Dynamic Properties of Temperature-Sensitive Poly(N-isopropylacrylamide) Gel Cross-Linked through Siloxane Linkage
Dynamic Properties of Temperature-Sensitive Poly(N-isopropylacrylamide) Gel Cross-Linked through Siloxane Linkage
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DOI：
10.1021/la000170p
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发表时间：
2001
期刊：
影响因子：
3.9
通讯作者：
Xianzheng Zhang;R. Zhuo
中科院分区：
文献类型：
--
作者：
Xianzheng Zhang;R. Zhuo
凝胶是一种不溶于水的聚合物材料，尽管它可以在其网络结构中吸收大量的水。聚（N-异丙基丙烯酰胺）（PNIPA）凝胶表现出响应于外部温度变化的体积变化，并且该性质在许多领域中是有用的。本文以乙撑三乙氧基硅烷（ETEOS）为交联剂，在酸性条件下合成了一种新型PNIPA凝胶。当外部温度变化时，这种硅氧烷结合的PNIPA凝胶实现了显着快速的响应速率。我们认为，响应速率的改善可能是由于在聚合/交联过程中产生的聚合物网络的大孔结构。这种大孔结构可以提供相互连接的水释放通道，并防止在收缩过程中形成致密、厚的皮层。另一方面，在再溶胀过程中，水也可以通过这些水通道扩散到聚合物网络中。
A gel is a water-insoluble polymeric material though it can absorb a lot of water in its network structure. The poly(N-isopropylacrylamide) (PNIPA) gel exhibits a change in volume in response to external temperature changes and this property is useful in many fields. In this manuscript, a novel PNIPA gel was synthesized by using ethylene triethoxy silane (ETEOS) as the cross-linking agent under acidic conditions. This siloxane incorporated PNIPA gel achieves a dramatically rapid response rate when the external temperature is changed. We suggest that the improvement of the response rate could be due to the macroporous structure of the produced polymer network during the polymerization/cross-linking process. This macroporous structure can provide interconnected water release channels and prevent the formation of a dense, thick skin layer at the shrinking course. On the other hand, water can also diffuse into the polymer network through these water channels during the reswelling process.