOxP composite material was developed using a simple and efficient method, ensuring the uniform dispersion of BeOxP within the BC matrix. Characterization of BeOxP has been carried out with High-Resolution Mass Spectroscopy (HRMS) and Nuclear Magnetic Resonance (NMR). Additionally, BC- BeOxP was characterized by Thermogravimetric analysis (TGA), Differential thermal analysis (DTA), Scanning Electron Microscopy (SEM), Texture analysis, and Fourier-transform infrared spectroscopy (FTIR), confirming the successful integration of BeOxP without compromising the structural integrity of BC. The mechanical properties of the BC- BeOxP composites were also evaluated to ensure their suitability for drug-carrying or food-packaging applications. Antimicrobial activity of the BC- BeOxP was analyzed against Staphylococcus aureus ATCC 29213 and Escherichia coli ATCC 25922 while the probiotic-friendly effect was tested on Lactiplantibacillus plantarum 299v (LP299V®) (DSM 9843). The findings open avenues for further research of BC-based drug carriers or packaging materials for advanced biomedical applications.

Eco-Friendly Jute-Based Hybrid Nonwoven Fabric for Packaging Applications.

Eco-friendly materials must replace pure synthetic materials to protect the environment and improve human welfare. This study uses a blow room-integrated carding machine to create a filmy web by properly mixing modified jute and polyester fibers. Jute-polyester fiber blended carded webs have been utilized to produce jute-based hybrid nonwoven fabrics (JHNFs), which are subsequently given an antibacterial treatment by spraying a solution of silver nitrate, ethanol, and ammonia. The performance of the developed JHNF is evaluated by its morphological, FTIR, antibacterial, mechanical, and thermal properties. The fiber distribution of jute and polyester fibers is shown in SEM micrographs. The JHNF showed 29 and 27.8 mm ZOI against Staphylococcus aureus bacteria and Escherichia coli, respectively. The developed sample exhibited a 2.3% extension at the break and 170.8 N of breaking force. The sample confirmed itself as a water-repellent material as water could not penetrate from one surface to another when it was tested by a moisture management tester. The thermal conductivity of the produced sample was measured at 0.0839 W/m K. The lower thermal conductivity signifies a good thermally insulative packaging material. The developed jute polyester nonwoven fabric also demonstrated higher radiative heat resistance, providing a thermal barrier of 22 °C. The porosity, thickness, and density were determined at 49.59%, 0.22 mm, and 0.40 g/cm3, respectively. The sample exhibited significant thermal stability, with polymer degradation initiating at temperatures above 280 °C. The developed nonwoven fabric proves its practical utility as a packaging material, offering a viable alternative to pure synthetic packaging materials.

Effects of Packaging on Consumer Buying Decision: A Study of African Black Soap (Alata Samina)

Product packaging plays a key role in consumer purchasing decision as packaging promote brand identity and customer loyalty. However, the African black soap prepared in Ghana has not seen the best of packaging, hence, its rejection in international marketplace. It is in this vein that the researcher sought to examine effect of packaging on consumer buying decision of African black soap (Alata Samina). Correlation and cross-sectional design were used. Cluster and simple random were used to select 245 respondents. Findings revealed that best packaging influence consumers’ perception to buy local Alata Samina soap recorded a cumulative mean of 4.69198 and standard deviation of 3.31842, suggesting respondents’ agreement that best packaging induce consumer buying decision. In terms of relationship, it was clear that strong positive link exist between packaging elements and consumer buying decision; Packaging colour had r(245) = 0.882, p<0.05, Background image had r(245) = 0.881, p<0.05, Packaging materials had r(245) = 0.882, p<0.05, Font style had r(245) = 0.876, p<0.05. Printed information had r(245) = 0.772, p<0.05, Labelling, wrapper design and creativity had r(245) = 0.882, p<0.05. Standard Multiple Regression was used to analyzed the effect of packaging elements on consumer buying decision and the result were packaging colour had 53.8% and statistically significant effect of r(245) = 0.538, p<0.05. Brand image had 85.3 % and statistically significant effect of r(245) = 0.853, p<0.05. Printed information had 73.8% and statistically significant effect of r(245) = 0.738, p<0.05. Packaging materials had 62.6% and statistically significant effect of r(245) = 0.626, p<0.05. Innovation had 92.3 % and statistically significant effect of r(245) = 0.923, p<0.05. Labelling quality had 76.5% and statistically significant effect of r(245) = 0.765, p<0.05. Design of wrapper had 44.2% and statistically significant effect of r(245) = 0.442, p<0.05. However, font style had only 1.2% and this effect is not statistically significant; r(245) = 0.012, p<0.05. This means that most consumers do not believe that font style influences consumers’ purchase decision. The study recommends that Institute of Packaging Ghana, Federation of Ghanaian Exporters, Ministry of Trade and Industry, Ghana Exports Promotions Authority and Association of Ghana Industries should collaborate to improve the packaging skills of the local African black soap producer. The essence is to enable them to package their products to meet the export market standards.

