Study On Kinetics Of Copolymerization Of N-P-tolylmaleimide With Vinyl Monomers And Characterization Of The Copolymers

In this article, N-P-tolylmalemide(NPTMI) was prepared from the reaction of maleic anhydride and P-toluidine in one stage, which was testified by FTIR. The mp. of NPTMI was 154℃ and was consistent with the literature.The free radical copolymerization of NPTMI with methyl methacrylate(MMA) ,Vinyl acetate(VAc) and Ethyl Acrylate(EA) were studied. The copolymer composition was calculated from the nitrogen content estimated by the MICO-kijedldahPs method and by elemental analysis. The reactivity ratios had been calculated by Fineman and Ross method. The reactivity ratios were rNPTMI=1.24 rMMA=2.1; rNPTMI= 0.814 rVAC = 0.569; rNPTMI=0.78 rEA = 1.11. The copolymer's thermal properties were investigated. It was found that NPTMI effectively increased the glass transition temperature and the decomposition temperature.Polymers of NPTMI/MMA were synthesized and their thermal properties, mechanical properties and rheological behavior were investigated. The result showed that NPTMI dramatically increased the glass transition temperature and the decomposition temperature. The moderate decrease in the mechanical properties can be encountered by the decrease in the apparent shear viscosity and the improvement in the thermalproperties.The polymers(ENM) containing NPTMI unit were also blended with PVC to improve PVC's heat resistance. The result showed that NPTMI increased the glass transition temperature, the decomposition temperature and mechanical properties. The result illustrated that the blends showed the rheological behavior of that of pseudoplastic liquid. The flow power n had a peak while the ENM feed content increasing.