Fabrication of superabsorbent nanofibers based on sodium polyacrylate/poly(vinyl alcohol) and their water absorption characteristics

2019 ◽  
Vol 68 (4) ◽  
pp. 764-771 ◽  
Author(s):  
Sejin Choi ◽  
Hye Ri Kim ◽  
Han Seong Kim
Keyword(s):  
Water Absorption ◽  
Vinyl Alcohol ◽  
Poly Vinyl Alcohol ◽  
Sodium Polyacrylate ◽  
Absorption Characteristics

Mechanical and water absorption properties of poly(vinyl alcohol)/sago pith waste biocomposites

2011 ◽  
Vol 45 (11) ◽  
pp. 1201-1207 ◽  
Author(s):  
Toh Wen Yee ◽  
Lai Jau Choy ◽  
Wan Aizan Wan Abdul Rahman
Keyword(s):  
Water Absorption ◽  
Vinyl Alcohol ◽  
Interfacial Adhesion ◽  
Water Resistance ◽  
Poly Vinyl Alcohol ◽  
General Phenomenon ◽  
Absorption Properties ◽  
Study Variable ◽  
Sago Pith Waste ◽  
Restricted Mobility

A series of blends of sago pith waste (SPW) and poly(vinyl alcohol) (PVA) were prepared. Mechanical and water absorption properties of the composites have been investigated. In this study, variable amounts of plasticized SPW (pSPW) and PVA (pPVA) were processed in the presence of glycerol as plasticizers. Composites were compression molded and evaluated. The addition of pSPW reduced the tensile properties of the composites, lowering the elongation and increasing Young’s modulus. The reduction in mechanical strength with the addition of pSPW was a general phenomenon due to the poor interfacial adhesion between the pPVA and Pspw, which can be proved by the scanning electron microscope observations. The percentage of water absorbed of the pPVA/pSPW biocomposites was higher than either the pPVA or pSPW alone while pSPW showed better water resistance compared to pPVA because of the restricted mobility exerted by the cellulose fibers. The incorporation of SPW into PVA decreased both the mechanical and water absorption properties.

Characterization of cellulose nanocrystals extracted from El Diss and El Retma local plants and their dispersion in poly(vinyl alcohol-co-ethylene) matrix in the presence of borax

2020 ◽  
pp. 096739112091087
Author(s):  
Lilia Benchikh ◽  
Abdelhafid Merzouki ◽  
Yves Grohens ◽  
Melia Guessoum ◽  
Isabelle Pillin
Keyword(s):  
Water Absorption ◽  
North Africa ◽  
Cellulose Nanocrystals ◽  
Vinyl Alcohol ◽  
Poly Vinyl Alcohol ◽  
Scanning Calorimetry ◽  
The Matrix ◽  
Dsc Analyses ◽  
Local Plants

This study aims to investigate the potential of two local fibers, namely El Diss and El Retma, which are abundant in the mountains of North Africa (Sétif, Algeria), to provide cellulose nanocrystals (CNCs). Then, the isolated CNCs from El Diss were used as a reinforcement for a poly(vinyl alcohol-co-ethylene) matrix (EVOH) in the absence and in the presence of borax which was added to improve the interactions between the CNCs and the matrix. The extracted CNCs from both El Diss (CNCD) and El Retma (CNCR) were characterized by Zeta-sizer analysis using dynamic light scattering (DLS), Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), and scanning electronic microscopy. Also, untreated EVOH/CNCD nanocomposites and borax-treated EVOH/CNCD/BOR have been characterized using FTIR, differential scanning calorimetry (DSC) analyses, and by the study of their water absorption behavior. The DLS analysis provided the transversal length of the particles and showed that the surface of the obtained CNCs is negatively charged due to the presence of sulfated ions. Also, FTIR results confirmed the elimination of extra cellulosic substances, whereas TGA proved that the degradation of CNCs occurs at relatively lower temperatures compared with the neat fibers. The incorporation of borax to EVOH/CNCD nanocomposites showed its efficiency in improving the interactions at the interface between EVOH and the CNCD, which significantly affected the material’s thermal properties as concluded from DSC results and their water absorption behavior.

scholarly journals ACID CITRIC CROSS –LINKING OF STARCH/ POLY(VINYL ALCOHOL) BLEND

2011 ◽  
Vol 14 (4) ◽  
pp. 57-66
Author(s):  
Nguyen Thao Tran ◽  
Diem Thi Tuyet Nguyen ◽  
Tai Tan Dang
Keyword(s):  
Mechanical Properties ◽  
Citric Acid ◽  
Water Absorption ◽  
Vinyl Alcohol ◽  
Hydrophilic Polymers ◽  
Poly Vinyl Alcohol ◽  
Cross Linking ◽  
Biodegradable Materials ◽  
Starch Films

In recent times, a number of studies worldwide have focused on strengthening the interaction between the TPS and PVA or modifying with several agents to achieve better mechanical properties, in order to apply in the manufacturing of biodegradable materials. In addition, since both starch and PVA are hydrophilic polymers, they have very strong water absorption ability. In this research, the possibility of cross-linking starch films using citric acid to improve their strength and stability was examined. The study also showed the prospect to limit water absorption of the blend when solubility of the mixture can be reduced to 40%.

scholarly journals Effect of Sugar, Urea, and Molasses and the Influence of Radiation on the Plasticization of Acacia catechu Extract Incorporated Starch/Poly-(Vinyl Alcohol) Based Film

