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Synergistic effects of zwitterionic segments and a silane coupling agent on zwitterionic shape memory polyurethanes

机译：两性离子链段和硅烷偶联剂对两性离子形状记忆聚氨酯的协同作用

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摘要

Recently, zwitterionic shape memory polyurethanes (ZSMPUs) have found many promising applications in smart biomedical field. This paper provides a novel strategy to improve shape memory properties of ZSMPUs by using a silane coupling agent, namely 3-glycidyloxypropyl-trimethoxysilane (KH560). The synergistic effects of zwitterionic segments and silane coupling agents on the structure, morphology, thermal properties, mechanical properties, and shape memory properties were carefully investigated. The results demonstrate that the incorporation of KH560 does not influence the original molecular structure and morphology of ZSMPUs, and the KH560-modified ZSMPUs form a hard–soft phase separation structure. Also, the KH560 modification promotes the entanglement of hard segments, and thus provides better mechanical properties to ZSMPUs-KH560. Moreover, the silane coupling agent can provide lubrication to influence the aggregation of soft segments while the zwitterionic segments promote the formation of crystal seeds. Therefore, a good semi-crystalline soft phase endows the ZSMPUs-KH560 with a decent shape fixity (e.g. above 94%), and the entangled hard segments greatly enhance the shape recovery of ZSMPUs (e.g. above 90%).
机译：最近，两性离子形状记忆聚氨酯（ZSMPU）在智能生物医学领域中发现了许多有希望的应用。本文提供了一种通过使用硅烷偶联剂3-环氧丙氧基丙基三甲氧基硅烷（KH560）来提高ZSMPU形状记忆性能的新策略。仔细研究了两性离子链段和硅烷偶联剂对结构，形态，热性能，机械性能和形状记忆性能的协同作用。结果表明，KH560的掺入不会影响ZSMPUs的原始分子结构和形态，KH560修饰的ZSMPUs形成了硬-软相分离结构。另外，KH560改性剂可促进硬链段的缠结，从而为ZSMPUs-KH560提供更好的机械性能。此外，硅烷偶联剂可提供润滑作用以影响软链段的聚集，而两性离子链段则促进了晶种的形成。因此，良好的半结晶软相赋予ZSMPUs-KH560良好的形状固定性（ eg 高于94％），缠结的硬链段大大增强了ZSMPUs（ eg 高于90％）。

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