화학공학소재연구정보센터
Thermochimica Acta, Vol.668, 80-86, 2018
Mechanisms and kinetics of non-isothermal polymerization of N,N '-bismaleimide-4,4 '-diphenylmethane with 2-thiobarbituric acid
Mechanisms and kinetics of non-isothermal polymerization of N,N'-bismaleimide-4,4'-diphenylmethane (BMI) with 2-thiobarbituric acid (TBTA) were investigated. Competition among free radicals polymerization, Michael addition reaction and aza-Michael addition reaction mechanisms for the BMI/TBTA reaction system was characterized by using differential scanning calorimeter (DSC), electron spin resonance (ESR) and H-1-NMR techniques. Both radical polymerization and (aza) Michael reaction mechanisms played an important role in the reaction system. Model-free (isoconversional) method was used to determine triplet kinetic parameters for the polymerization of BMI with TBTA. Average activation energy (E-alpha) and pre-exponential factor (A(alpha)) are ca. 71 kJ mol(-1) and 17.85 x 10(7) min(-1) in the fractional conversion (alpha) range 0.1-0.9, respectively. The polymerization of BMI with TBTA is primarily reaction-controlled [f(alpha) = (1 - alpha)].