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采用TM_(110)谐振腔和φ2mm样品管,记录了以N,N-二甲基苯胺与过氧化苯甲酰为引发体系的甲基丙烯酸甲酯本体聚合反应过程中增长自由基的ESR谱。由此得到反应过程中的增长自由基浓度及其构象。计算了链增长反应速率常数k_p。结果表明:链增长反应为扩散控制过程。
The TM_ (110) resonator and φ2mm sample tube were used to record the ESR spectrum of free radicals in the polymerization of methyl methacrylate with N, N-dimethylaniline and benzoyl peroxide as initiator. The free radical concentration and its conformation during the reaction are thus obtained. The chain growth reaction rate constant k_p was calculated. The results show that the chain growth reaction is the diffusion control process.