Study on Mechanical Properties of Nanocompo -sites Prepared Using Elastomeric Copolymers and Nano-SiO_2

摘要

Nanocomposites were obtained by mixing elastomeric copolymer and nano-SiO_2 in double-screw extruder at 130-150°C, in which the elastomeric copolymer was prepared by copolymerization of poly (methyl methacrylate (PMMA) macromonomer and butyl acrylate(BA)in benzene using azobisisobutyro -nitrile (AIBN) as initiator. The results indicated that increasing the amount of PMMA, the molecular weight of PMMA and copolymers, nano-silica charged resulted in improving the tensile strength and modulus at 300% elongation of nanocomposites, on the contrary, decreasing ultimate elongation and permanent set decrease. In additions, the tensile strength and the modulus at 300% elongation of nanocomposites reached to a maximum while the mass ratio of nano-SiO_2 to copolymer was 3%.