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Different half-sandwich titanium trifluorides and constrained geometry catalysts of titanium and vanadium were used to polymerize butadiene, isoprene, and 1,3-pentadiene. The polybutadienes produced with these catalysts have nearly identical microstructures of about 80% 1,4-cis, 1% 1,4-trans and 19% 1,2-linked units. An optimum activity is obtained by an aluminium/titanium ratio of about 700. There...
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