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把向列液晶交联剂 4 (ω 烯丙酰氧基己氧基 )苯甲酸 2 叔丁基 1,4 二酚酯和胆甾液晶单体 4 烯丙氧基苯甲酸胆甾醇酯接枝到含氢硅氧烷链上 ,交联剂的质量分数由 0至 12 %,得到系列液晶弹性体P1～P7·通过热分析、偏光显微分析等手段研究了向列液晶交联剂对弹性体液晶性能的影响·结果表明 ,P1～P7都有液晶性能 ,均为胆甾液晶织构 ,系列液晶弹性体的tg 随交联剂在链中浓度增加而降低 ,ti 变化不大 ,具有较宽的液晶区间 ,在 182℃以上·交联剂质量分数为 2 %时 ,即从P4 开始弹性增加 ,当交联剂的质量分数大于 8%时 ,液晶相存在至热分解温度 ,所有液晶弹性体的热稳定性均较好 ,质量损失 5 %时的热失重温度均在 2 89℃以上·
The nematic liquid crystal crosslinking agent 4 (ω-allyloxyhexyloxy) benzoic acid 2 tert-butyl 1,4-diphenol ester and the cholesteric liquid crystal monomer 4 allyloxybenzoate cholesteryl ester were grafted Hydrogenated siloxane chain, crosslinking agent mass fraction of 0 to 12%, to obtain a series of liquid crystal elastomer P1 ~ P7 · by thermal analysis, polarized light microscopy analysis of nematic liquid crystal crosslinking agent on the elastomer The results show that P1 ~ P7 have liquid crystal properties, all of them are cholesteric liquid crystal texture. The tg of series liquid crystal elastomer decreases with the increasing concentration of crosslinking agent in the chain, and the change of ti is small, Of the liquid crystal region at 182 ° C or more, the crosslinking agent mass fraction is 2%, that is, the elastic modulus increases from P4, when the mass fraction of the crosslinking agent is more than 8%, the liquid crystal phase exists to the thermal decomposition temperature, The thermal stability are better, the mass loss of 5% when the temperature at a weight loss of more than 2 89 ℃ ·