Stimuli-responsive nanocomposite gels
Stimuli-responsive nanocomposite gels
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DOI：
10.1007/s00396-010-2373-9
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发表时间：
2011-01
影响因子：
2.4
通讯作者：
K. Haraguchi
中科院分区：
文献类型：
--
作者：
K. Haraguchi
以剥离的粘土纳米粒子为载体，采用自由基聚合法合成了一类具有独特的有机/无机(粘土)网络结构的新型聚合物水凝胶--纳米复合水凝胶。由此得到的NC凝胶克服了与化学交联水凝胶相关的大多数缺点，例如机械易碎性、结构异质性和缓慢的消胀速度。以温敏性聚N-异丙基丙烯酰胺(PNIPA)为组分聚合物，制得了具有优异的力学性能、光学性能、溶胀性能和热敏性能的纳米凝胶。NC凝胶的各种性质，如透明度、凝胶体积、细胞培养和表面摩擦等，都会随着温度和环境条件的变化而发生显著变化。纳米凝胶的所有优异性能和新的刺激响应特性都归功于PNIPA/粘土独特的网络结构。通过改变粘土含量和添加溶质，可以在很大程度上控制其热敏性和转变温度。
A new class of polymer hydrogels, nanocomposite hydrogels (NC gels), consisting of a unique organic (polymer)/inorganic (clay) network structure, was synthesized byin situfree-radical polymerization in the presence of exfoliated clay nanoparticles in an aqueous system. The resulting NC gels overcame most of the disadvantages associated with chemically cross-linked hydrogels, such as mechanical fragility, structural heterogeneity, and slow de-swelling rate. By using thermo-sensitive poly(N-isopropylacrylamide) (PNIPA) as a constituent polymer, NC gels with remarkable mechanical, optical, and swelling properties as well as thermo-sensitivity were obtained. The various properties of NC gels, such as transparency, gel volume, cell culturing, and surface friction changed significantly in response to the temperature and surrounding conditions. All the excellent properties and new stimuli-responsive characteristics of NC gels are attributed to the unique PNIPA/clay network structure. The thermo-sensitivities and the transition temperature can largely be controlled by varying the clay content and by the addition of solutes.