【摘要】 用游离基溶液聚合方法合成了乙酸乙烯酯—乙烯基吡咯烷酮（Ｖｐ）共聚物。研究了反应条件对共聚合反应的影响和共聚物组成与转化率的关系，并从元素分析和￣（１３）ＣＮＭＲ的结果计算得体系的竞聚率ｒ＿１，ｒ＿２分别为０．２８２±０．０３７和０．２７８±０．０４１；ｒ＿２分别为３．７５±０．２８和３．７０±０．２９．结果表明：引发剂浓度小和投料比中单体Ｖｐ的含量高，有利于生成特性粘度［η］大的共聚物，反应时间长，［η］下降，共聚物组成与转化率的关系与用Ｍａｙｏ－Ｌｅｗｉｓ式处理得到的结果基本符合；￣（１３）ＣＮＭＲ测定链段序列分布的结果与用末端基效应模型计算的结果一致。因此，认为是以末端基效应模型机理进行，ＤＳＣ测定结果显示出共聚物玻璃化温度与组成关系符合ＦＯＸ方程，说明共聚物为无规共聚物。更多还原

【Abstract】 Poly（vinyl acetate-N-vinyl pyrrolidone）（P（VAc-Vp））was prepared by free- radical polymerization in solution. The reactivity ratios（r₁ and r₂）of two monomers were mea- sured.It was showed that r₁（VAc） and r₂（Vp）were 0.282±0.037 and 3.75±0.28,respec- tively,The effect of the reaction conditions on the copolymerization and the relationship between the conversion and Copolymer compositions were studied.The results of DSC and ￣（13）CNMR deter- minations showed that the copolymerization was agree with the compolymer coml1Osition equation derived by Lewis and Mayo, The sequence distributions by ￣（13）C NMR were fitted well with the da- ta calculated based on the Terminal Model of copolymerization（first-order Markov Chain Model ）.更多还原