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

• 来源期刊: 高分子科学（英文版）
• 学科: 化学
• 年，卷（期）: 1998,（2）
• 页码范围: 185-192
• 页数: 8页
• 分类号: O6
• 语种: 英文

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 (SAd) over a temperature range as wide as ca. 100℃, whereas PB12CN is non-mesomorphic, demonstrating that the backbone rigidity plays an important role in determining the liquid crystallinity of the polyacetylenes.