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Gelation of poly(vinyl alcohol)/water/dimethylformamide solutions and properties of dried films
Author(s) -
Yamaura Kazuo,
Ideguchi Shigeki,
Tanigami Tetsuya
Publication year - 1998
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(19981128)70:9<1661::aid-app3>3.0.co;2-t
Subject(s) - vinyl alcohol , amorphous solid , materials science , polymer , ultimate tensile strength , dimethylformamide , dissolution , polymer chemistry , solubility , chemical engineering , composite material , chemistry , organic chemistry , solvent , engineering
The properties of solutions for syndiotacticity‐rich poly(vinyl alcohol) ( s ‐PVA)/dimethylformamide (DMF)/water systems, the gelation of the s ‐PVA solutions, and the properties of the dried s ‐PVA gel films were examined. From the results of the dissolution temperature of the polymer, the gelation temperature of the solutions, the melting temperature of the gels, and the compressive modulus of the gels, the solubility of the polymer was the highest at DMF contents of 10–20 vol %. The maximum dynamic tensile modulus of the drawn (×18) films obtained from the dried gel films with a DMF content of 10 vol % was 54.9 GPa at 20°C. The orientation of the polymer chains in the amorphous regions was higher than that in the crystalline regions. The orientation of the polymer chains in the amorphous regions for the drawn films with a DMF content of 10 vol % was higher than that for the drawn films with a DMF content of 60 vol %. The orientation of the polymer chains in the amorphous regions was considered to play an important role in the properties of high strength and high modulus. © 1998 John Wiley & Sons, Inc. J Appl Polym Sci 70: 1661–1667, 1998