【摘要】 在离子型聚合中 ,活性中心是离子对 ,离子对间的距离越大 ,活性中心的活性越强 ,基于活性中心的这种特性 ,改变体系的极性就能改变活性中心的活性 .本文通过加入亲电试剂硝基苯达到了对抗衡离子产生溶剂化作用的效果 ,改变了两种单体的聚合速度 .同时还发现 ,活性中心的活性提高以后 ,对两种单体聚合速度的影响不同 ,本文详细地描述了这一过程 .更多还原

【Abstract】 In this paper, tetrahydrofuran (THF) and phthalic anhydride (PAH) are utilized as monomers to carry out the study of cationic copolymerization. In cationic polymerization, ion pair is active center, distance between positive and negative ions in the ion pair will influnce the activity of active centers. The polymerization is studied by adding electrophilic reagent to the polymerization system to produce solvating effect on counter anions, then the distance between the positive and negative ions is changed, consequently activity of the active centers is increased. It is also foung that after nitrobenzene (NB) is added to the polymerization system the activity of active centers is increased, the influnce on polymerization rate for the two monomers is different, the reason will discussed in detail in this paper.更多还原