Effect of hard segment architecture on shape memory properties of polycaprolactone-based polyurethane containing azobenzene
Effect of hard segment architecture on shape memory properties of polycaprolactone-based polyurethane containing azobenzene
复制标题
硬段结构对含偶氮苯聚己内酯基聚氨酯形状记忆性能的影响
DOI：
10.1007/s10853-015-9586-8
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发表时间：
2016-03
期刊：
影响因子：
--
通讯作者：
uo Li
中科院分区：
文献类型：
--
作者：
Libin Liu;Wenyuan Fang;Congde Qiao;Ti;uo Li
摘要：本文合成了两种以偶氮苯为侧链硬段和主链硬段的聚氨酯。它们的热稳定性高，足以用于形状记忆。对于侧链上有偶氮苯的聚氨酯（PU），由于偶氮苯的取向不规则，偶氮苯对聚己内酯（PCL）的结晶抑制作用更为明显。对于主链含偶氮苯的聚氨酯（PUR），其结晶度主要受分子量的影响。PU-3500和PUR-3500在50%应变下具有99%的固形能力和98%的回收率。随着应变的增加，PU-3500的回收率降低，PUR-3500的回收率提高。简要讨论了硬段结构对形状记忆性能影响的机理。重要的是，这两个分子在紫外线照射下表现出反式顺式异构化。这项工作对形状记忆聚氨酯的结构设计和在智能设备中的应用具有重要意义。图形抽象
AbstractIn this work, we synthesized two kinds of polyurethanes with azobenzene as hard segments in the side chains and in the main chains. Their thermal stabilities were high enough for their shape memory application. For polyurethane with azobenzene in the side chain (PU), the azobenzene has more distinctly effect on inhibiting crystallization of polycaprolactone (PCL) because of irregular orientation of azobenzene. For polyurethane with azobenzene in the main chain (PUR), the crystallinity of PCL is mainly affected by its molecular weight. PU-3500 and PUR-3500 exhibit perfect shape fixing ability of 99 % with recovery ratio of 98 % at 50 % strain. The recovery ratio is decreased for PU-3500 and increased for PUR-3500 as the applied strain increased. The mechanism of the hard segment structures effect on the shape memory behavior is briefly discussed. Importantly, the two molecules behave trans–cis isomerization under UV irradiation. This work is crucially important for the structural design of shape memory polyurethane and applications in the smart devices.Graphical Abstract
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作者：
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