Micromechanical and microdielectric transitions in P(S-g-EO) modified PPO/PMMA blends

被引:36
作者
Eklind, H
Maurer, FHJ
Steeman, PAM
机构
[1] CHALMERS UNIV TECHNOL,DEPT POLYMER TECHNOL,S-41296 GOTHENBURG,SWEDEN
[2] DSM RES BV,NL-6160 MD GELEEN,NETHERLANDS
关键词
interphase; micromechanical transition; microdielectric transition;
D O I
10.1016/S0032-3861(96)00613-1
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 effect of two poly(styrene-graft-ethylene oxide)s with different graft lengths and graft densities on the interphase properties of poly(2,6-dimethyl-1,4-phenylene oxide)/poly(methyl methacrylate) (PPO/PMMA) blends was studied by different techniques. The miscibility between the copolymers and the homopolymers, as well as the phase reduction in the ternary blends, was favoured by longer and more separated grafts. Transmission electron microscopy shows that the addition of any of the copolymers leads to the formation of an interphase between the heterogeneous PPO and PMMA phases. The ternary blends present micromechanical and microdielectric transitions at temperatures in the range 60-100 degrees C, where the transition temperatures decrease with increasing copolymer contents. The micromechanical and microdielectric transitions originate from the change in the relative moduli values and the dielectric losses of the matrix, interphase and particle phase of the ternary blends. (C) 1997 Elsevier Science Ltd.
引用
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页码:1047 / 1055
页数:9
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