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Properties of blends of syndiotactic‐rich and atactic poly(vinyl alcohols)
Author(s) -
Matsuzawa Shuji,
Yamaura Kazuo,
Nagura Masanobu,
Fukuta Toyohiko
Publication year - 1988
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.1988.070350621
Subject(s) - crystallinity , materials science , tacticity , vinyl alcohol , polymer chemistry , solubility , annealing (glass) , polymer blend , mass fraction , swelling , fraction (chemistry) , chemical engineering , composite material , polymer , polymerization , organic chemistry , chemistry , copolymer , engineering
The crystallinity, solubility, degree of swelling, and hygroscopicity of the blends of syndiotactic‐rich (st‐PVA) and atactic poly(vinyl alcohols) (at‐PVA) were studied. The crystallinity of the blends increased with increasing annealing temperature and that of the blends annealed at 200°C was larger than that of at‐PVA. In the 200°C annealed blends containing st‐PVA about 50%, the insoluble fraction in boiling water was larger than the fraction of st‐PVA in each blend. The soluble fraction for the blend containing 75% st‐PVA was 1.7%. The moisture regain of the blends was less than that of at‐PVA.