Syhthesis and Mesomorphic Properties of Side-Chain Liquid-Crystalline Polysiloxanes Exhibiting Spherulite Texture of Polymeric Smectic A Phase

LI Ying; ZHANG Guang-cheng; LIU Bin; JIANG Ying; SUN Wei-min

doi:10.3788/YJYXS20112604.0437

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Syhthesis and Mesomorphic Properties of Side-Chain Liquid-Crystalline Polysiloxanes Exhibiting Spherulite Texture of Polymeric Smectic A Phase

Material Physics & Chemistry | 更新时间：2020-08-12

- Syhthesis and Mesomorphic Properties of Side-Chain Liquid-Crystalline Polysiloxanes Exhibiting Spherulite Texture of Polymeric Smectic A Phase
- Chinese Journal of Liquid Crystals and Displays Vol. 26, Issue 4, Pages: 437-442(2011)
- 作者机构：
  
  1. 西北工业大学理学院应用化学系,陕西西安,710072
  2. 西安科技大学材料科学与工程学院,陕西西安,710054
- 作者简介：
- 基金信息：
- DOI：10.3788/YJYXS20112604.0437
  CLC： O753+.2
- Received：23 January 2011，
  
  Revised：25 March 2011，
  
  Published Online：20 August 2011，
  
  Published：20 August 2011
- 稿件说明：
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李颖, 张广成, 刘斌, 蒋莹, 孙伟民. 近晶A球粒织构聚硅氧烷侧链液晶的合成与液晶性能研究[J]. 液晶与显示, 2011,26(4): 437-442

LI Ying, ZHANG Guang-cheng, LIU Bin, JIANG Ying, SUN Wei-min. Syhthesis and Mesomorphic Properties of Side-Chain Liquid-Crystalline Polysiloxanes Exhibiting Spherulite Texture of Polymeric Smectic A Phase[J]. , 2011,26(4): 437-442
李颖, 张广成, 刘斌, 蒋莹, 孙伟民. 近晶A球粒织构聚硅氧烷侧链液晶的合成与液晶性能研究[J]. 液晶与显示, 2011,26(4): 437-442 DOI： 10.3788/YJYXS20112604.0437.

LI Ying, ZHANG Guang-cheng, LIU Bin, JIANG Ying, SUN Wei-min. Syhthesis and Mesomorphic Properties of Side-Chain Liquid-Crystalline Polysiloxanes Exhibiting Spherulite Texture of Polymeric Smectic A Phase[J]. , 2011,26(4): 437-442 DOI： 10.3788/YJYXS20112604.0437.

摘要

以小分子蓝相小板块液晶(反

反)-4-丙基-4'-乙烯基双环己烷(3HHV)为液晶基元

通过与聚甲基氢硅氧烷进行硅氢加成反应

合成了一种新的聚硅氧烷侧链液晶

产率为78%。通过傅立叶变换红外光谱(FTIR)和核磁共振谱(

H-NMR)对单体和聚合物进行结构表征

证实了单体中双环己烷结构和双键的存在

说明了硅氢加成反应近于完全;通过热失重分析仪(TGA)分析了单体和聚合物的耐热性;通过差示扫描量热仪(DSC)、热台偏光显微镜(POM)和X射线衍射仪(XRD)对单体和聚合物的液晶行为进行分析

证实了二者液晶性的存在

且聚合物的介晶区间相比于单体提高了98.4 ℃

同时POM分析还揭示了合成的液晶高分子在降温过程中呈现出的罕有的聚合物近晶A球粒织构。

Abstract

A new type of side-chain liquid-crystalline polysiloxanes (SCLCPs) was synthesized by graft polymerization

using(trans

trans)-4-propyl-4'-vinyl-bicyclohexane(3HHV) with platelet texture of a blue phase as mesogenic monomer

and the production rate is 78%. The bicyclohexane structure and double bond of monomer and the hydrosilylation reaction in monomer and polymer were confirmed by characterizing the chemical structure of liquid crystal monomer and polymer by means of Fourier transform infrared spectroscopy and hydrogen-nuclear magnetic resonance spectra. Liquid crystal behavior of monomer and polymer were analyzed by differential scanning calorimetry

polarizing optical microscopy and X-ray diffraction. The mesophase temperature range of polymer was increased by 98.4 ℃ comparing with the mesophase temperature range of monomer. Meanwhile

spherulite texture of polymeric smectic A phase of liquid crystal polymer was revealed in the cooling cycle by polarizing optical microscopy

and this texture was so uncommon that can hardly be found in the liquid crystalline polymers.

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references

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