Nonisothermal Kinetics of Free-Radical Polymerization of 2,2-Dinitropropyl Methacrylate

摘要

The 2,2-dinitropropyl methacrylate(DNPMA) was synthesized by esterification of α-methacrylic acid with 2,2-dinitropropanol.The free-radical bulk polymerization of DNPMA in the presence of 2,2-azobisisobutyronitrile(AIBN) was investigated by differential scanning calorimetry(DSC) in the nonisothermal mode.Kissinger,Ozawa and Barrett methods were applied to determine the activation energy(Ea) and the reaction order of the free-radical polymerization.The results showed that the temperature of exothermic polymerization peaks increased with increasing heating rate.With increasing the molar ratio of monomer/initiator and the heating rate,the reaction order of nonisothermal polymerization was approximately equal to 1.The average Ea value from Kissinger and Ozawa methods(77.74±1.07 kJ/mol) was smaller than the value from the Barrett method(Ea=102.36 kJ/mol).