Abstract
Copolymerization of ethene and 1,3-butadiene was conducted over SiO2-supported CpTiCl3 catalyst using Ph3CB(C6F5)4 or B(C6F5)3 combined with triisobutylaluminium (iBu3Al) or trioctylaluminium (Oct3Al). When the copolymerization was carried out at 0°C, the Ph3CB(C6F5)4/iBu3Al and B(C6F5)3/Oct3Al systems selectively produced copolymers which contained about 0.5–2.5 mol-% of trans-1,4-inserted butadiene units. The number-average molecular weight (Mn) of the copolymers was around 80 000 with polydispersities in the range from 6 to 8. Oxidative degradation of the vinylene units with potassium permanganate decreased the Mn values to several thousands with polydispersities of ca. 2. This indicates that the butadiene units are randomly distributed in the copolymers. NMR analysis clarified that the decomposed product is a polyethene with carboxyl groups at both chain ends.
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