Pengaruh Desain Keamasan dan Kualitas Produk terhadap Kepuasan Pelanggan pada Home Industry Snack 324

The objectives of this research are to ascertain the following: the impact of product quality on customer satisfaction; the impact of packaging design on customer satisfaction; and the combined effect of packaging design and product quality on customer satisfaction. The study's sample consisted of 96 respondents in total, and it used a quantitative descriptive technique. The following conclusions were drawn from the study's findings: The significance level is 0.00 <0.05 (below the threshold of 0.05), and the alternative hypothesis (Ha) is accepted whereas the null hypothesis (H0) is rejected since 10.491> 1.661. The Packaging Design variable (X1) of 86.4% (0.864) in Home Industry Snack 324 demonstrates a positive and significant impact on consumer satisfaction. The same goes for Ha and H0; if the result is more than 1.661 and the significance level is 0.00 <0.05 (below the threshold of 0.05), then Ha is accepted. Product Quality (X2) has a positive and significant association with Customer Satisfaction in the Household Snack Industry 324, contributing 73.3% (0.733) to it. Furthermore, customer satisfaction (Y) is positively and significantly influenced by both packaging design (X1) and product quality (X2), with a determination coefficient of 0.875, or 87.5%. The estimated values concurrently exceed the ftable limit (333.246 > 3.09) at a significance level of less than 0.05 (0.000 < 0.05).

Optimal Conversion of Food Packaging Waste to Liquid Fuel via Nonthermal Plasma Treatment: A Model-Centric Approach.

The efficiency of employing a multifactorial approach to enhance the nonthermal plasma (NTP) chemical conversion of solid waste food packaging materials into liquid petroleum hydrocarbons was assessed for the first time in this study. The researchers adopted a hybrid approach which integrated the zero-dimensional (0-D) and response surface model (RSM) techniques. After their application, the researchers noted that these strategies significantly enhanced the model prediction owing to their accurate electrochemical description. Here, the researchers solved a set of equations to identify the optimisation dynamics. They also established experimental circumstances to determine the quantitative correlation among all process variables contributing to food plastic packaging waste degradation and the production of liquid fuels. The findings of the study indicate a good agreement between the numerical and experimental values. It was also noted that the electrical variables of NTP significantly influenced the conversion yield (Yconv%) of solid plastic packaging waste to liquid hydrocarbons. Similarly, after analysing the data, it was seen that factors like the power discharge rate (x1 ), discharge interval (x2), power frequency (x3), and power intensity (x4) could significantly affect the product yield. After optimizing the variables, the researchers observed a maximal Yconv% of approximately 86%. The findings revealed that the proposed framework could effectively scale up the plasma synergistic pyrolysis technology for obtaining the highest Yconv% of solid packaging plastic wastes to produce an aromatics-enriched oil. The researchers subsequently employed the precision of the constructed framework to upgrade the laboratory-scale procedures to industrial-scale processes, which showed more than 95% efficiency. The extracted oil showed a calorific value of 43,570.5 J/g, indicating that the liquid hydrocarbons exhibited properties similar to commercial diesel.

Olive pomace upcycling: Eco-friendly production of cellulose nanofibers by enzymatic hydrolysis and application in starch films.

