功能性超支化聚乙烯的合成及其结构研究

摘要：本论文研究了功能性超支化聚乙烯的合成及结构表征；重点讨论不同保护基的极性单体、加料浓度及反应温度对催化活性的影响；通过核磁共振1H NMR分析共聚物中极性单体的含量，得出不同保护基的极性单体与乙烯共聚，催化活性相差很大，保护基团越大，催化活性越高；极性单体加料浓度对催化剂的催化活性和极性单体利用率影响甚少，但有利于增加极性单体在共聚物中的含量；温度升高，催化剂的催化活性为先升后降，温度为20℃时，催化活性达到最大值；加料浓度一定，温度升高可以增加共聚物中极性单体的含量，但降低了共聚物的产量，从而降低了极性单体的利用率。
关键词：后过渡金属催化剂；α-二亚胺镍催化剂；超支化聚乙烯；极性单体；功能化；

Abstract：The synthesis and microstructure of copolymer was investigated. The copolymerization activity influenced by temperature, different protecting groups of polar comonomers and the concentration of comonomer was studied. The incorporation rate of comonomer was analyzed by 1H NMR. There was a large difference in activity of copolymerizing ethylene with polar comonomer which own different protecting groups. The bulky protecting group can result in a higher activity. The concentration of comonomer influence little the activity of copolymerization. The activity of the copolymerization increased with temperature with its highest value at 20℃. Further increasing temperature decreased the catalyst activity. The incorporation rate of comonomer was increasing by temperature at a constant concentration of comonomer. Because the activity of polymerization lowed by temperature, the conversion of comonomer decreased. Besides, the incorporation rate of comonomer increased as the concentration of comonomer.
Key words: the late transition metal catalyst; α-diimine Ni catalyst; hyperbranched polyethylene; polar comonomer; functional;