Zhou Liming, Wang Ziwen, Gao Lijun, Yang Hongcheng, Fang Shaoming
School of Material and Chemical Engineering, Zhengzhou University of Light Industry, Zhengzhou 450000, China.
Polymers (Basel). 2024 Jun 28;16(13):1854. doi: 10.3390/polym16131854.
In this work, a kind of side chain liquid crystalline poly(urethane-acrylate)s was synthesized by free polymerization based on self-made liquid crystalline monomers, and a series of liquid crystalline polyurethane/shape memory polyurethane composite membranes were prepared by electrospinning. The synthesized liquid crystalline poly(urethane-acrylate)s have excellent thermal stability. Due to the regular arrangement of azobenzene on the side chains, polymers can rapidly undergo a photoinduced transition from trans-isomerism to cis-isomerism in THF solution and restore reversible configurational changes under visible light. The composite membranes prepared by electrospinning can also undergo photoinduced deformation within 6 s, and the deformation slowly returns under visible light. Meanwhile, the composites have shape memory, and after deformation caused by stretching, the membranes can quickly recover their original shape under thermal stimulation. These results indicate that the composites have triple response performances of photoinduced deformation, photo-, and thermal recovery.
在本工作中，基于自制的液晶单体通过自由基聚合合成了一种侧链液晶聚（聚氨酯 - 丙烯酸酯），并通过静电纺丝制备了一系列液晶聚氨酯/形状记忆聚氨酯复合膜。合成的液晶聚（聚氨酯 - 丙烯酸酯）具有优异的热稳定性。由于偶氮苯在侧链上的规则排列，聚合物在四氢呋喃溶液中能迅速经历从反式异构体到顺式异构体的光致转变，并在可见光下恢复可逆的构型变化。通过静电纺丝制备的复合膜在6秒内也能发生光致变形，且在可见光下变形缓慢恢复。同时，该复合材料具有形状记忆性能，在拉伸引起变形后，膜在热刺激下能迅速恢复其原始形状。这些结果表明该复合材料具有光致变形、光恢复和热恢复的三重响应性能。
