Properties of Anhydride-Cured Epoxy Filled with Silica Treated with Silane Blendsof Amino and Alkyl End Groups

摘要

Cylinders made of a benzyldimethylamine (BDMA)-catalyzed, nadic methyl anhydride(NMA)-cured diglycidyl ether of bishphenol-A (BDGE) were filled with 30 weight % of silica. The silica had previously been treated by silane blends of varying composition, of either gamma-aminopropyltriethoxysilane (APS) and butyltriethoxysilane (BTS) or APS and ethyltriethoxysilane (ETS). A variety of techniques were utilized in order to compare the effects of BTS versus ETS and the concentration of amine in the silane blend. These techniques include cross polarization magic angle spinning (CP-MAS) Silicon 29 solid state nuclear magnetic resonance (NMR), photoacoustic (PAS)-Fourier transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC), thermal gravimetric analysis (TGA), compression strength, scanning electron microscopy (SEM) of fracture surfaces, Hydrogen 1 NMR imaging, and gravimetric analysis of water sorption. The results indicate the importance of structure and composition of the silane interphase on the properties of composite materials.