毕业设计 2-(-邻烷氧基苯基)-咪唑配体的合成及催化乙烯聚合.doc

2-(-邻烷氧基苯基)-咪唑配体的合成及催化乙烯聚合

摘要
本论文以水杨醛、联苯甲酰、乙酸铵等原料合成了多取代咪唑类配体。将所得多取代咪唑类配体与四氯化钛于甲苯中合成了相应的咪唑钛配合物。然后在助催化剂MAO作用下，以所得钛的咪唑配合物为催化剂前体，催化乙烯聚合反应。系统的考察了Al/Ti比(50-800)、聚合反应温度(7.5-55oC)、催化剂用量等因素对催化剂活性的影响。实验结果表明：催化活性随着温度的升高有明显的增大，但继续升高反应温度活性呈下降趋势，在25℃是活性最高；催化剂的活性随Al/Ti比的增大而增大。在选定的优化条件下催化剂活性可达148.0 Kg-PE•mol-M 1•h-1。

关键词:  多取代咪唑配体，多取代咪唑钛配合物，乙烯聚合，甲基铝氧烷(MAO)

ABSTRACT
Multi-substituted imidazole ligands were synthesized by using aromatic aldehyde, benzil, ammonium acetate as starting materials. Their corresponding titanium complexes were synthesized in toluene from the reaction of the imidazole ligands and titanium tetrachloride. In the present of methylaluminoxane(MAO) co-catalysts, the obtained imidazole titanium complexes were used as catalyst precursor, ethylene polymerization properties were systematically studied. Ethylene polymerization experiments were carried out with Al/Ti ratio ranged from 50 to 800, in the reaction temperature 7.5, 15, 25, 35, 45, 55oC. The results show that the activities of the catalysts increased with the increasing of Al/Ti ratio. With the polymerization temperature increasing, the catalysts activities firstly increased, and then decreased. The highest activity was observed at 25oC. An optimum activities 148.0 Kg-PE • mol-M 1 • h-1 was obtained at 25oC with Al/Ti at 800.

Key words:   multi-substituted imidazole ligands
imidazole complexes of titanium
ethylene polymerization
methylaluminoxane(MAO)

目录
第1章 前言 1
§1.1 课题的提出及研究的目的、意义 1
§1.2 过渡金属化合物催化烯烃聚合的研究概况 2
§1.3 咪唑配体的研究概况 5
第2章 实验部分 8
§2.1 原料和试剂 8
§2.2 咪唑配体及配合物的合成 8
§2.2.1醛原料及配体合成 9
§2.2.2 钛配合物的合成 11
§2.3 助催化剂MAO的合成 11
§2.4 催化乙烯聚合 12
第3章 结果与讨论 13
§3.1 催化剂的合成影响因素 13
§3.2 温度对催化剂聚合活性的影响 13
§3.3 Al/Ti比对催化剂聚合活性的影响 14
第4章 结论 16
参考文献 17
致    谢 21