中文摘要：

基于具有＂反应器颗粒技术（RGT）＂特征的Ziegler-Natta/茂金属复合催化剂（MgCl2/TiCl4/racEt（Ind）2ZrCl2）,以三乙基铝（AlEt3,TEA）和烷基铝氧烷（MAO）分别作为Ti和Zr 2种催化剂组分的助催化剂,利用TEA对茂金属Zr中心在丙烯均聚反应中的阻聚作用,以及乙烯对＂失活＂中心的活性复原,实现了复合催化剂中茂金属Zr中心在聚丙烯催化合金（丙烯均聚＋乙烯/丙烯共聚）过程中的＂可逆失活＂.基于这种方法,以MgCl2/TiCl4/rac-Et（Ind）2ZrCl2为催化剂,TEA/MAO为助催化剂,通过一步法（催化剂和助催化剂一次加入）制备了新型聚丙烯催化合金,聚丙烯基体（PP）选择性地由Ti金属中心生成,而乙丙共聚物（EPR）则有相当大的比例由茂金属Zr中心生成.与完全由Ziegler-Natta催化剂所产生的聚丙烯催化合金相比,新型合金中的EPR共聚序列结构更加无规,同时EPR保持在PP基体中均匀分散.

英文摘要：

A Ziegler-Natta/metallocene composite catalyst （ MgCl2/TiCl4/rac-Et （Ind） 2ZrCl2 ） of ＂ reactor granule technology＂ characteristics is combined with a co-catalyst pair of triethylaluminum （A1Et3 ,TEA） and methyaluminoxane （MAO） to activate its Ti and Zr catalytic species respectively. TEA exhibits a deactivating effect on the Zr species amid propylene homopolymerization,whereas ethylene restores the deactivated species during ethylene-propylene copolymeriation. By this way,a reversible deactivation of the metallocene Zr species has been realized in the preparation of catalyzed polypropylene alloys （propylene homopolymerization ＋ ethylene-propylene copolymerization ） with Ziegler-Natta/metallocene composite catalyst. New catalyzed polypropylene alloys have been prepared with MgCl2TiCl4/rac-Et（Ind）2ZrCl2composite catalyst and TEA/ MAO bi-component co-catalyst,with the catalyst and co-catalyst added in one-pot. The polypropylene （PP） matrix is selectively produced by the Ziegler-Natta Ti species,while the ethylene-propylene copolymer （EPR） is accounted for in large portion by the metallocene Zr species. Compared to conventional Ziegler-Natta catalysts,the Ziegler-Natta/metallocene composite catalyst renders PP alloys with a more random sequence distribution and equally well domain distribution of EPR. This research provides a new route to the controlled preparation of catalyzed PP alloys.