Olive pomace (OP) waste, produced in large quantities, contains significant amounts of cellulose and fibers, making it a valuable resource for developing reinforcing ingredients in biodegradable packaging materials. This study aimed to produce nanofibers from OP using enzymatic hydrolysis with hemicellulases and cellulases, and to incorporate these nanofibers into starch films as a reinforcing agent. Cellulose nanofibers (CNFs) were prepared by alkaline pretreatment followed by enzymatic hydrolysis (with hemicellulases and cellulases) from olive pomace and applied as reinforcement in starch films in concentrations of 0.5%-5% (w/v). The nanofibers were analyzed according to composition, structural, and thermal properties. The nanofibers' suspension presented a cloudy and white color in aqueous suspension, the X-ray diffraction (XRD) analysis showed the increase of crystallinity, and the fibers' range was no wider than 100nm (according to Scherer equation). The composition analysis showed the decrease of carbonyl groups of hemicellulose and lignin. The starch films presented a homogenous surface. The solubility from these biodegradable films significantly reduced after the incorporation of CNF, and the nanomaterial's presence improved the degradation temperature (from 310°C to 322°C) and the mechanical resistance because the tension of rupture increased from 3.79 to 6.21MPa. PRACTICAL APPLICATION: The utilization of waste from the olive pomace for cellulose nanofiber production holds promise, given the nanofibers' ability to readily integrate into various materials, including starches used in biodegradable film production. Within these matrices, nanofibers act as structure reinforcers and significantly reduce the solubility of films. Although biodegradable films ensure the shelf life, safety, and quality of food, their properties currently do not match those of traditional petroleum-based materials at an industrial scale, indicating a need for further enhancement.

Pengembangan Makanan Tradisional Apem Kesesi Menggunakan Metode Quality Function Deployment (QFD) dan Konsep Green Product Sebagai Upaya Meningkatkan Kualitas Produk

Apem kesesi is a traditional wet cake food in Pekalongan district. Apem kesesi cake has the problem of not being long-lasting, the packaging and appearance of the product is less attractive, less hygienic, impractical and the taste is not suitable for the younger generation. Therefore, it is necessary to develop apem kesesi products according to needs to improve product quality. Apem kesesi product development uses the quality faction deployment (QFD) method and the green product concept. Based on survey results, consumers want apem kesesi products that are hygienic, practical, unique, have attractive packaging and are durable. The main ingredient for making apem cake is rice flour. Add tapioca flour to give the apem cake a chewy texture, palm sugar to produce a distinctive taste and aroma, then vanilla to strengthen the taste, and sodium benzoate as a preservative. The product packaging design consists of primary packaging and secondary packaging. Based on validation tests and different tests, the results showed that the product design developed met consumer needs and was better than existing products.

The influence of storage conditions on the dynamics of physicochemical markers of champignon (Agaricus bisporus) quality

Agaricus bisporus are the most common cultivated mushrooms. Champignons are a source of chitin, glycogen and minerals, and also have attractive organoleptic properties. Physicochemical and organoleptic characteristics of fresh Agaricus bisporus undergo significant changes during storage due to moisture transpiration, respiration and oxidative processes. The purpose of this work was to study the influence of storage conditions of cultivated champignons with unstained cap epithelium on the dynamics of their physicochemical parameters, as well as its relationship with changes in organoleptic parameters. The mushrooms were stored in refrigerated chambers at a constant temperature of +2 °C and +6 °C in polypropylene trays placed in bags made of biaxially oriented polypropylene (BOPP) perforated film and polyethylene (PE) film without perforation. Under all storage conditions studied, the nature of the dynamics of physicochemical parameters was close to linear (with the exception of the humidity of fruiting bodies when stored in PE film) — the calculated values of the Pearson correlation coefficient ranged from 0.67 to 0.97. Using two-factor analysis of variance, the influence of both packaging material and storage temperature on the dynamics of soluble solids content and mushroom tissue density was confirmed. When stored in PE film without perforation, a more intense negative dynamics of these criteria was observed compared to storage in perforated BOPP film. The identified difference is explained by the fact that in packaging made of PE film without perforation, conditions for anaerobic respiration were formed by the end of storage — the oxygen content decreased from 20.5% to 1.5–2.5%, which also contributed to the activation of decay processes. With increasing storage temperature, a more intense change in physicochemical parameters was observed, which was associated with an increase in metabolic rate. The relationship between the dynamics of all studied physicochemical quality markers and the dynamics of sensory assessments (with the exception of the marker "content of soluble solids" when stored in a perforated BOPP film at a temperature of 2 °C) has been statistically confirmed. Based on the results of the studies, the applicability of the criteria “humidity of fruiting bodies”, “content of soluble dry substances” and “density of fungal tissue” as markers for assessing the quality of cultivated Agaricus bisporus was confirmed.

