The effect of inorganic and organic macromolecular structures on the performance of metallocene polymerization catalysts

被引:0
|
作者
Ciardelli, F [1 ]
Altomare, A [1 ]
Bronco, S [1 ]
Oulderrahmania, L [1 ]
Masi, F [1 ]
机构
[1] Univ Pisa, Dipartimento Chim & Chim Ind, I-56126 Pisa, Italy
关键词
D O I
10.1002/1521-3900(200007)156:1<147::AID-MASY147>3.0.CO;2-R
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
After a short comparative analysis of different macromolecular ligands reported in the relevant literature, the presentation will be centered on the results obtained in the authors' laboratory using structurally defined inorganic supports in terms also of their macromolecular structure. Zeolites and mesomorphous silica can link, after proper chemical modification of their surface with MAO, unmodified metallocene complexes through cage entrapment and weak interactions, thus allowing the transfer from the solution to the solid phase. The metallocene complexes in their new phase are characterized by the catalytic behavior in olefin polymerization after activation with MAO. A decrease of productivity is generally observed depending on the type of support. The steric hindrance provided by the support is evidenced by the depression of chain transfer rate with formation of higher molecular weight polymers. Also shape selectivity is observed during copolymerization of ethylene with a-olefins having variable size. These steric effects are released when going from HY zeolite to MCM silica.
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页码:147 / 154
页数:8
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