LOCAL CHAIN MOTION OF ISOTACTIC AND SYNDIOTACTIC POLY(METHYL METHACRYLATE)S STUDIED BY THE FLUORESCENCE DEPOLARIZATION METHOD

被引：15

作者：

ONO, K ^{[1
]}

SASAKI, T ^{[1
]}

YAMAMOTO, M ^{[1
]}

YAMASAKI, Y ^{[1
]}

UTE, K ^{[1
]}

HATADA, K ^{[1
]}

机构：

[1] OSAKA UNIV,FAC ENGN SCI,DEPT CHEM,TOYONAKA,OSAKA 560,JAPAN

来源：

MACROMOLECULES | 1995年 / 28卷 / 14期

关键词：

D O I：

10.1021/ma00118a033

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

The local chain motion of syndiotactic and isotactic poly(methyl methacrylate)s (s-PMMA and i-PMMA) was examined by the time-resolved fluorescence depolarization method. The reduced relaxation time, T-m/eta, and its activation energy, E*, were measured in various solvents. Both the T-m/eta and E* for s- and i-PMMAs decreased with a decrease in the local segment density. As for the effect of the stereoregularity, the activation energy of both PMMAs showed similar values, but the relaxation time of s-PMMA was ca. 1.5-2.0 times larger than that of i-PRIMA. Such a difference in relaxation time is closely related to the static chain stiffness predicted by the helical wormlike (HW) chain model.

引用

页码：5012 / 5016

页数：5

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