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ZJUS-A
Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering)  2004, Vol. 5 Issue (8): 912-917    DOI: 10.1631/jzus.2004.0912
Materials & Chemical Science     
Study on the distribution of active centers in novel low Ti-loading MgCl2-supported Ziegler-Natta catalyst
WANG Jian-feng, WANG Li, ZHAO Zhen-rong, WANG Wen-qing, CHEN Tao
State Key Lab of Polymer Reaction Engineering, College of Materials Science and Chemical Engineering, Zhejiang University, Hangzhou 310027, China; Ningbo College, Ningbo 315011, China
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Abstract  Novel MgCl2-supported Ziegler-Natta (Z-N) catalysts prepared using a new one-pot ball milling method can effectively control the amounts of Ti-loading in the catalysts. Complex GPC data on polypropylene synthesized by these novel catalysts were analyzed using the method of fitting the molecular weight distribution (MWD) curves with a multiple Flory-Schulz function. It was found that multiple active centers exist in these novel catalysts. Detailed study of the effects of the Ti-loadings in the catalysts on the distribution of the active centers showed that the Ti-loadings in the novel MgCl2-supported Z-N catalysts might affect the proportion of each type of active centers; and might be the main factor responsible for the effect of the Ti-loadings on the microstructure, the molecular weight and molecular weight distribution width of the resultant polymer, the catalytic activity and polymerization kinetics.

Key words： Supported Ziegler-Natta catalyst      Propylene polymerization      Active center      Molecular weight distribution     
Received: 25 September 2003     
CLC:  O63  
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WANG Jian-feng
WANG Li
ZHAO Zhen-rong
WANG Wen-qing
CHEN Tao
Cite this article:

WANG Jian-feng, WANG Li, ZHAO Zhen-rong, WANG Wen-qing, CHEN Tao. Study on the distribution of active centers in novel low Ti-loading MgCl2-supported Ziegler-Natta catalyst. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 2004, 5(8): 912-917.

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http://www.zjujournals.com/xueshu/zjus-a/10.1631/jzus.2004.0912     OR     http://www.zjujournals.com/xueshu/zjus-a/Y2004/V5/I8/912

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