2013 ◽  
Vol 2013 ◽  
pp. 1-10
Author(s):  
Marufa Naznin ◽  
Md. Zainul Abedin
Keyword(s):  
Tensile Strength ◽  
Water Absorption ◽  
Vinyl Alcohol ◽  
Soil Degradation ◽  
Thermal Studies ◽  
Poly Vinyl Alcohol ◽  
A Value ◽  
Absorption Experiment ◽  
Degradation Test ◽  
Acacia Catechu

Acacia catechu extract was incorporated in the starch/PVA (60% : 40%) based films (0% to 15%) to the total weight of starch/PVA based film. The tensile strength (TS) of the starch/PVA blend film was 24 MPa whereas the acacia incorporated film shows the highest tensile strength (TS) of 33.8 MPa at 0.5%. Again, 0.5% acacia based film was treated with 10% urea, sugar, and molasses separately both at nonirradiated and irradiated conditions. At the nonirradiated condition molasses incorporated film gives the best results (TS 16 MPa, EB 59%), while sugar incorporated film shows a value of 10 MPa TS and EB of 123% at 200 krad. The films were investigated by FTIR. Thermal studies were carried out by TG/DTA. Water absorption experiment showed a different uptake of water by the different films. Soil degradation test revealed that after 70 days molasses incorporated film (both irradiated and nonirradiated) degrades to 100% into the soil.

scholarly journals RADIATION SYNTHESIS OF POLY(VINYL ALCOHOL) PVA–(POLYVINYL PYRROLIDONE) PVP FOR IMMOBILIZATION OF CAPTOPRIL

2020 ◽  
Vol 21 (4) ◽  
pp. 143
Author(s):  
Hariyanti Hariyanti ◽  
Erizal Erizal ◽  
M Yasin Yunus ◽  
Indah Lestari ◽  
Ditri Risska Rahmadhani
Keyword(s):  
Drug Release ◽  
Water Absorption ◽  
Gamma Rays ◽  
Vinyl Alcohol ◽  
Drug Dose ◽  
Poly Vinyl Alcohol ◽  
Radiation Synthesis ◽  
Control Drug ◽  
Gel Fraction ◽  
And Control

RADIATION SYNTHESIS OF PVA POLY(VINYL ALCOHOL)–PVP (POLYVINYLPYRROLIDONE) for IMMOBILIZATION OF CAPTOPRIL. The aim of this work is to prepare Polyvinyl alcohol (PVA)- Polyvinylpyrrolidone (PVP) hydrogel with varying irradiation doses and drug dose to be used as a matrix for immobilization and control drug release of captopril. Immobilization and release of captopril in PVA-PVP hydrogel copolymer have been carried out. A mixture of PVA-PVP (6:4 w/w) solution containing captopril (10-20 mg), freeze-thawing, irradiated using gamma rays at various irradiation doses (0-20 kGy). The gel fraction and water absorption were determined gravimetrically. The pores structure of hydrogels were observed using SEM (Scanning Electron Microscope). The captopril released from hydrogel in NaCl 0.9% solution was measured using a UV-Vis spectrophotometer. After evaluated, it was found that with increasing dose up to 20 kGy, the gel fraction increases, and water absorption decreases, and the cumulative drug released decreases. SEM measurement showed that hydrogel had heterogeneous pores. PVA-PVP hydrogel prepared using gamma rays can be considered as a matrix for drug release.

scholarly journals Processing and Characterization of Antibacterial Hydrogel Sheet Dressings Composed of Poly(vinyl alcohol) and Silk Fibroin for Wound Healing Application

2018 ◽  
Vol 16 (5) ◽  
pp. 349-359
Author(s):  
Pimpon UTTAYARAT ◽  
Rattanakorn CHIANGNOON ◽  
Jarurattana EAMSIRI ◽  
Wongwit SENAWONGSE
Keyword(s):  
Wound Healing ◽  
Gamma Irradiation ◽  
Water Absorption ◽  
Silk Fibroin ◽  
Vinyl Alcohol ◽  
The Body ◽  
Poly Vinyl Alcohol ◽  
High Water Content ◽  
Natural Polymers ◽  
Gel Fraction

Hydrogels are soft materials that contain high water content within their 3-dimensional structure. Such extremely hydrated environment allows hydrogels to recapitulate the structure of many native tissues inside the body. In biomedical application, hydrogels have been extensively used as biocompatible materials, drug delivery systems, and tissue-engineered scaffolds that can be designed to possess either permanent or slow-degradation properties. In this research, we applied gamma irradiation to develop transparent and conformal hydrogel sheets with sufficient mechanical strength from poly(vinyl alcohol) (PVA) and further modified the based PVA matrix with naturally-derived silk fibroin (SF) protein and silver nitrate (AgNO3) for wound healing purpose. The physical and mechanical properties of based PVA hydrogels formed at varied irradiation doses from 10 - 80 kGy were first characterized. The dose of 60 kGy was found to be optimal to process flexible and elastic PVA sheets with equilibrium degree of swelling of 1000 %, gel fraction of 90 %, and tensile strength of 19 kPa. To further enhance water absorption capacity, 10 - 40 % (w/w) silk fibroin was added to the based PVA matrix. Based on water absorption and gel fraction data, hydrogel sheets with 8PVA:2SF formulation was selected for antibacterial test. Disc diffusion assay showed that the incorporation of 0.4 mM AgNO3 in 8PVA:2SF hydrogel sheets could inhibit the growth of Staphyllococcus aureus and Pseudomonas aeruginosa. These results demonstrated that a prototypic, antibacterial hydrogel sheet dressing composed of both synthetic and natural polymers could be developed within a single-step by gamma irradiation technique.

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