Poly(lactide)-Based Materials Modified with Biomolecules: A Review.

Poly(lactic acid) (PLA) is characterized by unique features, e.g., it is environmentally friendly, biocompatible, has good thermomechanical properties, and is readily available and biodegradable. Due to the increasing pollution of the environment, PLA is a promising alternative that can potentially replace petroleum-derived polymers. Different biodegradable polymers have numerous biomedical applications and are used as packaging materials. Because the pure form of PLA is delicate, brittle, and is characterized by a slow degradation rate and a low thermal resistance and crystallization rate, these disadvantages limit the range of applications of this polymer. However, the properties of PLA can be improved by chemical or physical modification, e.g., with biomolecules. The subject of this review is the modification of PLA properties with three classes of biomolecules: polysaccharides, proteins, and nucleic acids. A quite extensive description of the most promising strategies leading to improvement of the bioactivity of PLA, through modification with these biomolecules, is presented in this review. Thus, this article deals mainly with a presentation of the major developments and research results concerning PLA-based materials modified with different biomolecules (described in the world literature during the last decades), with a focus on such methods as blending, copolymerization, or composites fabrication. The biomedical and unique biological applications of PLA-based materials, especially modified with polysaccharides and proteins, are reviewed, taking into account the growing interest and great practical potential of these new biodegradable biomaterials.

Ag-Pd nanoalloy film with ultra-high thermal and electrochemical stability for power electronic packaging

Nano-Ag paste is a popular material in power electronic packaging, while its microstructure is unstable at high temperatures and suffers from electrochemical migration. In this work, Ag-Pd nanoalloy film has been prepared by the pulsed laser deposition, and been sintered at low temperature for packaging. The thermal stability is significantly improved at 300 ℃ when Ag is alloyed with Pd. The Pd addition significantly increased the diffusion activation energy of Ag atoms and reduced the diffusion coefficient. The Ag-Pd sintered layer exhibited a stable microstructure at 300 °C or even 500 °C, which indicated that Ag-Pd nanoalloy had the potential to serve at high temperatures. Ag-Pd nanoalloy will preferentially generate a PdO passivation film and cover the anode surface, thereby slowing down the dissolution of the Ag and improving its resistance to electrochemical migration. This work provides theoretical studies and insights into the applications of Ag-Pd nanoalloys in high-reliability power electronics.

Core-Shell Engineered Fillers Overcome the Electrical-Thermal Conductance Trade-Off.

The rapid development of modern electronic devices increasingly requires thermal management materials with controllable electrical properties, ranging from conductive and dielectric to insulating, to meet the needs of diverse applications. However, highly thermally conductive materials usually have a high electrical conductivity. Intrinsically highly thermally conductive, but electrically insulating materials are still limited to a few kinds of materials. To overcome the electrical-thermal conductance trade-off, here, we report a facile Pechini-based method to prepare multiple core (metal)/shell (metal oxide) engineered fillers, such as aluminum-oxide-coated and beryllium-oxide-coated Ag microspheres. In contrast to the previous in situ growth method which mainly focused on small-sized spheres with specific coating materials, our method combined with ultrafast joule heating treatment is more versatile and robust for varied-sized, especially large-sized core-shell fillers. Through size compounding, the as-synthesized core-shell-filled epoxy composites exhibit high isotropic thermal conductivity (∼3.8 W m-1 K-1) while maintaining high electrical resistivity (∼1012 Ω cm) and good flowability, showing better heat dissipation properties than commercial thermally conductive packaging materials. The successful preparation of these core-shell fillers endows thermally conductive composites with controlled electrical properties for emerging electronic package applications, as demonstrated in circuit board and battery thermal management.

