Effect of temperature on copolymerization parameters of hydroxyethyl acrylate and methyl methacrylate

摘要

The copolymerization of 2-hydroxyethyl acrylate (HEA, M_1) and methyl methacrylate (MMA, M_2) in cyclohexanone was studied. The multiple experiments of solution copolymerization with low conversion were carried out at two sensitive composition feed points at 60, 80, 100, 120 and 140 deg. C, respectively. The composition of the copolymers was analyzed by H-NMR. The reactivity ratios which were estimated by the Error-in- Variable Method (EVM) of Mayo-Lewis equation were found to be r_1=0.328, r_2=1.781 for 60 deg. C; 0.375 for 80 deg. C; 0.406, 1.654 for 100 deg. C; 0.493, 1.540 for 120 deg. C and 0.455, 1.400 for 140 deg. C; and the 95/100 joint confidence intervals of the reactivity ratios were also determined. According to r_1 and r_2, Arrhenius relations and the activity energy difference between the homo-and cross-propagation were calculated.