Homopolymerization of a styrene-terminated polyisoprene macromonomer (SIPM) by half-titanocene catalysts in combination with methylaluminoxane (MAO) was investigated. Polymerization of the SIPM with CpTiCl3-MAO as the catalyst was found to proceed readily to give a high molecular weight polymer. 1H and 13C NMR spectra of the poly(SIPM) after ozonolysis of the isoprene side chain revealed that poly(SIPM) is a highly syndiotactic polymer. Syndiotactic poly(SIPM) is soluble in usual solvents in spite of having highly syndiotactic sequences on its main chain and a considerable degree of polymerization.
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Senoo et al. (2000) studied this question.