Highly Populated and Nearly Monodispersed Nanosilica Particles in an Organic Medium and Their Epoxy Nanocomposites

作者：Yu, Wenqi; Fu, Jifang^*; Dong, Xing; Chen, Liya; Jia, Haisen; Shi, Liyi

来源：ACS Applied Materials & Interfaces, 2013, 5(18): 8897-8906.

DOI：10.1021/am402845d

• sol-gel
• nanosilica sol
• epoxy
• nanocomposites
• bulk resistivity

An organic aminopropyl-functionalized nanosilica sol was synthesized in the presence of ethyl silicate, gamma-(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 (T-g), and bulk resistivity (rho(v)) 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.

• 出版日期2013-9-25
• 单位上海大学