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Copolymerization of ethylene and 1‐hexene with supported metallocene catalysts: Effect of support treatment
Author(s) -
Kim Jung Dae,
Soares João B. P.
Publication year - 1999
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/(sici)1521-3927(19990601)20:6<347::aid-marc347>3.0.co;2-b
Subject(s) - metallocene , copolymer , gel permeation chromatography , ethylene , catalysis , 1 hexene , molar mass distribution , hexene , fractionation , materials science , post metallocene catalyst , polymer chemistry , crystallization , organic chemistry , chemical engineering , polymerization , chemistry , polymer , engineering
The effect of different catalyst support treatments in the 1‐hexene/ethylene copolymerization with supported metallocene catalysts was investigated through the analysis of molecular weight and chemical composition distributions by means of high temperature gel permeation chromatography (GPC) and crystallization analysis fractionation (CRYSTAF). The molecular weight distributions of all copolymers are narrow, indicating a uniform catalyst site. However, with respect to chemical composition distribution, some supported catalysts show broad and sometimes bimodal distributions, which indicates the presence of two or more active site types.