Thermal and Mechanical Properties of Collagen/Poly (vinyl alcohol) and Chitosan/Poly (vinyl alcohol) Blends: Effect of Crosslinking with Glutaraldehyde.

Abstract

Collagen/poly (vinyl alcohol) (PVA) and chitosan/PVA blends were cast into films from mixed polymer solutions in aqueous acetic acid. Transition behavior of two series of binary blends was examined by DSC measurements. Composition-dependent shift in the glass transition temperature (Tg) of PVA was observed for chitosan/PVA blends and the melting point of PVA was depressed systematically with increasing chitosan content. On the other hand, the less significant shift in Tg of PVA was observed for collagen/PVA blends. These results suggest that the chitosan is compatible with PVA, while collagen is incompatible with PVA. An attempt was made to introduce crosslinks into both series of blends with the aid of glutaraldehyde. Enhancement of the compatibility was achieved for collagen/PVA blends and the mixing state was improved by the introduction of the crosslinking in consequence of the bridge formation between PVA and collagen molecules. On the other hand, chitosan/PVA blends lost their high compatibility due to the preferential crosslinking among chitosan chains. Elongation/contraction behavior of the crosslinked collagen/PVA blends during the alternate immersion in water and concentrated LiCI solution was examined. Further, the moduli of crosslinked collagen/PVA and chitosan/PVA blend hydrogels were also discussed in terms of the degree of crosslinking and the higher order structure of collagen in the hydrogel .

Enhancement in hydrolytic stability and proton conductivity of optimised chitosan/sulfonated poly(vinyl alcohol) composite membrane with inorganic fillers

“…Thus, this condition promotes low water uptake with a trade‐off in ionic conductivity due to the limited ion transport pathways. However, the results obtained by Miyashita et al 20 indicated the inclusion of GA towards chitosan/poly(vinyl alcohol) (PVA) blend. They explained that the good compatibility between chitosan and PVA strips the advantage of GA, where the addition stimulates the copolymerisation of chitosan and causes phase separation.…”

Preparation, characterization, and properties of chitosan‐g‐poly(vinyl alcohol) copolymer

“…Though some blends of PVA with chitosan have been prepared, [10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26] there are few reports about the chemical combination of chitosan and PVA. In this article, we developed a novel method to connect PVA macromonomers with a chitosan derivative [6-O-succinate-N-phthaloyl-chitosan (PHCSSA)] due to the reaction between OH groups from PVA and COOH groups from 6-O-succinate-N-phthaloyl-chitosan.…”