Multiple glass transition and nanophase separation in poly(n-alkyl methacrylate) homopolymers

被引：127

作者：

Beiner, M ^{[1
]}

Schröter, K ^{[1
]}

Hempel, E ^{[1
]}

Reissig, S ^{[1
]}

Donth, E ^{[1
]}

机构：

[1] Univ Halle, Fachbereich Phys, D-6099 Halle, Germany

来源：

MACROMOLECULES | 1999年 / 32卷 / 19期

关键词：

D O I：

10.1021/ma981780n

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Shear data in the temperature range from -145 degrees C to the flow zone are presented for the poly(n-alkyl methacrylate)s from methyl (C = 1) to lauryl (C = 12). Three qualitatively different glass transitions are observed in the shear curves at 10 rad/s: (i) the conventional a process in the C < 5 members, (ii) the high temperature a process in the C > 5 members, and (iii) an additional polyethylene-like glass transition, ape, in the C greater than or equal to 3 members. All three processes depend systematically on side chain length. Two alternative empirical pictures for the coexistence of two glass transitions are discussed: (a) a static nanophase separation between main chains and side chains and (b) a dynamic heterogeneity with two different time and length scales.

引用

收藏

页码：6278 / 6282

页数：5

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