The melting behaviors of hydrogels of syndiotacticity-rich poly(viny1 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 -40Β°C, the
Effect of thermal hysteresis on melting of syndiotacticity-rich poly(vinyl alcohol) hydrogel
β Scribed by Kazuo Yamaura; Tatsuya Takahasi; Tetsuya Tanigami; Shuji Matsuzawa
- Publisher
- John Wiley and Sons
- Year
- 1987
- Tongue
- English
- Weight
- 386 KB
- Volume
- 33
- Category
- Article
- ISSN
- 0021-8995
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The crystallinity, solubility, degree of swelling, and hygroscopicity of the blends of syndiotactic-rich (st-PVA) and atactic poly(viny1 alcohols) (at-PVA) were studied. The crystallinity of the blends increased with increasing annealing temperature and that of the blends annealed at 200Β°C was large
The extent of colour development in an aqueous poly(vinyl alcohol) (PVA)Γiodine complex solution increased with increasing syndiotacticity up to a certain syndiotactic content, then decreased with increasing syndiotacticity. The complex formation depended on the content of the syndiotactic pentad se