Controlled post-synthesis grafting of thermoresponsive poly(N-isopropylacrylamide) on mesoporous silica nanoparticles
Controlled post-synthesis grafting of thermoresponsive poly(N-isopropylacrylamide) on mesoporous silica nanoparticles
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DOI：
10.1002/pat.3534
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发表时间：
2015-09-01
影响因子：
3.4
通讯作者：
Scalarone, Dominique
中科院分区：
文献类型：
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作者：
Jadhav, Sushilkumar A.;Miletto, Ivana;Scalarone, Dominique
通过对溶胶-凝胶法的改进，合成了孔径为5 nm的有序介孔二氧化硅纳米颗粒。通过甲基丙烯氧基功能化的介孔纳米粒子与N-异丙基丙烯酰胺单体的蒸馏-沉淀聚合，在纳米粒子的介孔内实现了热响应性聚N-异丙基丙烯酰胺的两步接枝。通过改变单体与甲基丙烯氧基功能化纳米粒子的比例，实现了对接枝聚合物数量的精确控制。通过红外光谱、X射线衍射、动态光散射、透射电子显微镜、热分析和气体体积分析对聚合物接枝杂化纳米颗粒进行了表征，表明聚合物在介孔内的存在和热响应行为，同时保留了纳米颗粒特有的介孔结构。版权所有(C)2015 John Wiley&Sons，Ltd.
Ordered mesoporous silica nanoparticles with pore diameter of 5nm were synthesized by modification of the sol-gel synthesis method. Post-synthesis two-step grafting of thermoresponsive poly(N-isopropylacrylamide) inside the mesopores of the nanoparticles was carried out by distillation-precipitation polymerization of the methacryloxy-functionalized mesoporous nanoparticles with N-isopropylacrylamide monomer. A precise control on the quantity of the grafted polymer was achieved by changing the ratio of monomer to methacryloxy-functionalized nanoparticles. The polymer-grafted hybrid nanoparticles obtained were fully characterized by infrared spectroscopy, X-ray diffraction, dynamic light scattering, transmission electron microscopy, thermal, and gas-volumetric analyses, which clearly showed presence and thermoresponsive behavior of the polymer inside the mesopores with the preservation of the characteristic mesoporous structure of the nanoparticles. Copyright (C) 2015 John Wiley & Sons, Ltd.