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Self-assembled shape-memory fibers of triblock liquid-crystal polymers

机译：三嵌段液晶聚合物的自组装形状记忆纤维

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摘要

New thermoplastic liquid-crystalline elastomers have been synthesized using the telechelic principle of microphase separation in triblock copolymers. The large central block is made of a main-chain nematic polymer renowned for its large spontaneous elongation along the nematic director. The effective crosslinking is established by small terminal blocks formed of terphenyl moieties, which phase separate into semicrystalline micelles acting as multifunctional junction points of the network. The resulting transient network retains the director alignment and shows a significant shape-memory effect, characteristic and exceeding that of covalently bonded nematic elastomers. Its plasticity at temperatures above the nematic-isotropic transition allows drawing thin well-aligned fibers from the melt. The fibers have been characterized and their thermal actuator behavior-reversible contraction of heating and elongation on cooling-has been investigated.
机译：已经使用三嵌段共聚物中的微相分离的远螯原理合成了新型热塑性液晶弹性体。较大的中心嵌段由主链向列聚合物制成，该聚合物以沿向列导向剂的大自发伸长而闻名。有效的交联是通过由三联苯基部分形成的小末端嵌段建立的，这些末端嵌段相分离成充当网络的多功能连接点的半结晶胶束。所得的瞬态网络保留了指向矢排列，并显示出显着的形状记忆效应，其特征和超过了共价键合的向列弹性体。它在向列各向同性转变以上的温度下具有可塑性，因此可以从熔体中拉出排列良好的细纤维。已经对纤维进行了表征，并研究了它们的热致动器行为-可逆的加热收缩和冷却时的伸长率。

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