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Efficiencies of various metallocene/reducing agent catalyst systems in the hydrogenation of polystyrene‐ b ‐polybutadiene‐ b ‐polystyrene block copolymers
Author(s) -
Yang WenShen,
Hsieh Henry ChiChen,
Tsiang Raymond ChienChao
Publication year - 1999
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/(sici)1097-4628(19990628)72:14<1807::aid-app2>3.0.co;2-p
Subject(s) - polybutadiene , cobaltocene , copolymer , butyllithium , polystyrene , polymer chemistry , metallocene , materials science , cyclopentadienyl complex , catalysis , chemistry , organic chemistry , polymer , polymerization
Various metallocenes, including bis(η 5 ‐cyclopentadienyl)cobalt, bis(η 5 ‐cyclopentadienyl)nickel, and bis(η 5 ‐cyclopentadienyl)titanium dichloride, combined with various reducing agents, including n ‐butyllithium, phenyllithium, and triethylaluminum, have been evaluated for their catalytic efficiencies in the hydrogenation of polystyrene‐ b ‐polybutadiene‐ b ‐polystyrene (SBS) block copolymer. The efficiencies were determined by monitoring the extent of saturation of double bonds on the polybutadiene segment of the copolymer using FTIR and 1 H‐NMR spectroscopy. The cobaltocene/ n ‐butyllithium catalyst system was found the most active. The effects of H 2 pressure and the ratio of n ‐butyllithium to cobaltocene ratio on the hydrogenation efficiency were also investigated. © 1999 John Wiley & Sons, Inc. J Appl Polym Sci 72: 1807–1815, 1999