Shape memory properties of mesogen-jacketed liquid crystalline polymers based on vinylterephthalic acid

doi:10.11949/j.issn.0438-1157.20171089

Abstract

Abstract:

Four kinds of mesogen-jacketed liquid crystalline polymers (PBPCS, PMPCS, PDCHVT, PbiPCS) based on vinylterephthalic acid have been synthesized via free radical polymerization. The results of TGA and DMA demonstrate that they all have good thermal stability, and the higher rigidity of the end group, and the greater rigidity of the corresponding polymer sheet in the temperature range of 30-80℃. Through shape memory angle recovery tests, the results indicate that all mesogen-jacketed liquid crystalline polymer sheets have good shape memory fixation ratios close to 100%. The shape memory recovery effect is related to the end group of polymer side chain. When the end groups of side chain are cyclohexyl and P-butoxy phenyl (corresponding polymers are PBPCS and PDCHVT), the polymer sheets demonstrate good shape memory properties, shape memory recovery ratios are 87% and 100%, respectively. PDCHVT fiber have been prepared by melt spinning, the shape memory properties of PDCHVT fiber have been analyzed by DMA shape memory cycle test, the results show that the fiber exhibits stable and excellent shape memory effect.

Key words: free radical polymerization, mesogen-jacketed liquid crystalline polymers, shape memory effect, processing, sheet, fiber

摘要：

通过自由基聚合合成了四种基于乙烯基对苯二甲酸类甲壳型液晶高分子（PBPCS，PMPCS，PDCHVT，PbiPCS）。TGA和DMA表征结果表明，这四种甲壳型液晶高分子均具有较好的热稳定性，其侧基末端基团刚性越大，相对应的片材在30～80℃温度区间刚性越大。形状记忆弯角回复测试表明：四种聚合物热压成型的片材都具有很好的形状记忆固定率，均接近100%。形状记忆回复效果与聚合物侧基的末端基团有关，侧基末端基团分别为对丁氧基苯基和环己基（对应聚合物分别为PBPCS和PDCHVT）时，片材显示出较好的形状记忆性能，形状记忆回复率分别为87%和100%。将PDCHVT通过熔融纺丝制成纤维，采用形状记忆循环DMA测试表征其形状记忆性能，结果表明PDCHVT纤维具有稳定的优异的形状记忆性能。

关键词: 自由基聚合, 甲壳型液晶高分子, 形状记忆效应, 成型, 片材, 纤维

CLC Number:

TQ317

WU Nie, WAN Liying, LI Aimei, XIAO Chunping. Shape memory properties of mesogen-jacketed liquid crystalline polymers based on vinylterephthalic acid[J]. CIESC Journal, 2018, 69(5): 2282-2289.

吴聂, 万里鹰, 李爱妹, 肖春平. 乙烯基对苯二甲酸类甲壳型液晶高分子的形状记忆性能[J]. 化工学报, 2018, 69(5): 2282-2289.

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