scholarly journals Structural Organization of Poly(vinyl alcohol) Hydrogels Obtained by Freezing and Thawing Techniques:  A SANS Study

2005 ◽  
Vol 17 (5) ◽  
pp. 1183-1189 ◽  
Author(s):  
Rosa Ricciardi ◽  
Gaetano Mangiapia ◽  
Fabrizio Lo Celso ◽  
Luigi Paduano ◽  
Roberto Triolo ◽  
...  
Keyword(s):  
Vinyl Alcohol ◽  
Structural Organization ◽  
Poly Vinyl Alcohol ◽  
Freezing And Thawing

Reinforcement with cellulose nanocrystals of poly(vinyl alcohol) hydrogels prepared by cyclic freezing and thawing

Soft Matter ◽  
2011 ◽  
Vol 7 (6) ◽  
pp. 2373 ◽  
Author(s):  
Tiffany Abitbol ◽  
Timothy Johnstone ◽  
Thomas M. Quinn ◽  
Derek G. Gray
Keyword(s):  
Cellulose Nanocrystals ◽  
Vinyl Alcohol ◽  
Poly Vinyl Alcohol ◽  
Freezing And Thawing

Gel permeation chromatographic properties of poly(vinyl alcohol) gel particles prepared by freezing and thawing

1994 ◽  
Vol 678 (1) ◽  
pp. 180-182 ◽  
Author(s):  
Ryoichi Murakami ◽  
Hiroshi Hachisako ◽  
Kimiho Yamada ◽  
Yoshiaki Motozato
Keyword(s):  
Vinyl Alcohol ◽  
Poly Vinyl Alcohol ◽  
Freezing And Thawing ◽  
Gel Particles ◽  
Gel Permeation

Novel Preparation of Poly(Vinyl Alcohol) Microparticles without Crosslinking Agent for Controlled Drug Delivery

1993 ◽  
Vol 331 ◽  
Author(s):  
Becky J. Ficek ◽  
Nicholas A. Peppas
Keyword(s):  
Vinyl Alcohol ◽  
Corn Oil ◽  
Crosslinking Agent ◽  
Degree Of Crystallinity ◽  
Poly Vinyl Alcohol ◽  
Release Mechanism ◽  
Lauryl Sulfate ◽  
Freezing And Thawing ◽  
Scanning Calorimetry ◽  
Thawing Process

AbstractPoly(vinyl alcohol) microparticles were prepared by a novel freezing-thawing process in the absence of a crosslinking agent. An aqueous PVA solution to which 1.25 wt% sodium lauryl sulfate was added was dispersed in corn oil. The system was agitated and the ensuing suspended droplets of PVA solution were solidified by a cyclic freezing-thawing process. Key parameters of the process were the PVA to corn oil ratio, the amount of surfactant added, agitation speed, number of freeze cycles, temperatures of freezing and thawing, and presence of additional components.Crystallization was observed during the freezing-thawing process. The degree of crystallinity was measured with differential scanning calorimetry. Bovine serum albumin was incorporated into the particles by an absorption technique. Studies of BSA release from the microparticles in vitro showed that the release could be prolonged for up to 7 days. BSA diffusion coefficients were calculated from these data and the release mechanism was identified.

Study of Physical Properties of Poly(vinyl alcohol) - Collagen Hydrogels Using a Response Surface Methodology

2013 ◽  
Vol 710 ◽  
pp. 60-66
Author(s):  
Yang Hu ◽  
Hai Lin ◽  
Lan Liu ◽  
Wei Hua Dan
Keyword(s):  
Response Surface Methodology ◽  
Physical Properties ◽  
Response Surface ◽  
Vinyl Alcohol ◽  
Covalent Bond ◽  
Chloroacetic Acid ◽  
Poly Vinyl Alcohol ◽  
Freezing And Thawing ◽  
Collagen Hydrogel ◽  
Collagen Hydrogels

A novel covalent bond cross-linked poly (vinyl alcohol) (PVA) collagen hydrogel was prepared and the physical properties were studied. The carboxyl groups were introduced into PVA through the reaction with chloroacetic acid. The EDC and NHS were used as cross-linker. The hydrogels were prepared by repeated freezing and thawing. For a better understanding of the influence of the parameters and their interaction, three factors were investigated by a response surface methodology. The physical properties of the hydrogels were analyzed. The results indicated that the response surface models could significantly fit the response values. Moreover, comparing with the single factor, the interactions between factors had more obvious effects to the physical properties of PVA-Collagen hydrogels. After the analysis of factors influences and investigation of the data and trends, the structure of the hydrogels might be the driving force of the different physical behaviors.

Gel–sol transition of poly(vinyl alcohol) hydrogels formed by freezing and thawing

2005 ◽  
Vol 431 (1-2) ◽  
pp. 144-148 ◽  
Author(s):  
Tatsuko Hatakeyema ◽  
Junko Uno ◽  
Chika Yamada ◽  
Akira Kishi ◽  
Hyoe Hatakeyama
Keyword(s):  
Vinyl Alcohol ◽  
Poly Vinyl Alcohol ◽  
Freezing And Thawing
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