Synthesis and mesomorphic behavior of side-chain liquid-crystalline polysiloxanes containing two mesomorphic monomer with cyclohexane

LI Ying

doi:10.3788/YJYXS20163102.0142

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Synthesis and mesomorphic behavior of side-chain liquid-crystalline polysiloxanes containing two mesomorphic monomer with cyclohexane

Material and Device | 更新时间：2020-08-12

- Synthesis and mesomorphic behavior of side-chain liquid-crystalline polysiloxanes containing two mesomorphic monomer with cyclohexane
- Chinese Journal of Liquid Crystals and Displays Vol. 31, Issue 2, Pages: 142-148(2016)
- 作者机构：
  
  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：
  
  Supported by Special Project for Skilled People in Western Region of China(No.201408
- DOI：10.3788/YJYXS20163102.0142
  CLC： O753+.2
- Received：15 September 2015，
  
  Revised：20 October 2015，
  
  Published：05 February 2016
- 稿件说明：
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李颖,. 环己烷类聚硅氧烷侧链液晶的合成与液晶行为研究[J]. 液晶与显示, 2016,31(2): 142-148

LI Ying,. Synthesis and mesomorphic behavior of side-chain liquid-crystalline polysiloxanes containing two mesomorphic monomer with cyclohexane[J]. , 2016,31(2): 142-148
李颖,. 环己烷类聚硅氧烷侧链液晶的合成与液晶行为研究[J]. 液晶与显示, 2016,31(2): 142-148 DOI： 10.3788/YJYXS20163102.0142.

LI Ying,. Synthesis and mesomorphic behavior of side-chain liquid-crystalline polysiloxanes containing two mesomorphic monomer with cyclohexane[J]. , 2016,31(2): 142-148 DOI： 10.3788/YJYXS20163102.0142.

摘要

选用环己烷类液晶基元反式-4-乙烯基-反式-4'-丙基双环己烷(M

)和反式-4-丁烯基-反式-4'-丙基双环己烷(M

)

通过硅氢加成反应将其接枝到柔性的聚硅氧烷主链上

合成了含有2种环己烷结构的聚硅氧烷侧链液晶P

产率为80.3%。采用傅立叶变换红外光谱法(FTIR)和氢核磁共振谱法(

H-NMR)对其分子结构进行表征

说明其分子结构符合预期;采用热台偏光显微镜法(POM)和X射线衍射法(XRD)对其液晶相类型和液晶行为进行观察和分析

发现在升降温过程中所呈现出胆甾相油状条纹织构和小板块织构

揭示出因有序度不同所导致的不同织构特征;采用差示扫描量热法(DSC)和综合热分析法(TGA)对其热性能进行分析

确定其液晶区间为28.68 K

(5wt%)

为405.25 ℃

均高于液晶基元的液晶区间和热稳定性。

Abstract

A novel Side-Chain Liquid-Crystalline Polysiloxanes containing two Mesomorphic monomer with Cyclohexane (P

) was synthesized by graft polymerization

using (trans

trans)-4-propyl-4'-vinyl-bicyclohexane(M

) and (trans

trans)-4-propyl-4'-butenyl-bicyclohexane(M

)with Cyclohexane groups

and the production rate is 80.3%. The molecular structure of P

was confirmed by means of Fourier transform infrared spectroscopy and Hydrogen-nuclear magnetic resonance spectra. Liquid crystal phase and liquid crystal behavior of P

were analyzed by polarizing optical microscopy(POM) and X-ray diffraction(XRD)

illustrating the cholesteric oily striated texture and platelet texture during increasing and decreasing temperature

and different texture character resulting from order of molecular chain. Thermal properties of P

were analyzed by differential scanning calorimetry(DSC) and thermal gravimetric analyzer (TGA)

confirming the Mesomorphic region of 28.68 K and the 5% TG temperature(

(5wt%)

) of 405.25 ℃

which are higer than that of M

and M

关键词

Keywords

references

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