ADVANCES IN LIQUID CRYSTALLINE POLYESTERS

作     者：W. J. Jackson Jr. 

作者机构：Research Laboratories Eastman Chemical Company Eastman Kodak Company Kingsport Tennessee U.S.A.Research Laboratories Eastman Chemical Company Eastman Kodak Company Kingsport Tennessee U.S.A. 

出 版 物：《Chinese Journal of Polymer Science》 (高分子科学（英文版）)

年 卷 期：1992年第10卷第3期

页      面：195-202页

核心收录：

学科分类：081704[工学-应用化学] 07[理学] 08[工学] 0817[工学-化学工程与技术] 070305[理学-高分子化学与物理] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 

主　　题：Liquid crystal thermotropic polyester plastic properties 

摘      要：Advances have been made in understanding the interactions of composition, molecular weight, liquid crystallinity,orientation, and three-dimensional crystallinity on the properties of injection-molded and melt-spun liquid crystalline polyesters (LCP s). Two classes of potentially low-cost LCP s were compared:(1) semiflexible LCP s prepared from 1,6-hexanediol and the dimethyl ester of either trans-4, 4 stilbenedicarboxylic acid or 4.4 biphenyldicarboxylic acid and (2) all-aromatic LCP s prepared from terephthalic acid, 2, 6-naphthalenedicarboxylic acid, the diacetate of hydroquinone, and the acetate of p-hydroxybenzoic acid. The effects of composition on the plastic properties of the 4-component all-aromatic LCP s were determined with the aid of a 3 x 3 factorial statistically designed experiment, the generation of equations with a computer program, and the plotting of three-dimensional figures and contour diagrams. The effects of absolute molecular weight (M_w) on the tensile strengths of the semiflexible LCP s and one of the all-aromatic LCP s having an excellent balance of plastic properties were also compared, and it was observed that the semiflexible LCP s required M_w s about 4 times higher than the all-aromatic LCP to attain a given strength. Persistence lengths and molecular modeling were used to explain these differences.