PREPARATION OF POLYPROPYLENE/CLAY NANOCOMPOSITES BY in situ POLYMERIZATION WITH TiCl_4/MgCl_2/CLAY COMPOUND CATALYST  

作　　者：贺爱华 

机构地区：[1]Key Laboratory of Rubber-Plastics(Ministry of Education),School of Polymer Science and Engineering, Qingdao University of Science and Technology

出　　处：《Chinese Journal of Polymer Science》2011年第5期597-601,共5页高分子科学（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(Nos.20774098,50973123, 50503023);the Scientific Research Startup Foundation of Qingdao University of Science and Technology

摘　　要：TiCl4/MgCl2/clay compound catalyst was prepared by chemical reaction. Exfoliated polypropylene （PP）/clay nanocomposites were synthesized by in situ polymerization with this compound catalyst. Effects of polymerization temperature, polymerization time, propylene pressure, solvent consumption and pre-treat time of catalyst on catalyst activity and catalytic stereospecificity were studied. Under optimal conditions, activity of the nano-compound catalyst is about 88.3 kg/（mol Ti-h）. Isotacticity of PP obtained in the nanocomposites is in the range of 89%-99%, and its melting temperature is about 159℃. The weight-average molecular weight of PP can reach 6.7 × 10^5 - 7.8 × 10^5, and the molecular weight distribution is between 7.7 and 7.9.TiCl4/MgCl2/clay compound catalyst was prepared by chemical reaction. Exfoliated polypropylene （PP）/clay nanocomposites were synthesized by in situ polymerization with this compound catalyst. Effects of polymerization temperature, polymerization time, propylene pressure, solvent consumption and pre-treat time of catalyst on catalyst activity and catalytic stereospecificity were studied. Under optimal conditions, activity of the nano-compound catalyst is about 88.3 kg/（mol Ti-h）. Isotacticity of PP obtained in the nanocomposites is in the range of 89%-99%, and its melting temperature is about 159℃. The weight-average molecular weight of PP can reach 6.7 × 10^5 - 7.8 × 10^5, and the molecular weight distribution is between 7.7 and 7.9.

关 键 词：POLYPROPYLENE CLAY STEREOSPECIFICITY NANOCOMPOSITE Nano-compound catalyst. 

分 类 号：O631.5[理学—高分子化学]