LIQUID-CRYSTALLINE MAIN-CHAIN POLYMERS WITH A POLY(P-PHENYLENE TEREPHTHALATE) BACKBONE .4. X-RAY-DIFFRACTION OF THE POLYESTER WITH DODECYLOXY SIDE-CHAINS

被引:20
作者
DAMMAN, SB
VROEGE, GJ
机构
[1] TNO Plastics and Rubber Research Institute, 2600 JA Delft
关键词
X-RAY DIFFRACTION; CRYSTAL STRUCTURE; RIGID ROD POLYMER; THERMOTROPIC; PHASE BEHAVIOR;
D O I
10.1016/0032-3861(93)90115-Q
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
A detailed X-ray investigation on oriented fibres and films of poly(p-phenylene 2,5-didodecyloxyterephthalate) revealed that this polymer can exist in two stable crystal modifications, A and B, at room temperature. Modification B is a highly crystalline classical structure. In modification A the side chains do not follow the restrictions imposed by their regular attachment to the main chains; they form clusters between the main chain layers. Upon heating to above the side chain disordering temperature T(s) (T(s)(A) almost-equal-to 40-degrees-C, T(s)(B) almost-equal-to 100-degrees-C) these modifications transfer to the less ordered structure A', in which the side chains are disordered but the position of the main chains, relative to each other, remains strongly correlated. Above the main chain melting temperature T(m) (almost-equal-to 170-degrees-C) part of the positional ordering of the main chains is lost and a mesophase with biaxial ordering exists. This biaxial ordering is lost at T(i) (almost-equal-to 240-degrees-C) and an isotropic melt is formed.
引用
收藏
页码:2732 / 2739
页数:8
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