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按照聚合反应动力学理论,以B*基团转化率为参数,导出了考虑到非等速率修正后的自缩合乙烯基聚合反应(SCVP)所生成的超支化聚合物的分布函数,建立了确定分布函数二次矩的微分方程组.产物的支化度可以通过A*与B*基团反应速率比(r)和A基团转化率(x)两个参数进行调整,对一个确定的x,为了得到最大的支化度,需要一个与x有关的特定r值.x值较小时,需要的r值很大,随着x的增加,需要的r值迅速变小.反应终了时,选择r=2.59可以得到一个最大的支化度0.5.
According to the theory of polymerization kinetics, the distribution function of hyperbranched polymers with self-condensation of vinyl groups (SCVP) modified by non-constant rate was derived based on the B * group conversion. The differential equations of the second moment of the distribution function The degree of branching of the product can be adjusted by two parameters of the reaction rate ratio (r) of the A * and B * groups and the conversion rate of the A group (x) x, in order to get the maximum degree of branching, we need a specific value of x associated with x. When the value of x is small, the value of r needed is large and the value of r needed decreases rapidly as x increases. At the end of the reaction, Choose r = 2.59 can get a maximum degree of branching 0.5.