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Melting, regelling, and remelting of poly(vinyl alcohol) hydrogels
Author(s) -
Yamaura Kazuo,
Kurose Ikuo,
Tanigami Tetsuya
Publication year - 1996
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/(sici)1097-4628(19960509)60:6<897::aid-app13>3.0.co;2-u
Subject(s) - vinyl alcohol , self healing hydrogels , materials science , exothermic reaction , polymer chemistry , melting temperature , polymer , chemical engineering , spinodal decomposition , melting point , phase (matter) , spinodal , miscibility , composite material , chemistry , organic chemistry , engineering
The melting behaviors of hydrogels of syndiotacticity‐rich poly(vinyl alcohol) ( s ‐PVA), derived from vinyl trifluoroacetate, during heating at various rates of rising temperature were examined. For the hydrogels with the polymer concentrations above 5 g/dL chilled at the temperatures of 0 ∼ 40°C, the melting temperature increased with a decrease in the rate of rising temperature. During rising temperature at lower rates, the phase separation with spinodal decomposition progressed even in gels and the microcrystals, which play an important role as the junction points, propagated to thermally more stable size. The small, broad exothermic peaks during rising temperature of s ‐PVA hydrogels in DSC thermograms was found at the temperature ranges of 10 ∼ 30 and 45 ∼ 60°C. © 1996 John Wiley & Sons, Inc.