Polymerizations of 1,3-Cyclohexadiene, in the presence of Cp2Ni (Cp = cyclopentadienyl) activated by methylaluminoxane (MAO), were carried out at different temperatures and Ni-MAO mole ratios. The polymers obtained are stereoregular with a 1–4 structure, and are highly crystalline with a melting point close to 315°C. Copolymerizations of 1,3-cyclohexadiene and butadiene with the title catalyst give polymers with a nearly random distribution of the comonomeric units.
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Longo et al. (2001) studied this question.
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