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Living polymerization of propylene and 1‐hexene using bis‐Cp type metallocene catalysts
Author(s) -
Fukui Yoshifumi,
Murata Masahide,
Soga Kazuo
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(19991201)20:12<637::aid-marc637>3.0.co;2-n
Subject(s) - polymerization , metallocene , polymer chemistry , molar mass distribution , living polymerization , hexene , polypropylene , polymer , materials science , coordination polymerization , catalysis , 1 hexene , solution polymerization , chemistry , radical polymerization , organic chemistry , composite material , copolymer
To check the possibility of living polymerization with a biscyclopentadienyl metallocene, propylene polymerization was conducted by Cp 2 ZrMe 2 at –78°C or Cp 2 HfMe 2 at –50°C using B(C 6 F 5 ) 3 and AlOct 3 as a cocatalyst. The polymer yield increased linearly with polymerization time. The polypropylene obtained showed narrow molecular weight distribution ( M w / M n 1.04–1.15). In addition, the number‐average molecular weight increased in proportion to the polymerization time. It was, thus, found that living polymerization of propylene proceeds with the catalyst systems at a very low temperature. Isospecific living polymerization of 1‐hexene also proceeded with the rac‐(et)Ind 2 ZrMe 2 catalyst at –78°C.