论文部分内容阅读
The reaction of C3H6(N=CH-Ar-OH)2 (Ar = 5-tert-butyl-C6H3 (2a), 3-tert-butyl-C6H3 (2b), 3-methyl-C6H3 (2c)) with 2 equiv. of BuLi followed by 1 equiv TiCl4 yields the dichloride complexes [C3H6(N=CH-Ar-O)2]TiCl2[Ar = 5-tert-butyl-C6H3 (3a), 3-tert-butyl-C6H3 (3b), 3-methyl-C6H3 (3c)]. The structure of compound 3a has been confirmed by X-ray crystallographic analysis. These Ti (IV) dichloride complexes are active catalysts for the polymerization of eth- ylene with methylaluminoxane (MAO) as a cocatalyst. Ac- tivities up to 4.14×105 g (mol Ti h)?1 were obtained in dried toluene. And the molecular weights of polyethylene are in the range 1.53×104—16.4×104. Catalyst activity, polymer yield, and polymer molecular weight can be controlled over a wide range by changing the ligand structure and variation of reac- tion parameters such as Al-Ti ratio and polymerization reac- tion temperature.
The reaction of C3H6 (N = CH-Ar-OH) 2 with Ar = 5-tert-butyl- C6H3 (2a) equiv. of BuLi followed by 1 equiv TiCl4 yields the dichloride complexes [C3H6 (N═CH-Ar-O) 2] TiCl2 [Ar = 5-tert-butyl-C6H3 ) 3-methyl-C6H3 (3c)]. This structure of compound 3a has been confirmed by X-ray crystallographic analysis. These Ti (IV) dichloride complexes are active catalysts for the polymerization of ethylene with methylaluminoxane (MAO) as A cocatalyst. Acivities up to 4.14 x 105 g (mol Ti h)? 1 were obtained in dried toluene. And the molecular weights of polyethylene are in the range of 1.53 x 104-16.4 x 104. Catalyst activity, polymer yield, and polymer molecular weight can be controlled over a wide range by changing the ligand structure and variation of reac tion parameters such as Al-Ti ratio and polymerization reac tion temperature.