Multitemperature Memory Actuation of a Liquid Crystal Polymer Network over a Broad Nematic–Isotropic Phase Transition Induced by Large Strain,ACS Macro Letters

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Multitemperature Memory Actuation of a Liquid Crystal Polymer Network over a Broad Nematic–Isotropic Phase Transition Induced by Large Strain
ACS Macro Letters ( IF 5.1 ) Pub Date : 2018-02-28 00:00:00 , DOI: 10.1021/acsmacrolett.8b00089
Rong Yang _{1,

2} , Yue Zhao ₂

Affiliation

The shape change of a polymer actuator based on liquid crystal network (LCN) generally occurs over a relatively sharp LC-isotropic phase transition. Reported herein is the discovery of an unusual phenomenon and the enabled actuation control for LCN. The smectic phase of a LCN with mesogenic moieties on the chain backbone can be suppressed by high elongation of the specimen, which gives rise to a broad nematic–isotropic phase transition. Consequently, the actuation force and related shape of the actuator can be activated to a given degree by easily varying the temperature over a wide range (35 K for LCN prepared with 500% strain) to adjust the proportion of the order–disorder phase transition. This reversible multitemperature memory actuation can translate into many stable and interconvertible shapes with one single LCN actuator.

中文翻译：

大应变诱导的宽向列-各向同性相变中液晶聚合物网络的多温度记忆驱动

基于液晶网络 (LCN) 的聚合物致动器的形状变化通常发生在相对急剧的 LC 各向同性相变中。本文报告了一个不寻常现象的发现和 LCN 的启用驱动控制。链骨架上具有介晶部分的 LCN 的近晶相可以通过试样的高伸长率来抑制，这会产生宽的向列-各向同性相变。因此，致动器的致动力和相关形状可以通过在很宽的范围内轻松改变温度（对于用 500% 应变制备的 LCN 为 35 K）来调节有序 - 无序相变的比例，从而在给定的程度上被激活。这种可逆的多温度记忆驱动可以通过一个 LCN 驱动器转化为许多稳定且可相互转换的形状。

更新日期：2018-02-28

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