Modified Poly Propylene Research Articles

Superhydrophobic fluorinated nanoparticle-modified surfaces for fast, efficient, and selective elimination of oil from water

An effective, low-cost method for fabricating superhydrophobic surfaces was investigated. A mixed solution of tetrahydrofuran, 2,3,4,5,6-pentafluorostyrene, and Al₂O₃ nanoparticles was introduced to the original materials to obtain superhydrophobic modified polypropylene (M-PP), cotton fiber (M-CTF), and polyurethane foam (M-PUF). The novelty of this work includes the development of cost-effective, stable materials with superhydrophobic surfaces for extreme water-repellency. The prepared materials were evaluated for hydrophobicity, oil absorption capacity, separation efficiency, oil flux, and reusability using several techniques. They all showed superhydrophobicity with water contact angles higher than 151 ± 0.5°. The results also reveal that the materials exhibited significant oil absorption capacities between 9.8 and 40.3 times their own weights, high separation efficiency (>97.2%), oil flux (>41,110 Lm⁻²h⁻¹), and reusability (>100 times) in the separation of oil-water. Moreover, all the treated materials demonstrated excellent oil selectivity in different salty waters. The samples could still retain outstanding separation even after 10 abrasion cycles with sandpapers. The excellent anti-intrusion and anti-abrasion behavior make the prepared materials promising for oil/water separation in harsh environments.

Mechanical, Hydrophobic, and Barrier Properties of Nanocomposites of Modified Polypropylene Reinforced with Low-Content Attapulgite.

Attapulgite (ATT) has never been used as a barrier additive in polypropylene (PP). As a filler, ATT should be added in high content to PP. However, that would result in increased costs. Moreover, the compatibility between ATT and the PP matrix is poor due to the lack of functional groups in PP. In this study, carboxylic groups were introduced to PP to form a modified polypropylene (MPP). ATT was purified, and a low content of it was added to MPP to prepare MPP/ATT nanocomposites. The analysis from FTIR indicated that ATT could react with MPP. According to the results of oxygen and water permeability tests, the barrier performance of the nanocomposite was optimal when the ATT content was 0.4%. This great improvement in barrier performance might be ascribed to the following three reasons: (1) The existence of ATT extended the penetration path of O2 or H2O molecules; (2) O2 or H2O molecules may be adsorbed and stored in the porous structure of ATT; (3) Most importantly, –COOH of MPP reacted with –OH on the surface of ATT, thereby the inner structure of the nanocomposite was denser, and it was less permeable to molecules. Therefore, nanocomposites prepared by adding ATT to MPP have excellent properties and low cost. They can be used as food packaging materials and for other related applications.

Fly Ash/Silica Fume Coral Concrete with Modified Polypropylene Fiber for Sustainable Building Construction

Coral concrete made of coral sand/aggregates has attracted significant interest in the construction of coastal or artificial island buildings by saving significant economic and environmental costs for transporting the conventional building materials from mainland. However, the application of coral concrete is very limited due to the drawback such as low strength, brittleness, and high porosity. This paper develops a new coral concrete composite utilizing coral debris to replace sand and aggregates, sea water, supplementary cementitious waste materials, namely, fly ash and silica fume and modified polypropylene fiber (MPPF) to achieve both sustainable and economic development needs in coastal and island building and construction. The mechanical and durability of the new coral concrete are evaluated and the synergistic effects of fly ash and silica fume on the performance of MPPF coral concrete are discussed. It has been found out that the addition of fly ash and silica fume in MPPF coral concrete can significantly improve the strengths and reduce the chloride diffusion of coral concrete. Compared with those from the specimens without fly ash and silica fume, the compressive, splitting tensile, flexural strengths of MPPF concrete with 10% fly ash and 10% silica fume are improved by 31%, 33%, and 58%, respectively. The new coral concrete composite would be an ideal building material solution for coastal and artificial island applications as most of the materials come from the local wastes.

Viability of Lacticaseibacillus paracasei in Ultrafiltered white brined cheese packaged in modified atmosphere and flexible multilayer films

In this study, two packaging materials, modified polypropylene (MPP) and polyethylene terephthalate/aluminum/ low-density polyethylene (PETFA-Al-LDPE) were studied under various atmospheric conditions: 100 % CO2, 70 % N2 - 30 % CO2, 80 % N2 - 20 % CO2 for packing probiotic ultrafiltered (UF) white brined cheese. pH, titratable acidity, moisture content, Lacticaseibacillus paracasei viability and overall acceptability were monitored within a 12- week period. The control samples were packaged in atmospheric air. Results revealed that samples packaged in PETFA-Al-LDPE with the combination of 70 % N2 - 30 % CO2 had the lowest pH, highest acidity and moisture content. The viability of Lacticaseibacillus paracasei was reported to be 4*106 CFU/g within 12 weeks. The highest and lowest overall acceptability was for the cheese packaged in 70% N2 - 30 % CO2 and the control sample, respectively.

