Premium
Coordination copolymerization of butadiene and isoprene with rare earth chloride–alcohol–aluminum trialkyl catalytic systems
Author(s) -
Zhiquan Shen,
Xiangyu Song,
Shuxiu Xiao,
Jipo Yang,
Xianglan Kan
Publication year - 1983
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1983.070280504
Subject(s) - isoprene , copolymer , polymerization , monomer , reactivity (psychology) , catalysis , polymer chemistry , chemistry , lanthanide , chloride , materials science , organic chemistry , polymer , medicine , alternative medicine , pathology , ion
Butadiene and isoprene were copolymerized with LnCl 3 –ROH–AIR 3 catalytic system. The products obtained were confirmed to be copolymers by their glass transition temperatures and characteristic pyrolytic chromatograms, etc. The equation for copolymerization rate may be expressed as R p = K p ( M ) 2 (cat). The rate constants of copolymerization, activation energy, and monomer reactivity ratios for catalytic systems containing various rare earth elements in III‐B family and different solvents were determined. It was found that the reactivity ratio of butadiene was greater than that of isoprene and r 1 r 2 near 1, and the composition and microstructure of copolymers were not much affected by variation of polymerization conditions. Both monomer repeat units in the copolymers had cis ‐1,4 contents above 95%, which is a distinguishing feature of coordination polymerization with the lanthanide catalyst system.