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研究表明，ＳＯＣｌ２／ＳｎＣｌ４引发体系的苯乙烯聚合反应很快，但所得聚合产物的分子量分布宽（Ｍｗ／Ｍｎ＝４．３７），且其ＧＰＣ曲线呈多重峰；单独加入季铵盐（ｎ－Ｂｕ４ＮＣｌ）或二甲基亚砜（ＤＭＳＯ）可使聚合产物分子量分布明显变窄，并随浓度的增加而加强，但程度有限，不显示活性聚合特征；ＤＭＳＯ和ｎ－Ｂｕ４ＮＣｌ同时加入，表现出协同效应，不仅能保持较高的聚合反应活性，而且产物分子量分布很窄（Ｍｗ／Ｍｎ＝１．２７），分子量随单体转化率增加而增加，且线性关系良好，聚合物链数只与引发剂初始浓度相关，显示活性聚合特征。
The results showed that the polymerization of styrene in SOCl2 / SnCl4 system was rapid, but the molecular weight distribution of the obtained polymer was broad (Mw / Mn = 4.37) and the GPC curve showed multiple peaks. The addition of quaternary ammonium salt (n- Bu4NCl) or dimethylsulfoxide (DM-SO) can narrow the molecular weight distribution of the product and increase with the increase of concentration, but to a limited extent, it does not show the characteristics of living polymerization; DMSO and n-Bu4NCl are added simultaneously, The synergistic effect can not only maintain the high polymerization activity, but also have a narrow molecular weight distribution (Mw / Mn = 1.27). The molecular weight increases with the monomer conversion and the linear relationship is good. Associated with initial initiator concentration, shows active polymerization characteristics.