Thermoanalysis and mechancal properties of emulsion copolymer poly(MMA-PMI-ST)

摘要

Terpolymers of methyl methacrylate (MMA),N-phenylmaleimide (PMI) and sty-rene (St) were synthesized by emulsion copolymerization.The glass transition temperatures (T_g) and the thermostability of copolymers were determined by differential scanning calorimetry (DSC) and programmed thermogravimctric analysis (TGA),respectively.The terpolymers show a considerable increase in decomposition temperature,activation energy of decomposition and T_g with increasing content of PMI.Furthermore,the Vicat softening points of the terpolymers rise with PMI content.The mechanical properties (tensile strength and impact strength) of the terpolymers decrease with increasing PMI content and increase insignificantly with increasing St content.