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Copolymerization of Ethylene and α ‐Olefin Using Et(Ind) 2 ZrCl 2 Entrapped inside the Regular and Small Pores of MCM‐41
Author(s) -
Ko Young Soo,
Woo Seong Ihl
Publication year - 2001
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/1521-3935(20010301)202:5<739::aid-macp739>3.0.co;2-h
Subject(s) - comonomer , copolymer , ethylene , polymer chemistry , olefin fiber , metallocene , polymerization , chemistry , materials science , catalysis , organic chemistry , polymer
Copolymerizations of ethylene with propylene, and ethylene with 1‐octadecene were performed with MCM‐41/MAO/Et(Ind) 2 ZrCl 2 and the resulting copolymers were analyzed by NMR, GPC, and DSC. A comonomer enhancement effect was observed in the case of ethylene‐propylene copolymerization with both supported and unsupported catalysts. However, it was not observed in the case of ethylene‐1‐octadecene copolymerization with MCM‐41/MAO/Et(Ind) 2 ZrCl 2 , while unsupported Et(Ind) 2 ZrCl 2 showed the comonomer enhancement effect under the same polymerization conditions. Propylene content in the copolymer of MCM‐41/MAO/Et(Ind) 2 ZrCl 2 was higher than that of unsupported Et(Ind) 2 ZrCl 2 , suggesting the presence of more stereoregulating active sites and lower concentration of MAO around active sites inside the pores of MCM‐41.