Kinetics for Copolymerization of Methyl Methacrylate with N-Cyclohexylaleimide

摘要

The kinetics for the radical copolymerization of methyl methacryalte (MMA) with N-cyclohexylmaleimide (NCMI) was investigated. The initial copolymerization rate R_p is proportional to the initiator concentration to the power o f0.54. The apparent activation energy of theoverall copolymerization was measured to be 69.0 kJ/mol. The monomer reactivity ratios were determined to be r_NCMI - 0.42 and r_MMA = 1.63. R_p reduces slightly, and the molecular weight of the resultant copolymer decreases with increasing the concentration of the chain transfer agent N-dodecanethiol (RSH). The more the transfer agent, the nattower the molecualr weight distribution of the resulting copolymer. The following chain-tranfer constant of RSH for the copolymerization of MMA with NCMI in benzene at 50 deg C was obtained : C_s = 0.23. The glass transition temperature (T_g) of the copolymer increases with increasing f_NCMI, which indicates that adding NCMI can heat resistance of Plexiglas.