一、前言分批共聚合时,由于单体竞聚率的不同,在每一个瞬间,共聚物的组成与形成該共聚物的未反应单体混合物的比例是不同的(它们的关系卽所谓共聚方程式)。故一般来说,分批共聚合所得共聚物的化学组成总是不均匀的。因此,与均聚物不同,共聚物除了有分子量不均匀的问题以外,还有化学组成不均匀的问题。化学组成不均匀对共聚物的性能发生不利的影响。例如,丙烯腈共聚物能改进聚丙烯腈的染色能力,但假如此共聚物的化学组成不均匀,则染色力也就不 I. Introduction In batch copolymerization, the ratio of the copolymer composition to the unreacted monomer mixture forming the copolymer is different at each instant due to the difference in the monomer reactivity ratio (their relationship, so-called copolymerization equation). Therefore, in general, the chemical composition of the copolymer obtained by batch copolymerization is always not uniform. Therefore, unlike the homopolymer, the copolymer has a problem of uneven chemical composition in addition to the problem of non-uniform molecular weight. Inhomogeneous chemical composition adversely affects the properties of the copolymer. For example, acrylonitrile copolymer can improve the dyeing ability of polyacrylonitrile, but if the chemical composition of the copolymer is not uniform, the dyeing power is not