scholarly journals Water absorption dependence of the formation of poly(vinyl alcohol)-iodine complexes for poly(vinyl alcohol) films

RSC Advances ◽  
2021 ◽  
Vol 11 (46) ◽  
pp. 28785-28796
Author(s):  
Yingxu Song ◽  
Sumei Zhang ◽  
Jian Kang ◽  
Jinyao Chen ◽  
Ya Cao
Keyword(s):  
Water Absorption ◽  
Vinyl Alcohol ◽  
Poly Vinyl Alcohol ◽  
Dyeing Process ◽  
Large Water ◽  
Iodine Complexes

Swelling process improves the mobility of PVA segments, while dyeing process restricts that. And there is a large water absorption dependence on the formation of PVA–iodine complexes.

Role of boric acid in the formation of poly(vinyl alcohol)–iodine complexes in undrawn films

Polymer ◽  
2010 ◽  
Vol 51 (3) ◽  
pp. 687-693 ◽  
Author(s):  
Kumiko Ohishi ◽  
Toshiaki Itadani ◽  
Tetsushi Hayashi ◽  
Toshio Nakai ◽  
Fumitaka Horii
Keyword(s):  
Boric Acid ◽  
Vinyl Alcohol ◽  
Poly Vinyl Alcohol ◽  
Iodine Complexes

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.

scholarly journals Novel Green Dyeing Process of Soybean Protein/Poly(vinyl alcohol) Blend Fibre

2015 ◽  
Vol 23 (5(113)) ◽  
pp. 55-59
Author(s):  
Jingchun Lv ◽  
Qingqing Zhou ◽  
Dawei Gao ◽  
Guoliang Liu ◽  
Chunxia Wang ◽  
...  
Keyword(s):  
Vinyl Alcohol ◽  
Soybean Protein ◽  
Poly Vinyl Alcohol ◽  
Dyeing Process

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%.

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