ABg型单体缩聚反应的动力学分析

研究了AB_g型单体缩聚反应的动力学,导出了分子量分布函数以及数均和重均分子量.一些结果与Flory用统计方法得到的一致.数值计算结果表明,单体上B官能团越多,反应所得的超支化聚合物的分子量分布越宽;多分散性随着A基团转化率的增加而增加,且当反应接近完成时迅速增加,这个结论与Turner等的实验数据定性地一致.

Kinetic Analysis for Polycondensation of ABg Type Monomers

This article studied the kinetics of the polycondensation of AB g monomers(where A and B denote different sorts of functional groups which can react with each other, and g is the number of B functional groups in a monomer). The molecular weight distribution function and the number and weight average molecular weights had been derived, which are in agreement with those given by Flory using statistical approach. Numerical results show that the more the B functional groups in a monomer, the wider the molecular weight distribution of the resulting hyperbranched polymer. The polydispersity increases with increasing the conversion of A groups, and increases very fast when the polycondensation approaches completion. This conclusion is qualitatively in agreement with experimental data reported by Turner and coworkers.