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Highly active MgCl 2 ‐supported catalysts containing novel diether donors for propene polymerization
Author(s) -
Xu Demin,
Liu Zhongyang,
Zhao Jian,
Han Shimin,
Hu Youliang
Publication year - 2000
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 - 10.1002/1521-3927(20001001)21:15<1046::aid-marc1046>3.0.co;2-y
Subject(s) - propene , catalysis , polymerization , tacticity , polymer chemistry , alkyl , chemistry , chain transfer , fluorene , materials science , polymer , organic chemistry , radical polymerization
A new generation of MgCl 2 ‐supported catalysts for the polymerization of propene without any external donors was prepared. Two diethers, 9,9‐bis(methoxymethyl)fluorene (for Cat‐A) and 2,2‐dipropyl‐1,3‐dimethoxypropane (for Cat‐B) differing in the bulkiness of alkyl substituents in position 2, have been used as internal donors in MgCl 2 /TiCl 4 /diether‐AlR 3 catalysts. The weight‐average molecular weights produced with both catalysts were over 3.5×10 5 at low temperature in slurry polymerization (< 40°C). Cat‐A showed higher activity and produced higher isotactic polypropene than Cat‐B. The activity of both catalysts proved to be dependent on the temperature.