State of water in the pH-sensitive chitosan-polyether semi-IPN hydrogel
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چکیده
منابع مشابه
State of Water in Chitosan–PVA Hydrogel
The bound water fraction (XBW) of a newlydeveloped pH-sensitive, biodegradable chitosan-polyvinyl alcohol (PVA) hydrogel crosslinked with glutaraldehyde (GA) was investigated as a function of the chitosan/PVA molar ratio, GA concentration (CGA), and ionization state. Differential scanning calorimetry (DSC) was used to determine the XBW of the initial hydrogel, and of the hydrogel equilibrated i...
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Hydrogels, due to their unique potentials such as high-water content and hydrophilicity are interest for the controlled release of drug molecules. The present study aims to create a controlled-release system through the preparation and characterization of hydrogels based on pH-sensitive polymers such as poly (acrylic acid). Poly (acrylic acid), p(AA), hydrogel has been synthesized by radical po...
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Chitosan and poly(vinyl alcohol) (PVA) were used to form a semi-interpenetrating polymeric network with glutaraldehyde as the cross-linker. The molecular weight and degree of deacetylation of the chitosan were 612 kDa and 72 %, respectively. The chemical bonds formed by the cross-linking reaction and transition of these bonds in different pH media were investigated. The gelation property of the...
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pH-sensitive poly(acrylic acid) (PAA) hydrogel reinforced with cellulose nanocrystals (CNC) was prepared. Acrylic acid (AA) was subjected to chemical cross-linking using the cross-linking agent MBA (N,N-methylenebisacrylamide) with CNC entrapped in the PAA matrix. The quantity of CNC was varied between 0, 5, 10, 15, 20, and 25 wt %. X-ray diffraction (XRD) data showed an increase in crystallini...
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ژورنال
عنوان ژورنال: Journal of Applied Polymer Science
سال: 2003
ISSN: 0021-8995,1097-4628
DOI: 10.1002/app.1996.070610224