论文部分内容阅读
用非稳态动力学方法处理了两种典型的双活性物种聚合反应体系 ,即具有离子对和自由离子或紧离子对和松离子对的活性聚合反应体系 .给出了数均聚合度、重均聚合度和多分散指数的表达式 .理论计算的结果表明 :当两种活性物种的相互交换反应速率比链增长反应速率相对较大时 ,由稳态法和非稳态法得到的多分散指数基本一致 ,但当活性物种之间的交换反应速率较小时 ,稳态法就会产生较大的误差 ,此时只有非稳态法是有效的 .另外 ,聚合物的分子量分布随着kp 与k′p数值的相互接近以及M0 /I0 的增大而变窄 .
Two kinds of typical polymerization systems of bi-active species were dealt with by unsteady kinetics, that is, an active polymerization system with ion pair and free ion or a pair of fast ion and a pair of pine ion. The number average polymerization degree, Average degree of polymerization and polydispersity index.The theoretical calculation results show that when the interaction rate of two kinds of active species is relatively larger than the chain growth reaction rate, the polydispersity obtained by the steady-state method and the unsteady method The index is basically the same, but when the rate of exchange reaction between active species is smaller, the steady-state method will produce a larger error, at this time only the non-steady-state method is effective.In addition, the polymer molecular weight distribution with kp and k’p values close to each other and M0 / I0 increases narrowing.