Poly(N-isopropylacrylamide) Gel Prepared Using a Hydrophilic Polyrotaxane-Based Movable Cross-Linker
Poly(N-isopropylacrylamide) Gel Prepared Using a Hydrophilic Polyrotaxane-Based Movable Cross-Linker
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DOI：
10.1021/ma902349j
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发表时间：
2010-02-23
期刊：
影响因子：
5.5
通讯作者：
Takeoka, Yukikazu
中科院分区：
文献类型：
--
作者：
Bin Imran, Abu;Seki, Takahiro;Takeoka, Yukikazu
以亲水性聚轮烷为可移动交联剂，N-异丙基丙烯酰胺（NIPA）为单体，制备了一种新型温敏聚合物凝胶。与典型的由双官能交联剂如N，N '-亚甲基双丙烯酰胺（TN凝胶）制备的聚NIPA凝胶和先前报道的使用疏水聚轮烷作为交联剂的聚NIPA凝胶相比，这种新的聚NIPA凝胶具有光学透明性、机械柔软性、异常溶胀能力和前所未有的快速热敏性。而TN凝胶可能需要一天以上的时间才能完全去溶胀，以应对突然的温度变化，我们的新凝胶崩溃在类似于10分钟。亲水性和可移动性的交联剂有助于这些前所未有的性能，这种热敏polyNIPA凝胶。此外，这种新型的交联剂可以应用于任何由自由基聚合制备的常规凝胶，并可能改善凝胶的刺激响应和机械性能。
A novel type of thermosensitive polymer gel was fabricated using a hydrophilic polyrotaxane as a movable cross-linker and N-isopropylacrylamide (NIPA) as a monomer. An optical transparence, mechanical softness, abnormal swelling capacity, and unprecedentedly fast thermosensitivity are among the salient features of this new polyNIPA gel in comparison with typical polyNIPA gels prepared by bifunctional cross-linker Such as N,N'-methylenebisacrylamide (TN gels) and a previously reported polyNIPA gel using a hydrophobic polyrotaxane as a cross-linker. Whereas TN gels can take more than a day to undergo full deswelling in response to sudden temperature change, Our new gel collapses in similar to 10 min. The hydrophilicity and movability of the cross-linker contribute to these unprecedented properties of this thermosensitive polyNIPA gel. Moreover, this new type of cross-linker can be applied to any of the conventional gels made by radical polymerization and will likely improve the stimuli responses and mechanical properties of the gels.