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本文对比研究了用(Ⅰ):TiCl_4/MgCl_2/Al(C_2H_5)_3和(Ⅱ):TiCl_4/MgCl_2/Al(C_2H_5)_3/Zn(C_2H_5)_2两种载体催化体系在常压下进行乙烯配位聚合的动力学行为,测定了聚合速率V_p、T_i活性中心比浓度[C~*]、聚合活化能△E、聚合速率常数K_p及链增长寿期L值。并分别测定以Al(C_2H_5)_3与Zn(C_2H_5)_2为链转移剂的链转移速度常数乓K_(tr,Al)与K_(tr,Zn)以及链转移活化能△E_(tr,Al)与△E_(tr,Zn)。表明Zn(C_2H_5)_2能有效地进一步提高催化效率和降低聚乙烯的分子量并进行讨论。
In this paper, we studied the catalytic performance of ethylene with Ti (I): TiCl 4 / MgCl 2 / Al (C 2 H 5) 3 and (Ⅱ) TiCl 4 / MgCl 2 / Al (C 2 H 5) 3 / Zn (C 2 H 5) The polymerization kinetics of V_p, T_i, [C ~ *], polymerization activation energy △ E, polymerization rate constant K_p and chain extension lifetime L were measured. The activities of K_ (tr, Al) and K_ (tr, Zn), as well as the activation energy △ E_ (tr, Al) of the chain transfer were determined by using Al (C_2H_5) _3 and Zn (C_2H_5) And △ E_ (tr, Zn). The results show that Zn (C 2 H 5) 2 can effectively improve the catalytic efficiency and reduce the molecular weight of polyethylene and are discussed.