Chap._300010 - produce LLDPE with broad molecular weight...

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The catalytic site is well-defined (single) and can be manipulated their structures by the choice of ligands. The bridge between two ligands, shown in Kaminsky and Dow catalysts, forms constrained ligand geometry and results opened active site. Such a structure is favorable for insertion of large size of monomers, which is usually very difficult in Ziegler-Natta catalysts. * LLDPE Preparation Ziegler-Natta mutiple sites heterogeneous catalyst
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Unformatted text preview: produce LLDPE with broad molecular weight and composition distributions Metallocene single-site homogeneous catalyst produces LLDPE with narrow molecular and composition distribution R: -CH 2-CH 3 , -CH 2-CH 2-CH 2-CH 3 , -CH 2-CH 2-CH 2-CH 2-CH 2-CH 3 LLDPE R y x-(CH 2-CH 2 ) -(CH 2-CH) -Metallocene catalyst Ziegler-Natta catalyst R CH 2 =CH 2 + CH 2 =CH...
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This note was uploaded on 10/16/2010 for the course MATSE 441 taught by Professor Chung,tze-chiang during the Fall '10 term at Pennsylvania State University, University Park.

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