Visible light-activated dye-sensitized TiO2 antibacterial film: A novel strategy for enhancing food safety and quality

Antibacterial packaging holds promise in addressing food spoilage by inactivating bacteria, but current antimicrobial packaging solutions face challenges like depletion of antibacterials and concerns of antibiotic abuse. In response to these limitations of existing packaging materials, we developed a novel antibacterial packaging film by incorporating titanium dioxide (TiO2)- tetra(4-carboxyphenyl) porphyrin (TcPP) conjugates into cellulose nanofibrils (CNF) films. Unlike conventional antimicrobial packaging, this film harnesses visible light energy to excite electrons from TcPP to TiO2, generating reactive oxygen species (ROS) that inactivate bacteria without relying on antibiotics. Results demonstrated that the film reduced 4.5, 4.6, 4.1, and 4.7-log Escherichia coli, Pseudomonas fluorescens, Leuconostoc lactis, and Listeria innocua, respectively, in phosphate-buffered saline within 72h under 6000 lux light (3.13mW/cm2). The antimicrobial efficacy decreased as the light intensity decreased. Notably, it retains significant antimicrobial properties even under an extremely low light intensity of 600 lux (0.60mW/cm2). The analysis also revealed that singlet oxygen and hydrogen peroxide are the major generated ROS from the film under light exposure. When applied to cucumbers, the film reduced E. coli by 3.5 logs after 48-hour light exposure. The designed photocatalytic antibacterial film represents a major advancement in sustainable food preservation, reducing food waste by extending the shelf life of fresh produce.

Development of Technologies for Processing Polypropylene Foil Waste and Their Use in the Production of Finished Products.

This work aims to assess the possibility of using packaging industry waste to modify polypropylene products (PPs). The products were made in the form of extruded foil and injected samples. The products were produced using regranulate made of polypropylene cast foil. Maleic anhydride-modified polypropylene (MAPP) and polyolefin elastomer (POE) with a glycidyl ester functional group were used to modify the polypropylene. The samples were produced based on 50% foil waste reground and 50% pure PP. The rheological properties of the blends were assessed using the melt mass flow rate (MFR) technique; thermal properties using the differential scanning calorimetry method (DSC). The products manufactured using the injection molding method were subjected to an analysis of mechanical properties, such as tensile strength and impact strength. Also, in the case of film samples, tensile strength was assessed. Color-change assessments with CIE L*a*b* were carried out for all materials. Injection-molded products based on recycled metallized cast foil showed favorable mechanical properties such as tensile strength (1 MAPP = 26.7 MPa; 2 MAPP = 27.1 MPa), which was higher than the original material (cPP = 20.7 MPa). Also, for the films produced from regrind, the tensile strength was at a level similar (1 MAPP = 24.6 MPa; 2 MAPP/POE = 25.1 MPa) to the films extruded from virgin materials (cPP = 24.9 MPa). The introduction of a POE additive to the blends resulted in increased impact strength (1 MAPP/POE = 31 kJ/mol; 2MAPP/POE = 18 kJ/mol; 3 MAPP/POE = 11 kJ/mol) in relation to unmodified samples (cPP = 7 kJ/mol). The introduction of a POE additive to the tested mixtures improved the impact strength of the injected products by almost 4 times for sample 1 MAPP/POE and 2.5 times for sample 2 MAPP/POE in comparison to virgin cPP. These studies confirmed that foil waste can be successfully used to modify polypropylene products shaped both in the injection and extrusion processes.

Perancangan Desain Kemasan Produk Kacang Goreng Renyah Panineungan

The Panineungan Crispy Fried Beans brand is the flagship product of the Panineungan company, which is a Small, Micro and Medium Enterprise (MSME) in Sukaraja Regency. These fried peanuts have the advantage of being peanuts that have various additional flavors, but the product is not supported by a packaging design which is considered to lack identity product information, but is only packaged in transparent plastic with a printed sticker label, so it has no appeal to consumers. The aim of designing the packaging for the Panineungan Crispy Fried Beans product is an effort to provide product identity and be able to show the product's image compared to other competitors. The design is carried out by displaying product packaging designs with images for middle and upper middle levels. It is hoped that the production of Panineungan Crispy Fried Beans packaging will be able to strengthen the product's identity as a typical regional souvenir of Sukabumi Regency in order to achieve quality Small Micro and Medium Enterprises (MSME) products.

Analytical microscopy techniques using coaxial and oblique illuminations to detect thin glass particulates generated from glass vials for parenteral drug products

Glass vials are the most widely used primary containers for the packaging of parenteral products due to their optical clarity, general inertness, and hermetic properties, but under certain circumstances, they can pose safety concerns. Most of these issues are related to the potential formation of glass particulates through delamination or precipitation, resulting from the chemical interaction between the drug product and the inner surface of the glass vial. Hence, it is imperative for pharmaceutical companies to conduct product-vial compatibility studies to determine the appropriate packaging/container closure system. To support this development activity, scientists need to develop analytical methods to detect subvisible glass particulates in parenteral products, along with the appropriate positive controls, to facilitate detection and identification. This paper outlines the utilization of coaxial/episcopic and oblique illumination microscopy, combined with spectroscopic techniques, to detect thin glass particulates generated from a modified procedure. It also showcases the importance of angle-dependent lighting in visualizing positive control samples containing thin glass particulates. The analytical microscopy techniques discussed in this paper can assist scientists in selecting suitable container closure systems for developing parenteral products.