A New Application of Hollow Nanosilica Added to Modified Polypropylene to Prepare Nanocomposite Films

Since the inception of research on hollow silica, the use of hollow nanosilica (HNS) as additives in barrier materials has not been reported. In this study, we evaluated the capacity of HNS as an additive in modified polypropylene (MPP). According to X-ray diffraction (XRD), the crystallinity, tensile strength, and thermal stability of MPP/HNS nanocomposite containing 0.1[Formula: see text]phr HNS approached maximum values. Moreover, the nanocomposite had the best performance in terms of water vapor barrier and oxygen resistance. The reasons for the improvement in barrier performance were discussed. Scanning electron microscopy revealed that HNS at a low content dispersed well in MPP. In conclusion, the synthesized HNS can be used as an additive in barrier materials, and it would have potential applications in the fields of food packaging films and storage containers or materials.

A prepared easily bio-carrier based on chitosan modified polypropylene fibers

Abstract Bio-carriers play significant roles in microbial treatment technology. Fiber-based bacterial carriers have many advantages than others for larger specific surface area and better structural designability and polypropylene (PP) fibers show better service performance in harsh environments. To increase the number of bacteria loaded, a modification was applied in this study to provide PP fibers with positive charged film by coating chitosan. The modified PP (MPP) fibers showed better bio-affinity than other fibers. The number of bacteria fixed on MPP exceeded 10 times than that on PP, and modification gives PP fibers chelating cation function. It is certain that MPP could be good candidate for bio-carrier.

Performance Parameter Analysis of Power Cable Modified Polypropylene (MPP) Conduit

Modified polypropylene (MPP) conduits are increasingly used as protection conduits for trenchless power cables. In order to ensure the performance and quality of MPP conduits used in the field of power cables, this article has carried out research on its performance parameters and test methods. First of all, in view of the problem of excessive deviation of the MPP conduits appearance and size inspection, the relationship between the conduits wall thickness and the mechanical performance ring stiffness parameter was studied. Then, through the MPP conduits density, ring stiffness, Vicat softening temperature, and flattening test results, the correlation between the three parameters of density, ring stiffness, and Vicat softening temperature is analyzed. It also concluded that the ring stiffness and Vicat softening temperature have a moderate positive correlation. Finally, the article compares some similarities and differences between the MPP conduit and the CPVC conduit for two power cable protection conduits in terms of performance parameter test items.

Experimental Study on Ring Stiffness of Cable Conduit

Ring stiffness is an important factor in the construction and design of buried cable conduit, which determines whether the pipe can resist external forces for a long time. This paper focuses on the experimental study of the ring stiffness of cable conduit. The ring stiffness tests of chlorinated polyvinyl chloride (CPVC) and modified polypropylene (MPP) under different conditions are carried out to verify the influence of thickness and temperature on the ring stiffness of pipe. The test results show that both thickness and temperature have a significant effect on the ring stiffness of pipe. At the same time, the influence of temperature on the ring stiffness of different materials is different, and the possible reasons are analyzed. The conclusion of the experiment has guiding significance for the quality inspection and practical application of cable conduit.

Strength characteristics of modified polypropylene fiber and cement-reinforced loess

The reinforcement and stabilization of loess soil are duscussed by using fibers as the reinforcement and cement as the stabilization materials. To study the strength characteristics of loess soil reinforced by modified polypropylene (MPP) fiber and cement, samples were prepared with six different fiber contents, three different cement contents, three different curing periods and three kinds of fiber length. The samples were tested under submergence and non-submergence conditions for the unconfined compressive strength (UCS), the splitting tensile strength and the compressive resilient modulus. The results indicated that combined reinforcement by PP fiber and cement could significantly improve the early strength of loess to 3.65–5.99 MPa in three days. With an increase in cement content, the specimens exhibited brittle fracture. However, the addition of fibers gradually modified the mode of fracture from brittle to ductile to plastic. The optimal dosage of fiber to reinforce loess was in the range of 0.3%–0.45% and the optimum fiber length was 12 mm, for which the unconfined compressive strength and tensile strength reached their maxima. Based on the analysis of failure properties, cement-reinforced loess specimens were susceptible to brittle damage under pressure, and the effect of modified polypropylene fiber as the connecting “bridge” could help the specimens achieve a satisfactory level of ductility when under pressure.

