多尺度定制结构的表面附着水凝胶薄膜
Multiscale Surface-Attached Hydrogel Thin Films with Tailored Architecture
摘要：
报道了一种制备表面附着水凝胶薄膜的简便方法，该水凝胶薄膜具有良好的化学控制和定制的结构，厚度范围从纳米到微米。合成，其中包括交联和接枝的预成型和烯反应性聚合物链通过硫醇-烯点击化学，具有良好的控制，而无需添加引发剂的主要优点。由于硫醇--烯点击反应可以通过UV照射（除了热加热之外）选择性地激活，因此容易合成微图案化的水凝胶膜。我们的方法的多功能性说明了制造各种化学聚合物网络的可能性，如刺激响应水凝胶，在各种固体基板，如硅晶片，玻璃和金表面。另一个有吸引力的特征是开发具有靶向结构的新的复杂水凝胶膜。各种架构的聚合物膜的制造被证明：多层水凝胶膜，其中单网络堆叠在另一个，互穿网络膜与两个网络在同一层的混合物，和纳米复合材料水凝胶膜，其中纳米颗粒被稳定地捕获在网格的网络内。由于其简单性和多功能性，这种表面附着水凝胶膜的新方法应该在聚合物涂层领域产生强烈影响
英文摘要：
A facile route for the fabrication of surface-attached hydrogel thin films with well-controlled chemistry and tailored architecture on wide range of thickness from nanometers to micrometers is reported. The synthesis, which consists in cross-linking and grafting the preformed and ene-reactive polymer chains through thiol--ene click chemistry, has the main advantage of being well-controlled without the addition of initiators. As thiol--ene click reaction can be selectively activated by UV-irradiation (in addition to thermal heating), micropatterned hydrogel films are easily synthesized. The versatility of our approach is illustrated by the possibility to fabricate various chemical polymer networks, like stimuli-responsive hydrogels, on various solid substrates, such as silicon wafers, glass, and gold surfaces. Another attractive feature is the development of new complex hydrogel films with targeted architecture. The fabrication of various architectures for polymer films is demonstrated: multilayer hydrogel films in which single-networks are stacked one onto the other, interpenetrating networks films with mixture of two networks in the same layer, and nanocomposite hydrogel films where nanoparticles are stably trapped inside the mesh of the network. Thanks to its simplicity and its versatility this novel approach to surface-attached hydrogel films should have a strong impact in the area of polymer coatings
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