基于本研究第一部分中提出的三段聚合模型 ,进一步导得聚合物数均相对分子质量的表达式 ,并首次提出了一种确定聚合各阶段引发剂效率和向单体的链转移常数的方法。将数据处理得到的引发剂效率以及向单体的链转移常数 ,代入导得的表达式 ,计算了数均相对分子质量随转化率的变化规律。结果表明 ,计算值与实验值较为一致。 Based on the three-stage polymerization model proposed in the first part of this study, the expression of the number average molecular weight of the polymer was further derived. For the first time, a method for determining the efficiency of the initiator and the chain transfer constant to the monomers in each stage of polymerization was proposed . The efficiencies of the initiators and the chain transfer constants to the monomers obtained from the data processing were substituted into the derived expressions to calculate the change law of the number-average molecular mass with the conversion rate. The results show that the calculated value is in good agreement with the experimental value.