Coagent Modified Polypropylene Prepared by Reactive Extrusion: A New Look into the Structure-Property Relations of Injection Molded Parts

AbstractPeroxide-mediated reactive extrusion of linear isotactic polypropylene (L-PP) was conducted in the presence of trimethylolpropane trimethacrylate (TMPTMA) and triallyl trimesate (TAM) coagents, using a twin screw extruder. The resulting coagent-modified polypropylenes (CM-PP) had higher viscosities and elasticities, as well as increased crystallization temperature compared to PP reacted only with peroxide (DCP-PP). Additionally, deviations from terminal flow, and strain hardening were observed in PP modified with TAM, signifying the presence of long chain branching (LCB). The CM-PP formulations retained the modulus and tensile strength of the parent L-PP, in spite of their lower molar mass and viscosities, whereas their elongation at break and the impact strength were better. This was attributed to the finer spherulitic structure of these materials, and to the disappearance of the skin-core layer in the injection molded specimens.

Synthesis of Polyolefin-g-Poly(ethylene oxide) by Reacting Maleic Anhydride Modified Polypropylene or Poly(propylene-co-ethylene) with Hydroxy-terminated Poly(ethylene Oxide) in the Melt

The synthesis of amphipolar graft copolymers by reactive extrusion of maleic anhydride modified polypropylene or poly(propylene-co-ethylene) and α, ω-dihydroxy-poly(ethylene oxide) or α-hydro-ω-oxymethyl-poly(oxyethylene) was studied. The graft copolymers were characterized by Fourier transform infrared spectroscopy. Residence time of 30 min at 160°C was established to be sufficient for graft copolymer formation by melt extrusion.

The Effects of Recycled Acrylonitrile Butadiene Rubber Content and Maleic Anhydride Modified Polypropylene (PPMAH) on the Mixing, Tensile Properties, Swelling Percentage and Morphology of Polypropylene/Recycled Acrylonitrile Butadiene Rubber/Rice Husk Powder (PP/NBRr/RHP) Composites

The effect of recycled acylonitrile butadiene rubber (NBRr) content and PPMAH as a compatibilizer on the properties of PP/NBRr/RHP composites were examined using a Haake Rheomix at 180°C, 60 rpm for 9 min. Results showed that higher stabilization torque, Young's modulus and tensile strength were obtained for PPMAH compatibilized composite as compared to uncompatibilized composites. However, for elongation at break (Eb) and swelling percentage of compatibilized composites exhibited lower values than uncompatibilized composites. The increase of NBRr content in both compatibilized and uncompatibilized composites resulted in higher stabilization torques, swelling percentage and elongation at break but lower tensile strength and Young modulus. Tensile fractured surfaces observed by scanning electron microscopy showed good adhesion between NBRr and PP matrix and better dispersion of RHP for the compatibilized composites.

Application of Surface Modified Polypropylene Membranes to an Anaerobic Membrane Bioreactor

In order to increase hydrophilicity and thereby to reduce membrane fouling caused by hydrophobic adsorption, the surface of a hydrophobic 0.2 µm polypropylene (PP) membrane was modified by ozone treatment followed by graft polymerization with 2-hydroxy-ethyl methacrylate (HEMA). The modified PP (MPP) membranes were characterized in terms of contact angle, morphology and degree of grafting (DG). The contact angle was reduced from 112° for a PP membrane to nearly 0° for MPP membranes by introducing functional groups such as hydroxyl (-OH) and carbonyl groups (C=O) on the membrane surface. As the DG increased, the O/C ratio and membrane resistance of the MPP membrane increased. Using the MPP membrane in the crossflow operation of an anaerobic membrane bioreactor (MBR), the membrane permeability was enhanced although it was largely dependent on the DG of MPP.

Maleic Anhydride Modified Polypropylene with Controllable Molecular Structure: New Synthetic Route via Borane-Terminated Polypropylene

ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTMaleic Anhydride Modified Polypropylene with Controllable Molecular Structure: New Synthetic Route via Borane-Terminated PolypropyleneBing Lu and T. C. ChungView Author Information Department of Materials Science and Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802 Cite this: Macromolecules 1998, 31, 17, 5943–5946Publication Date (Web):August 6, 1998Publication History Received24 March 1998Revised27 May 1998Published online6 August 1998Published inissue 1 August 1998https://doi.org/10.1021/ma9804693Copyright © 1998 American Chemical SocietyRIGHTS & PERMISSIONSArticle Views762Altmetric-Citations67LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InReddit Read OnlinePDF (138 KB) Get e-AlertsSUBJECTS:Amides,Copolymers,Polymers,Styrenes,Thermoresponsive polymers Get e-Alerts

Mechanical Properties of Blends of Nylon 6 with Chemically Modified Polypropylene

Abstract Melt blending of nylon 6 with chemically modified polypropylene (MPP) is carried out with a single-screw extruder over the whole range of compositions. The tensile, flexural, and impact properties are measured for the blend system. It is found that the MPP used as the second component has a profound effect upon the properties of the resulting blends. The addition of MPP decreases the tensile strength and flexural modulus whereas tensile modulus and flexural strength go through a minimum at the intermediate compositions. An improvement in impact strength is obtained only when nylon 6 is the basic resin and MPP is used as an additive. Microstructures of polyblends are studied by scanning electron microscopy.