Abstract
Thermoreversible gel-sol transitions are investigated for aqueous solutions of blends of poly(N-vinylpyrrolidone) (PVPr) with poly(4-vinyphenol) (PVPh). It is found that aqueous solutions of PVPr-PVPh blends containing a small amount of PVPh form gels due to hydrogen-bonding between the hydroxyphenyl groups of PVPh and the carbonyl groups of PVPr. In addition, the gels show a thermoreversible gel-sol transition because of the thermoreversible nature of cross-links. The gel-sol transition temperature of the systems rises with increasing PVPh content in PVPr/PVPh blends and decreasing water/blends (w/w) ratio. The heat of fusion of PVPr-PVPh gels results in relatively small absolute values due to repulsion between PVPh and distilled water.
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