Synthesizing Multi-Walled Carbon Nanotube-Polymethyl Methacrylate Conductive Composites and Poly(lactic acid) Based Composites

Multi-walled carbon nanotube was modified with polymethyl methacrylate (MWCNT-PMMA) by in situ solution radical polymerization in the presence of 2,2'-Azobis (isobutyronitrile) as an initiator. The products with different addition of methyl methacrylate (MMA) were pressed into slices to prepare specimens for electrical conductivity testing. It was found that the MWCNT-PMMA nanocomposites demonstrate excellent electrical conductivity. To investigate the microsphere morphology and the colloidal surfactant of MWCNTs in MWCNT-PMMA composites, samples were submitted to scanning electron microscopy and transmission electron microscopy. The thermogravimetric analysis of the prepared composites confirmed that MWCNTs as a thermal stabilizer for PMMA, which could have a wide range of potential applications, such as in catalysts, sensors, environmental remediation, and energy storage. Two series of poly(lactic acid) (PLA) based biocomposites with different MMA additions and MWCNT-PMMA composites contents were prepared with twin-screw extruding and injection molding. The results show the mechanical properties changed a little with the MMA and MWCNT-PMMA composites contents increasing, which suggested the well compatibility between MWCNT-PMMA composites and PLA. (C) 2014 Society of Plastics Engineers