1976 Volume 1976 Issue 8 Pages 1285-1290
Some hydrocarbons having 1, 4-diene structure e. g., 1, 4-hexadiene (HD), were found to be effective moderators for adjusting the molecular weight in the polymerization of conjugated diene catalyzed by Alfin. The molecular weight adjusting effect of 1, 4-diene is not found in other polymerizations without using Alfin catalyst. The molecular weight of the polymer formed is adjusted by the amount of 1, 4-diene used and is almost unchanged throughout the polymerization.
The copolymerizations of butadiene with styrene or isoprene give random copolymers. After completion of the polymerization, almost all HD are recovered by distillation from the polymerization mixture and are effectively reused as a moderator for the polymerization.
The polymer obtained shows excellent mechanical properties, especia lly toward abrasion loss, than the usual rubbers.
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