Effect of Mesoporosity on Thermal and Mechanical Properties of Polystyrene/Silica Composites
Effect of Mesoporosity on Thermal and Mechanical Properties of Polystyrene/Silica Composites
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DOI：
10.1021/am900540x
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发表时间：
2010-01
影响因子：
9.5
通讯作者：
Melissa A. Ver Meer;B. Narasimhan;B. Shanks;S. Mallapragada
中科院分区：
文献类型：
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作者：
Melissa A. Ver Meer;B. Narasimhan;B. Shanks;S. Mallapragada
在这项研究中，介孔或胶体二氧化硅颗粒被纳入聚苯乙烯矩阵通过熔融共混或苯乙烯聚合引发的颗粒表面。研究了聚合物基复合材料中填料颗粒的表面形态与其热机械性能之间的关系。高分子量聚苯乙烯-二氧化硅杂化物是通过修饰单分散胶体二氧化硅和模板介孔二氧化硅纳米粒子的表面而产生的。官能化的二氧化硅表面接枝与烷基卤引发剂的原子转移自由基聚合。在不存在游离引发剂的情况下进行聚合。通过动态力学分析、热重分析、透射电子显微镜和扫描电子显微镜研究了这些复合材料的物理性能。结果表明，原子转移自由基聚合法制备的胶体和介孔二氧化硅聚合物复合材料具有相似的接枝聚合物结构。
In this study, mesoporous or colloidal silica particles were incorporated into polystyrene matrices via melt blending or by styrene polymerization initiated from the particle surface. The relationships between the surface morphology of filler particles in polymer composites and their thermomechanical properties were investigated. High molecular weight polystyrene−silica hybrids were generated by modifying the surfaces of monodisperse colloidal silica and templated mesoporous silica nanoparticles. The functionalized silica surfaces were grafted with alkyl halide initiators for atom transfer radical polymerization. Polymerization was conducted without free initiator present. The physical properties of these composites were studied by dynamic mechanical analysis, thermogravimetric analysis, transmission electron microscopy, and scanning electron microscopy. Results indicate that colloidal and mesoporous silica polymer composites generated by atom transfer radical polymerization have similar grafted polymer c...