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Keywords = main chain liquid crystal elastomer

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18 pages, 6363 KiB  
Article
Programmable Complex Shape Changing of Polysiloxane Main-Chain Liquid Crystalline Elastomers
by Yuhe Zhang, Xiuxiu Wang, Wenlong Yang, Huixuan Yan, Xinyu Zhang, Dongxu Han, Yifan He, Chensha Li and Liguo Sun
Molecules 2023, 28(12), 4858; https://doi.org/10.3390/molecules28124858 - 20 Jun 2023
Cited by 5 | Viewed by 2281
Abstract
Liquid crystal elastomers (LCEs) are shape-morphing materials whose large and reversible shape transformations are caused by the coupling between the mobile anisotropic properties of liquid crystal (LC) units and the rubber elastic of polymer networks. Their shape-changing behaviors under certain stimuli are largely [...] Read more.
Liquid crystal elastomers (LCEs) are shape-morphing materials whose large and reversible shape transformations are caused by the coupling between the mobile anisotropic properties of liquid crystal (LC) units and the rubber elastic of polymer networks. Their shape-changing behaviors under certain stimuli are largely directed by the LC orientation; therefore, various strategies have been developed to spatially modulate the LC alignments. However, most of these methods are limited as they require complex fabrication technologies or have intrinsic limitations in applicability. To address this issue, programmable complex shape changes in some LCE types, such as polysiloxane side-chain LCEs, thiol-acrylate main-chain LCEs, etc., were achieved by using a mechanical alignment programming process coupled with two-step crosslinking. Here, we report a polysiloxane main-chain LCE with programmable 2- and 3D shape-changing abilities that were created by mechanically programming the polydomain LCE with two crosslinking steps. The resulting LCEs exhibited a reversible thermal-induced shape transformation between the initial and programmed shapes due to the two-way memory between the first and second network structures. Our findings expand on the applications of LCE materials in actuators, soft robotics, and smart structures where arbitrary and easily programmed shape morphing is needed. Full article
(This article belongs to the Special Issue Hierarchical Assembly and Micro-/Nano-Structured Liquid Crystal Soft Materials toward Novel Applications beyond Display)
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28 pages, 4424 KiB  
Review
Soft Elasticity in Main Chain Liquid Crystal Elastomers
by Sonal Dey, Dena M. Agra-Kooijman, Wanting Ren, Philip J. McMullan, Anselm C. Griffin and Satyendra Kumar
Crystals 2013, 3(2), 363-390; https://doi.org/10.3390/cryst3020363 - 7 Jun 2013
Cited by 61 | Viewed by 18907
Abstract
Main chain liquid crystal elastomers exhibit several interesting phenomena, such as three different regimes of elastic response, unconventional stress-strain relationship in one of these regimes, and the shape memory effect. Investigations are beginning to reveal relationships between their macroscopic behavior and the nature [...] Read more.
Main chain liquid crystal elastomers exhibit several interesting phenomena, such as three different regimes of elastic response, unconventional stress-strain relationship in one of these regimes, and the shape memory effect. Investigations are beginning to reveal relationships between their macroscopic behavior and the nature of domain structure, microscopic smectic phase structure, relaxation mechanism, and sample history. These aspects of liquid crystal elastomers are briefly reviewed followed by a summary of the results of recent elastic and high-resolution X-ray diffraction studies of the shape memory effect and the dynamics of the formation of the smectic-C chevron-like layer structure. A possible route to realizing auxetic effect at molecular level is also discussed. Full article
(This article belongs to the Special Issue Advances in Liquid Crystals)
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