Polyvinylpyrrolidone Carboxymethylcellulose Research Articles

Polyvinyl pyrrolidone/ carboxymethyl cellulose (PVP/CMC) polymer composites containing CuO nanoparticles synthesized via laser ablation in liquids

Polyvinyl pyrrolidone/carboxymethyl cellulose (PVP/CMC) polymer composites containing CuO nanoparticles synthesized via laser ablation in liquids were prepared. Fourier transform infrared (FTIR) spectroscopy, UV/Vis spectroscopy, and scanning electron microscopy (SEM) were used to characterize the structural, optical, and morphological properties of the polymer composites. The addition of CuO nanoparticles resulted in changes in the FTIR spectra, indicating interaction between the polymer matrix and nanoparticles. UV/Vis spectroscopy showed a red shift in absorption and a decrease in optical bandgap with increasing CuO nanoparticle content. SEM micrographs revealed increases in surface roughness with higher CuO nanoparticle loading. Antibacterial activity of the composites against Gram-positive and Gram-negative bacteria increased with greater CuO nanoparticle concentration. The results suggest these biofilms have potential for use as coating materials in biomedical applications.

Bacterial cellulose and guar gum based modified PVP-CMC hydrogel films: Characterized for packaging fresh berries

Abstract Nowadays, pollution caused by the excessive use of non-biodegradable plastic food packaging material is a serious environmental concern. Thus the objective of the present study was to evaluate bacterial cellulose and guar gum (BC-GG) based polyvinyl pyrrolidone – carboxymethyl cellulose (PVP-CMC) hydrogel film as an alternative food packaging material. Incorporation of GG to PVP-CMC-BC film was done to increase its mechanical and barrier properties. Films made with a different combination of GG and BC are evaluated based on their mechanical, structural, bioadhesive, colour, gloss, rheological, surface hydrophobicity, permeability, water-solubility, biodegradability and shelf life-enhancing properties of berries (e.g. blueberries). The results show the improvement in elastic and load-bearing capacity of the PVP-CMC-BC films with the incorporation of GG. Moreover, PVP-CMC-BC-GG films have better barrier and hydrophobic properties than the other three films used in this study. All the films are 80% biodegradable in 28 days in vermicompost. Thus, PVP-CMC-BC-GG film can be considered as an alternative biodegradable food packaging material.

Nanosecond laser-irradiation assisted the improvement of structural, optical and thermal properties of polyvinyl pyrrolidone/carboxymethyl cellulose blend filled with gold nanoparticles

Gold nanoparticles (Au NPs) supported within the polymeric matrix of polyvinyl pyrrolidone/carboxymethyl cellulose (PVP/CMC) were successfully prepared through the novel in situ method. These (PVP/CMC)/Au hybrid nanocomposites were exposed to nanosecond laser-irradiation with different powers. These nanocomposite samples were investigated before and after the irradiation process through various techniques such as X-ray diffraction analysis (XRD), Fourier transform infrared spectroscopy (FT-IR), ultraviolet/visible spectroscopy (UV/Vis), transmission electron microscope (TEM), differential thermal analysis (DTA) and thermogravimetric analysis (TGA) techniques. The XRD analysis depicted the amorphous nature for PVP/CMC blend and showed the characterizing peaks of Au NPs for the nanocomposite spectrum, where the intensity of these peaks was largely decreased after irradiation process. The FT-IR spectra showed that the blend components were miscible via showing the functional groups of two polymers that were interacted through the formation of a hydrogen bond and the FT-IR spectra of nanocomposite and irradiated samples were affected. Also, the mechanism of interactions between blend and Au NPs was proposed. The UV/Vis. spectra depicted the formation of Au NPs within the PVP/CMC matrix through showing the surface plasmon resonance peak (SPR) of Au NPs at 546 nm. The UV/Vis. the absorbance of this peak was increased and its position was red-shifted after the irradiation process implying the formation of smaller NPs and the narrow size distribution as confirmed by TEM micrographs. The thermal properties for prepared samples were determined through DTA and TGA techniques.

