High molecular weight syndiotacticity-rich poly(vinyl alcohol) gel in aging process

被引:14
作者
Choi, JH
Lyoo, WS
Ghim, HD
Ko, SW [1 ]
机构
[1] Seoul Natl Univ, Coll Engn, Dept Fiber & Polymer Sci, Seoul 151742, South Korea
[2] Yeungnam Univ, Sch Text, Kyongsan 712749, South Korea
关键词
aging; poly(vinyl alcohol); gel; syndiotacticity; high molecular weight;
D O I
10.1007/s003960000387
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The properties of the aged gels of high molecular weight syndiotacticity-rich poly(vinyl alcohol)s (HMW S-PVAs) with different syndiotactic diad (s-diad) contents were investigated. HMW S-PVA gels with s-diad content of 61.5% and 58.2% showed the rapid increases of the syneresis and the turbidity from the early stage of aging time, which is ascribable to the phase separation, while that with s-diad content of 55.7% did not. From the morphological study, it was confirmed that the phase separation in HMW S-PVA gel with s-diad content of 61.5% occurred without the liquid-liquid phase separation in sol state, whereas both the liquid-liquid phase separation in sol state and the subsequent phase separation in gel state occurred in the case of HMW S-PVA gel with s-diad content of 58.2%. On the other hand, HMW S-PVA gel with s-diad content of 55.7% showed neither the liquid-liquid phase separation in sol state nor the phase separation in gel state in the long period of time. Tt was also confirmed from wide angle X-ray diffractogram that the crystallization was accompanied by the phase separation in gel state in the aging process of PVA gel. However, the crystallization was hindered by the fast network formation at the initial stage of time. Later the syndiotacticity promoted the crystallization. The tensile modulus of HMW S-PVA gel with higher syndiotacticity increased more significantly with time.
引用
收藏
页码:1198 / 1204
页数:7
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