Reconfiguration and shape memory triggered by heat and light of carbon nanotube–polyurethane vitrimer composites
Reconfiguration and shape memory triggered by heat and light of carbon nanotube–polyurethane vitrimer composites
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DOI：
10.1002/app.45784
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发表时间：
2018-02
影响因子：
3
通讯作者：
Peiyao Yan;Wei Zhao;Liang Jiang;Bo Wu;Kai Hu;Ye Yuan;Jingxin Lei
中科院分区：
文献类型：
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作者：
Peiyao Yan;Wei Zhao;Liang Jiang;Bo Wu;Kai Hu;Ye Yuan;Jingxin Lei
热固性形状记忆聚合物因其在保持永久形状方面的优越性而得到广泛应用。然而，这种材料的缺点也是明显的，即由于化学交联结构而丧失了再加工能力。幸运的是，人们发现了一类新的SMP，称为“玻璃体聚合物”，由于动态共价键的存在，它可以通过拓扑重排进行重塑或再加工。因此，这种新的热固性SMP可能成为一种新的解决方案。本文制备了碳纳米管-聚氨酯玻璃化物（CNT-PUV）复合材料，该复合材料具有基于熵变的热致形状记忆和基于氨基甲酸酯键的转氨甲酰化反应的热重构能力。此外，由于碳纳米管的光热转换效应，碳纳米管的引入赋予了它们近红外（NIR）触发的形状记忆和重构特性。此外，由于近红外激光的特性，CNT-PUVs的逐步形状恢复实现从预定义的临时形状到永久形状。© 2017威利期刊公司. J.应用聚合物Sci. 2017，135，45784。
Thermoset shape-memory polymers (SMPs) are widely applied because of their superiority in maintaining permanent shapes. However, the inferiority of this material is also conspicuous, namely the loss of reprocessing ability owing to the chemically crosslinked structure. Fortunately, a new class of SMPs, known as “vitrimers,” was discovered, which can be reshaped or reprocessed via topological rearrangement due to the existence of dynamic covalent bonds. Thus, this new thermoset SMP could become a novel solution. In this paper, carbon nanotube–polyurethane vitrimer (CNT-PUV) composites have been prepared, which possess the capability of thermally induced shape memory based on entropy changes and thermal reconfiguration based on transcarbamoylation reactions of carbamate bonds. In addition, the introduction of CNTs endows them with properties of near-infrared (NIR) triggered shape memory and reconfiguration due to the photothermal conversion effect of CNTs. Besides, due to the character of the NIR laser, step-by-step shape recovery of CNT-PUVs is realized from predefined temporary shapes to a permanent shape. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 135, 45784.