Microplastics: Features of appearance, identification methods (subject review)

Polymer packaging materials have become firmly embedded in our way of life. They are used in the manufacture of household items, as well as in the pharmaceutical, chemical, and automotive industries. Production and application of polymer packaging are expanding rapidly encompassing various spheres of the industry. According to Plastics Europe Market Research Group (PEMRG), global plastics production reached 348 million tons in 2017 and is likely to reach 33 billion tons by 2050. At the same time, about 26 million tons of plastic waste are generated annually on the territory of the European Union (EU), of which only 30% is collected for recycling. Despite this, in many countries of the world, including Russia, more than 50% of polymer materials are disposed of at landfills, where under the influence of external environmental factors (temperature, humidity), their destruction occurs with the formation of huge quantities of micro- and nanoplastics. Most people do not consider the environmental problems associated with microplastics to be serious. However, many studies aimed at in-depth study of this problem have proved that micro- and nanoplastics have significant negative effects on terrestrial and marine animals, as well as on human health, whether directly or indirectly. The identification of microplastics in various model environments and living systems is usually based on the use of infrared spectroscopy and Raman spectrophotometry. Each of the methods has its advantages and disadvantages, mainly related to sample preparation to improve the accuracy of identification. This review is devoted to the problem of formation and identification of microplastics in various natural objects.

Development of antioxidant arabinoxylan-tea polyphenol composite films for enhanced preservation of fresh grapes

In this study, arabinoxylan (AX) was used as a substrate, and tea polyphenol (TP) as a functional additive to create degradable, non-polluting, and antioxidant packaging materials. The effects of different TP concentrations on light transmittance and antioxidant activity of the AX-TP composite films were analyzed. The colors of the films gradually deepened with increasing TP content. The maximum scavenging rate of 1,1-diphenyl-2-picrylhydrazyl (DPPH) free radicals using the AX-TP composite film solution of 59.13 ± 2.19 % was achieved at the TP concentration of 2.0 %. AX-TP composite films with different TP concentrations were applied to the surfaces of grapes, and the sensory quality, shriveling and decay rates, titratable acid, and weight loss rate of grapes during storage were evaluated using data from different experimental groups. The AX-TP composite films coated on grapes reduced the transpiration of water in the fruit and delayed grape spoilage, demonstrating an excellent preservation effect. These results show that AX-TP composite films increase the shelf life of fresh grapes.

Engineering designed functional covalent organic frameworks via pore surface modifications for effectively reducing the dielectric constant of polyimide-based electronic packaging materials

Polyimide (PI) is considered one of the most promising candidate materials for the microelectronics and wireless communication industries. Nevertheless, the relatively high dielectric constant of PI has become a significant obstacle, constraining its utilization in the realm of microelectronics. Herein, novel PI nanocomposite films were fabricated by incorporating covalent organic frameworks (COFs) and their functionalized counterparts (COF@POSS and COF@DTF) through post-synthetic modification. Among all PI nanocomposites films, PI/COF@POSS nanocomposite film including 2 wt% COF@POSS achieved the lowest dielectric constant (2.41) and dielectric loss (0.0076). These values represented a reduction of 22.5 % and 24 % compared to pure PI, respectively. The decrease in dielectric constant is ascribed to the combined influence of the porous structure of COF and the augmentation in free volume fraction caused by the steric hindrance of POSS. Additionally, the tensile strength of the PI/COF@POSS and PI/COF@DTF nanocomposite films increased up to 121.1 MPa and 112.0 MPa, representing a 95 % and 80 % improvement over pure PI, respectively. Furthermore, the introduction of COFs functionalized with POSS and DTF significantly enhanced the hydrophobicity of PI nanocomposite films. The combination of porous organic nanofillers with surface functionalization offers a feasible route to create low-k PI nanocomposite films with improved mechanical properties and hydrophobicity.