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Combined metallocene catalysts: an efficient technique to manipulate long‐chain branching frequency of polyethylene
Author(s) -
Beigzadeh Daryoosh,
Soares João B. P.,
Duever Thomas A.
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(19991001)20:10<541::aid-marc541>3.0.co;2-e
Subject(s) - methylaluminoxane , branching (polymer chemistry) , polyethylene , metallocene , gel permeation chromatography , borane , catalysis , polymer chemistry , ethylene , polymerization , molar mass distribution , materials science , chemistry , polymer , organic chemistry
The solution polymerization of ethylene in Isopar E in a semi‐batch reactor using combined CGC‐Ti and Et[Ind] 2 ZrCl 2 catalysts was studied. Methylaluminoxane (MAO) and tris(pentafluorophenyl)borane were used as co‐catalysts. Samples were analyzed by 13 C NMR and gel permeation chromatography (GPC) for their branching content and molecular weight distribution. It was shown that there was an optimum ratio of CGC‐Ti/Et[Ind] 2 ZrCl 2 that maximizes the number of long‐chain branches of the formed polyethylene.