环己烷类聚硅氧烷侧链液晶的合成与液晶行为研究

李颖

doi:10.3788/YJYXS20163102.0142

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环己烷类聚硅氧烷侧链液晶的合成与液晶行为研究

材料与器件 | 更新时间：2020-08-12

- 环己烷类聚硅氧烷侧链液晶的合成与液晶行为研究
- Synthesis and mesomorphic behavior of side-chain liquid-crystalline polysiloxanes containing two mesomorphic monomer with cyclohexane
- 液晶与显示 2016年31卷第2期页码：142-148
- 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：
  
  [ "李颖(1980-),女,陕西西安人,博士,讲师,主要从事新型液晶高分子及液晶基元的研究。E-mail:liyingxust@126.com" ]
- 基金信息：
  
  西部地区人才培养特别项目(No.201408615042)();陕西省教育厅专项科研计划资助项目(No.2013JK0920)()
- DOI：10.3788/YJYXS20163102.0142
  中图分类号： O753+.2
- 收稿日期：2015-09-15，
  
  修回日期：2015-10-20，
  
  纸质出版日期：2016-02-05
- 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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