Abstract: | Polymerisation of methyl acrylate (MA) initiated by O2-ascorbic acid (AA)-Cu2+ system was studied in aqueous medium at 40°C. The rate of polymerisation Rp, was found to increase, remain constant, and then decrease with increasing Cu2+]. Rp was found to depend on Cu2+]0,6, AA]0, O2]0,6, and MA]1,3 in the increasing region, on Cu2+]0, AA]0, O2]0,6, and MA]1,6 in the constant region and on Cu2+]?0,9, AA]0, O2]0,7, and MA]2,0 in the decreasing region. Rate laws were derived assuming a plausible reaction mechanism for the different regions. Rp increased with ionic strength and decreased with H2SO4,]. An initial increase, then steady state followed by a decrease in rate with temperature was noticed in the range 25 ? 55°C. kp/kt1/2 values were calculated and compared with literature values. Chain lengths were determined viscometrically. |