標題: SYNTHESIS OF LIQUID-CRYSTALLINE POLYSILOXANES AND POLYMETHACRYLATES WITH BROAD TEMPERATURE RANGES OF THE CHIRAL SMECTIC-C PHASE
作者: HSU, CS
SHIH, LJ
HSIUE, GH
應用化學系
Department of Applied Chemistry
公開日期: 7-六月-1993
摘要: The synthesis of side-chain liquid crystalline polysiloxanes and polymethacrylates containing oligooxyethylene spacers and 4-(S)-2-methyl-1-butyl [[(4-hydroxybiphenyl-4'-yl)carbony;]oxy]benzoate mesogenic side groups is presented. Differential scanning calorimetry, optical polarizing microscopy, and X-ray diffraction measurements reveal chiral smectic mesomorphism for all polymers. All three polysiloxanes present enantiotropic smectic A and chiral smectic C phases. The chiral smectic C phase covers a very broad temperature range (about 200-degrees-C). Among polymethacrylates prepared in this study, the polymethacrylate which contains three oxyethylene units in its spacer is the only one revealing smectic A and chiral smectic C phases. The results seem to demonstrate that the tendency toward a chiral smectic C phase increases with increasing the flexibility of the polymer backbone and the oligooxyethylene spacer can increase dramatically the thermal stability of the chiral smectic C phase.
URI: http://hdl.handle.net/11536/2983
ISSN: 0024-9297
期刊: MACROMOLECULES
Volume: 26
Issue: 12
起始頁: 3161
結束頁: 3167
顯示於類別:期刊論文


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