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Chromium Catalysts for Butadiene and Norbornene Polymerization
Author(s) -
Ricci Giovanni,
Boglia Aldo,
Boccia Antonella Caterina,
Zetta Lucia
Publication year - 2008
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.200751425
Subject(s) - norbornene , tacticity , polymerization , chromium , polymer chemistry , materials science , polymer , phosphine , catalysis , olefin polymerization , coordination polymerization , chemistry , organic chemistry , solution polymerization , composite material , metallurgy
A new class of chromium catalysts were obtained by combining bidentate phosphine chromium(II) complexes with methylaluminoxanes. These systems were found to be very active in the polymerization of butadiene giving 1,2 polymers having different tacticity (iso or syndio) depending on the type of phosphine bonded to the chromium atom. Moreover, they were also able to polymerize norbornene, giving crystalline all exo ‐enchained vinyl addition polymers, exhibiting a rather unusual structure in the field of olefin stereospecific polymerization, namely diheterotactic structure, characterized by regular sequences of ( mr ) atactic triads.