Copolymerisation of 1,3-Butadiene with Higher

Copolymers of butadiene with other conjugated dienes formed in the presence of coordination catalysts are characterised by a random distribution of comonomers [7]. 

In the copolymerisation of butadiene and isoprene with Ti-based catalysts, both monomeric units of the copolymers obtained are essentially of a ciy-1,4 structure the microstructure of monomeric units in the copolymers does not differ substantially from that in the homopolymers [196-198], Nd-based catalysts provide butadiene/isoprene copolymers with more than 95% cis-1,4 monomeric units [89,199,200], On the other hand, Co-based catalysts give copolymers in which the structure of the monomeric units depends markedly on copolymer composition [19,201,202], Similarly, the structure of the monomeric units depends on copolymer composition in copolymers of butadiene and 2,3-dimethylbutadiene obtained by copolymerisation with Co-based catalysts [201,203], 

The copolymerisation of butadiene and 1,3-pentadiene in the presence of V-based catalysts yields copolymers with a trans-1,4 structure of the butadiene units and a mixed trans-, M, 2 structure of the pentadiene units (in a ratio of 0.60-0.65/0.35-0.40 respectively) [61,204,205], 

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