Novel High Gamma Radiation Shielding Nanocomposites of Polyvinyl Pyrrolidone-Carboxymethyl Cellulose Blend Dispersed with ZnO Nanoparticles for Radiation Sensor

Novel High Gamma Radiation Shielding Nanocomposites of Polyvinyl Pyrrolidone-Carboxymethyl Cellulose Blend Dispersed with ZnO Nanoparticles for Radiation Sensor

Influence of temperature, pH and simulated biological solutions on swelling and structural properties of biomineralized (CaCO3) PVP-CMC hydrogel.

Biomaterials having stimuli response are interesting in the biomedical field. This paper reports about swelling response and internal structural of biomineralized (CaCO3) polyvinylpyrrolidone (PVP) carboxymethylcellulose (CMC) hydrogel having various thicknesses (0.1–0.4 mm). Samples were tested in aqueous solution using temperature ranges from 10 to 40 °C; pH varies from 4 to 9, time 60 min. In addition, an experiment was conducted in the presence of simulated biological solutions (SBS): glucose (GS), physiological fluid (PS) and urea (US) at temperature 37 °C and pH 7.5 for 180 min. It is noticed that the maximum swelling ratio reached in 30–40 °C at pH 7 in aqueous solution. Among biological fluids, the swelling ratio shows: US > PS > GS at temperature 37 °C, pH 7.5, time 150 min. The equilibrium swelling ratio of the test sample in SBS and their non-reformative apparent structure confirm that biomineralized (CaCO3) PVP–CMC hydrogel can be acclaimed for medical application like bone tissue engineering.Graphical

Preparation of CaCO3‐based biomineralized polyvinylpyrrolidone–carboxymethylcellulose hydrogels and their viscoelastic behavior

AbstractIn the blend of natural and synthetic polymer‐based biomaterial of polyvinylpyrrolidone (PVP) and carboxymethylcellulose (CMC), fabrication of CaCO3 was successfully accomplished using simple liquid diffusion technique. The present study emphasizes the biomimetic mineralization in PVP–CMC hydrogel, and furthermore, several properties of this regenerated and functionalized hydrogel membranes were investigated. The physical properties were studied and confirmed the presence of CaCO3 mineral in hydrogel by Fourier transform infrared spectroscopy and Scanning electron microscopy. Moreover, the absorptivity of water and mineral by PVP–CMC hydrogel was studied to determine its absorption capacity. Further, the viscoelastic properties (storage modulus, loss modulus, and complex viscosity) of mineralized and swelled samples (time: 5–150 min) were measured against angular frequency. It is interesting to know the increase of elastic nature of mineralized hydrogel filled with CaCO3 maintaining the correlation between elastic property and viscous one of pure hydrogel. All these properties of biomineralized hydrogel suggest its application in biomedical field, like bone treatment, bone tissue regeneration, dental plaque and tissue replacement, etc. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 40237.

Biodegradation of PVP–CMC hydrogel film: A useful food packaging material

Hydrogels can offer new opportunities for the design of efficient packaging materials with desirable properties (i.e. durability, biodegradability and mechanical strength). It is a promising and emerging concept, as most of the biopolymer based hydrogels are supposed to be biodegradable, they can be considered as alternative eco-friendly packaging materials. This article reports about synthetic (polyvinylpyrrolidone (PVP)) and biopolymer (carboxymethyl cellulose (CMC)) based a novel hydrogel film and its nature of biodegradability under controlled environmental condition. The dry hydrogel films were prepared by solution casting method and designated as ‘PVP–CMC hydrogel films’. The hydrogel film containing PVP and CMC in a ratio of 20:80 shows best mechanical properties among all the test samples (i.e. 10:90, 20:80, 50:50, 80:20 and 90:10). Thus, PVP–CMC hydrogel film of 20:80 was considered as a useful food packaging material and further experiments were carried out with this particular hydrogel film. Biodegradation of the PVP–CMC hydrogel films were studied in liquid state (Czapec-Dox liquid medium+soil extracts) until 8 weeks. Variation in mechanical, viscoelastic properties and weight loss of the hydrogel films with time provide the direct evidence of biodegradation of the hydrogels. About 38% weight loss was observed within 8 weeks. FTIR spectra of the hydrogel films (before and after biodegradation) show shifts of the peaks and also change in the peak intensities, which refer to the physico-chemical change in the hydrogel structure and SEM views of the hydrogels show how internal structure of the PVP–CMC film changes in the course of biodegradation.