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Diethylbis(2,2′‐bipyridine)iron/MAO. A Very Active and Stereospecific Catalyst for 1,3‐Diene Polymerization
Author(s) -
Bazzini Cristina,
Giarrusso Antonino,
Porri Lido
Publication year - 2002
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(20021001)23:15<922::aid-marc922>3.0.co;2-s
Subject(s) - diene , isoprene , polymerization , stereospecificity , catalysis , polymer , polymer chemistry , bipyridine , 4,4' bipyridine , materials science , coordination polymerization , chemistry , copolymer , organic chemistry , natural rubber , radical polymerization , molecule , crystal structure , hydrogen bond
Diethylbis(2,2′‐bipyridine)Fe/MAO is an extremely active catalyst for the polymerization of 1,3‐dienes. Polymers with a 1,2 or 3,4 structure are formed from butadiene, isoprene, ( E )‐1,3‐pentadiene and 3‐methyl‐1,3‐pentadiene, while cis‐1,4 polymers are derived from 2,3‐dimethyl‐1,3‐butadiene. The 1,2 (3,4) polymers obtained at 25°C are amorphous, while those obtained below 0°C are crystalline, as was determined by means of X‐ray diffraction. Mechanistic implications of the results are briefly discussed.