文献类型：期刊文献

英文题名：RHEOLOGICAL BEHAVIORS OF BISPHENOL SERIES THERMOTROPIC LIQUID-CRYSTALLINE WHOLLY AROMATIC COPOLYESTERS

作者：ZHAO, ZM; WU, XQ; LIN, YW

机构：[1]E CHINA UNIV CHEM TECHNOL,DEPT POLYMER MAT ENGN & SCI,SHANGHAI 200237,PEOPLES R CHINA

年份：1993

卷号：50

期号：11

起止页码：1917

外文期刊名：JOURNAL OF APPLIED POLYMER SCIENCE

收录：;WOS:【SCI-EXPANDED(收录号:WOS:A1993MH33400008)】；

语种：英文

摘要：Rheological experiments were performed on a series of thermotropic liquid crystalline aromatic copolyesters based on terephthalic acid (TPA), isophthalic acid (IPA), p-hydroxybenzoic acid (HBA), and a family of bisphenols. The anisotropic melts behaved as non-Newtonian fluids in a shear elongation flow. The non-Newtonian exponents of the melts decreased with increasing the linearity of the bisphenol bridge group, and decreased with increasing the optical anisotropy in the liquid crystalline phase. The cross-section morphologies along the longitudinal direction of the extrudates were surveyed by scanning electronic microscopy (SEM) and discussed with melt-flow rate distributions. The extrudates exhibited skin-core microstructures and oriented fibril structures. The die swells of the extrudates decreased sharply to negligible levels when shear stress was above 1000 Pa. (C) 1993 John Wiley & Sons, Inc.