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Properties of mixtures of silk fibroin/syndiotactic‐rich poly(vinyl alcohol)
Author(s) -
Yamaura Kazuo,
Kuranuki Noriyasu,
Suzuki Miyako,
Tanigami Tetsuya,
Matsuzawa Shuji
Publication year - 1990
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/app.1990.070410941
Subject(s) - fibroin , vinyl alcohol , polymer chemistry , materials science , endothermic process , chemical engineering , swelling , silk , methanol , thermal decomposition , polyvinyl alcohol , tacticity , chemistry , composite material , polymer , organic chemistry , polymerization , adsorption , engineering
The gelation of mixed solutions of silk fibroin (SF)/syndiotactic‐rich poly(vinyl alcohol) ( s ‐PVA), the thermal analysis of dry‐gels, and the various properties of blend films were investigated. The rate of gelation of a mixed solution was lower than that of each SF or s ‐PVA solution of the same concentration. In the DSC thermograph of mixed dry‐gel (SF/ s ‐PVA = 2/8–8/2) 2 endothermic peaks corresponding to SF (at 288–299°C: decomposition) and s ‐PVA (at 233–241°C: melting) were found. Namely, microphase segregation took place. This was confirmed by optical and electron microscopes. The mechanical properties of blend films did not have additive properties. The degree of swelling in water of blend films was independent on water temperature or methanol treatment. The mechanochemical behaviors were barely observed by the pH exchange between pH 2 and 12 only under lower loads. The addition of SF into s ‐PVA films promoted the permeation of neutral salts.