INFLUENCE OF BACKBONE RIGIDITY ON THE LIQUID CRYSTALLINITY OF MESOGEN-CONTAINING POLYACETYLENES  

作　　者：孔祥兴 宛新华 郭海成 冯新德 唐本忠 

机构地区：[1]Departments of Chemistry Hong Kong University of Science & Technology, Clear Water Bay, Kowloon, Hong Kong [2]Departments of Electrical & Electronic Engineering, Hong Kong University of Science & Technology, Clear Water Bay, Kowloon, Hong Kong [3]Department of Chemistry, Peking University, Beijing 100871, China

出　　处：《Chinese Journal of Polymer Science》1998年第2期185-192,共8页高分子科学（英文版）

基　　金：This work was in part supported by the Hong Kong RGC grants HKUST597/95P and HKUST6149/97P.

摘　　要：Two acetylene polymers containing cyanobiphenyl-based mesogens, poly{10-[((4'-cyano-4-biphenylyl)oxy)carbonyl]-1-decyne} (PA8CN), which has a relatively flexible polyalkyne backbone, and poly {[4-(((12-((4'-cyano-4-biphenylyl)oxy)dodecyl)oxy) carbonyl) phenyl]-acetylene} (PB12CN), which has a fairly rigid poly(phenylacetylene) backbone, were synthesized using respectively WCl6 and [Rh(nbd)Cl](2) as the catalysts. PA8CN exhibits enantiotropic interdigitated smectic A phase (S-Ad) over a temperature range as wide as ca. 100 degrees C, whereas PB12CN is non-mesomorphic, demonstrating that the backbone rigidity plays an important role in determining the liquid crystallinity of the polyacetylenes.Two acetylene polymers containing cyanobiphenyl-based mesogens, poly{10-[((4'-cyano-4-biphenylyl)oxy)carbonyl]-1-decyne} (PA8CN), which has a relatively flexible polyalkyne backbone, and poly {[4-(((12-((4'-cyano-4-biphenylyl)oxy)dodecyl)oxy) carbonyl) phenyl]-acetylene} (PB12CN), which has a fairly rigid poly(phenylacetylene) backbone, were synthesized using respectively WCl6 and [Rh(nbd)Cl](2) as the catalysts. PA8CN exhibits enantiotropic interdigitated smectic A phase (S-Ad) over a temperature range as wide as ca. 100 degrees C, whereas PB12CN is non-mesomorphic, demonstrating that the backbone rigidity plays an important role in determining the liquid crystallinity of the polyacetylenes.

关 键 词：POLYACETYLENE polyalkynes poly(phenylacetylene) substituted polyacetylenes liquid crystalline polymers 

分 类 号：TQ317[化学工程—高聚物工业]