Effect of Hardeners on Phase Behavior and Thermal Properties of Dimeric Liquid Crystalline Epoxy Resins

De-wen ZHOU; Li-yan LIANG; Man-geng LU; Teng-fei SHEN; Wan-ping XIAO

doi:10.14028/j.cnki.1003-3726.2011.12.011

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Effect of Hardeners on Phase Behavior and Thermal Properties of Dimeric Liquid Crystalline Epoxy Resins

更新时间：2022-09-18

- Effect of Hardeners on Phase Behavior and Thermal Properties of Dimeric Liquid Crystalline Epoxy Resins
- Polymer Bulletin Vol. 24, Issue 12, Pages: 122-127(2011)
- 作者机构：
  
  1.中国科学院广州化学研究所，广州　510650
  2.中国科学院研究生院，北京　10049
- 作者简介：
- 基金信息：
- DOI：10.14028/j.cnki.1003-3726.2011.12.011
  CLC：
- Published：2011-12，
  
  Received：24 March 2011，
  
  Revised：06 June 2011，
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De-wen ZHOU, Li-yan LIANG, Man-geng LU, Teng-fei SHEN, Wan-ping XIAO. Effect of Hardeners on Phase Behavior and Thermal Properties of Dimeric Liquid Crystalline Epoxy Resins. [J]. Polymer Bulletin 24(12):122-127(2011)
DOI：

De-wen ZHOU, Li-yan LIANG, Man-geng LU, Teng-fei SHEN, Wan-ping XIAO. Effect of Hardeners on Phase Behavior and Thermal Properties of Dimeric Liquid Crystalline Epoxy Resins. [J]. Polymer Bulletin 24(12):122-127(2011) DOI： 10.14028/j.cnki.1003-3726.2011.12.011.

摘要

以芳香二胺（SAA）、酸酐（T HPA）和叔胺（DMAP）为固化剂，固化偶氮类双介晶基元液晶环氧树脂，采用偏光显微镜和X 射线衍射研究了固化剂对液晶热固体相结构产生的影响。DMAP 催化环氧自聚固化，有利于液晶分子的有序排列，易于形成梯形结构，可以得到近晶相的固化产物。SAA 在较低温度下固化时也得到近晶相结构，但在较高温度固化时和T HPA 固化一样，得到向列相液晶结构。T HPA 固化时，固化剂用量较大，破坏了液晶相的有序结构，只能得到向列相结构的热固体。研究了固化产物的热性能，结果显示，三种体系的玻璃化温度SAA>DMAP>T HPA，热分解温度DMAP>SAA>T HPA。

Abstract

Three kinds of curing agents

aromatic diamine (SAA)

anhydride (THPA) and tertiary amine (DMAP)

were employed to cure the azo-type dimeric liquid crystalline epoxy resins. The phase behavior of liquid crystalline thermosets (LCTs) from different hardeners was studied by polarized optical micrograph and X-Ray Diffraction. DMAP

catalyzing the homopolymerization of epoxy groups

is helpful to the ordered arrangement of mesogens

resulting in LCTs with a smetic phase. For SAA

the smetic LCT can be obtained by cured at a low temperature

but only nematic LCTs can be prepared at high curing temperature. All the LCTs from THPA have the nematic phase. Thermal properties of the LCTs were studied by DSC and TGA.Glass transition temperatures from the three hardeners show the order of SAA>DMAP>T HPA

and the onset temperatures of decomposition have the order of DMAP >SAA>T HPA.

关键词

固化剂偶氮热性能相结构液晶环氧

Keywords

Curing agentAzoThermal propertiesPhase behaviorLiquid crystalline epoxy resins

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