论文部分内容阅读
以咪唑类离子液体[omim]BF4为溶剂,在0℃下,采用不同的引发体系,实现并证实了IBVE在离子液体中进行阳离子聚合的可行性。对比传统溶剂(CH2Cl2)中IBVE的阳离子聚合特征,发现在离子液体中合成的聚合物的产率和分子量更高、分子量分布更窄,产物的SEC(RI)曲线呈单峰分布。从聚合物末端结构分析,离子液体中阳离子聚合的基元反应与传统溶剂中基本一致,未发现离子液体中咪唑阳离子参与链引发反应以及四氟硼酸阴离子参与链转移/链终止反应。离子液体和传统溶剂中合成的PIBVE的玻璃化转变温度(Tg)分别为-20.35℃和-18.08℃,两者非常接近。
Using imidazole ionic liquid [omim] BF4 as solvent, different initiating systems were used at 0 ℃ to achieve and confirm the feasibility of IBVE cationic polymerization in ionic liquids. Comparing the cationic polymerization characteristics of IBVE in the traditional solvent (CH2Cl2), it was found that the yield and molecular weight of the polymer synthesized in the ionic liquid were higher, the molecular weight distribution was narrower, and the SEC (RI) curve of the product showed a single peak distribution. From the analysis of polymer end structure, the elementary reaction of cationic polymerization in ionic liquid is basically the same as that in the traditional solvent. No imidazolium cation is involved in the chain initiation reaction and the tetrafluoroborate anion is involved in the chain transfer / chain termination reaction in the ionic liquid. The glass transition temperature (Tg) of PIBVE synthesized in ionic liquid and traditional solvent are -20.35 ℃ and -18.08 ℃, respectively, which are close to each other.