Synthesis and characterization of new ferroelectric liquid-crystalline cyclic oligosiloxanes containing methyleneoxymethylene spacers

被引：17

作者：

Soltysiak, JT

Czuprynski, K

Drzewinski, W

机构：

[1] Ind Chem Res Inst, PL-01793 Warsaw, Poland

[2] Mil Univ Technol, Inst Chem, PL-00908 Warsaw, Poland

来源：

POLYMER INTERNATIONAL | 2006年 / 55卷 / 03期

关键词：

cyclic oligosiloxanes; liquid crystal; smectic phase;

D O I：

10.1002/pi.1943

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

The synthesis of side-chain liquid-crystalline oligocyclosiloxanes containing methyleneoxymethylene spacers, two different mesogenic cores (including biphenyl phenyl carboxylate or biphenyl fluorophenyl carboxylate groups) and chiral tails is presented. Differential scanning calorimetry, optical polarizing microscopy and X-ray diffraction measurements reveal liquid-crystalline properties for all of the synthesized monomers and oligomers. All cyclic oligosiloxanes exhibit enantiotropic smectic A and chiral smectic C phases. The mesogenic properties of the cyclic oligomers and side-chain liquid-crystalline precursor are discussed. (C) 2005 Society of Chemical Industry.

引用

页码：273 / 278

页数：6