Lyotropic liquid-crystalline behavior of polyisocyanodipeptides

被引：16

作者：

Metselaar, Gerald A. ^{[1
]}

Wezenberg, Sander J. ^{[1
]}

Cornelissen, Jeroen J. L. M. ^{[1
]}

Nolte, Roeland . M. ^{[1
]}

Rowan, Alan E. ^{[1
]}

机构：

[1] Radboud Univ Nijmegen, Inst Mol & Mat, NL-6525 ED Nijmegen, Netherlands

来源：

JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY | 2007年 / 45卷 / 06期

关键词：

chiral; helical polymers; helical structures; liquid-crystalline polymers (LCP); liquid crystals; polyisocyanides;

D O I：

10.1002/pola.21891

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Rigid, helical polyisocyanodipeptides derived from alanine (PIAAs) that form lyotropic liquid-crystalline (LC) phases in tetrachloroethane Eire presented. An investigation by optical microscopy between crossed polarizers demonstrated that PIAAs prepared by the polymerization of isocyanodipeptide monomers with an activated tetrakis isocyanide nickel(II) catalyst could form cholesteric LC phases in tetrachloroethane in concentrations between 18 and 30 wt %. Cholesteric LC phases that were formed in solutions of greater than 25 wt % displayed a reversal of the cholesteric helix upon annealing at 50 degrees C. Diastereomeric PIAA mixtures displayed cholesteric LC behavior only when the PIAAs had the same helix screw sense. (c) 2006 Wiley Periodicals, Inc.

引用

页码：981 / 988

页数：8

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