功能性超支化聚乙烯的合成及其結構研究

摘要：本論文研究了功能性超支化聚乙烯的合成及結構表征；重點討論不同保護基的極性單體、加料濃度及反應溫度對催化活性的影響；通過核磁共振1H NMR分析共聚物中極性單體的含量，得出不同保護基的極性單體與乙烯共聚，催化活性相差很大，保護基團越大，催化活性越高；極性單體加料濃度對催化劑的催化活性和極性單體利用率影響甚少，但有利于增加極性單體在共聚物中的含量；溫度升高，催化劑的催化活性為先升后降，溫度為20℃時，催化活性達到最大值；加料濃度一定，溫度升高可以增加共聚物中極性單體的含量，但降低了共聚物的產量，從而降低了極性單體的利用率。
關鍵詞：后過渡金屬催化劑；α-二亞胺鎳催化劑；超支化聚乙烯；極性單體；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;