Abstract
Full Paper: Polymerization of butadiene (Bd) with V(acac)3-methylaluminoxane (MAO) catalyst was investigated. The microstructure of the polymer was found to depend strongly on the polymerization conditions. High polymerization temperature and high MAO/V(acac)3 mole ratios were preferential to produce cis-1,4 structure. Two kinds of active species were presumed from the GPC measurement of the polymers; one gives a high molecular weight polymer bearing high cis-1,4 content, another affords a low molecular weight polymer with high trans-1,4 content. A Solvent effect was observed. A polymer consisting of mainly trans-1,4 unit was produced in CH2Cl2 in contrast to toluene and n-heptane in which polymers consisting of mainly cis-1,4 structure were observed. The addition of ethyl benzoate, triethylamine, chloranil, and tetracyanoquinodimethane to the V(acac)3-MAO catalyst gave an influence to not only the activity for the polymerization but also the microstructure of the polymer.
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