Nano-Science & Technology Research Center and ‡Department of Chemistry, College of Science, Shanghai University , 99 Shangda Road, Shanghai 200444, People's Republic of China.
ACS Appl Mater Interfaces. 2013 Sep 25;5(18):8897-906. doi: 10.1021/am402845d. Epub 2013 Sep 16.
An organic aminopropyl-functionalized nanosilica sol was synthesized in the presence of ethyl silicate, γ-(aminopropyl)triethoxysilane (KH550), and N,N-dimethylformamide (DMF) via a sol-gel technique and then used to prepare epoxy nanocomposites. Structure and morphology analyses of the obtained aminopropyl-functionalized nanosilicas were observed by dynamic light scattering (DLS), transmission electron microscopy (TEM), and high-resolution TEM (HRTEM). TEM and DLS showed that modified nanosilicas with an average diameter of 30 nm dispersed homogeneously in DMF. The effects of the aminopropyl-functionalized nanosilica particles on the flexural modulus, impact strength, glass transition temperature (Tg), and bulk resistivity (ρv) of the epoxy nanocomposites were investigated. The toughening mechanisms and microstructures were determined in terms of the impact fracture surface morphology using scanning electron microscopy.
一种有机氨丙基功能化纳米硅溶胶是在硅酸乙酯、γ-（氨丙基）三乙氧基硅烷（KH550）和 N，N-二甲基甲酰胺（DMF）的存在下，通过溶胶-凝胶技术合成的，然后用于制备环氧树脂纳米复合材料。通过动态光散射（DLS）、透射电子显微镜（TEM）和高分辨率 TEM（HRTEM）观察了所得氨丙基功能化纳米硅的结构和形态。TEM 和 DLS 表明，平均直径为 30nm 的改性纳米硅在 DMF 中均匀分散。研究了氨丙基功能化纳米硅粒子对环氧树脂纳米复合材料的弯曲模量、冲击强度、玻璃化转变温度（Tg）和体电阻率（ρv）的影响。通过扫描电子显微镜观察冲击断裂表面形貌，确定了增韧机理和微观结构。
