Abstract
α-Methylstyrene(α-MeSt) and 2, 3-dimethylbutadiene (DMB) were copolymerized in THF and in hydrocarbon solvents with n-BuLi. The copolymer produced at 60°C in THF was composed of almost equimolar amounts of α-MeSt and DMB, if α-MeSt was charged in excess. In the copolymer α-MeSt and DMB were considered to be arranged alternately, and DMB was incorporated in the form of 1, 4-structure. In the copolymerization below 60°C the copolymer composition was affected by the ratio of initial monomer concentrations. The content of α-MeSt in the copolymer increased with decreasing polymerization temperature and reached 91% at −78°C. The copolymerization at 30°C gave the copolymer composed of (2:1) α-MeSt and DMB under the existence of large excess of α-MeSt. It was presumed that the major part of the copolymer was composed of repeated sequences of [α-MeSt·α·MeSt·DMB]. In benzene a copolymer rich in DMB (71%) was obtained at 60°C. The addition of THF to the polymerization system in benzene decreased the content of DMB.
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Yuki, H., Okamoto, Y., Takano, H. et al. Anionic Copolymerization of α-Methylstyrene and 2, 3-Dimethylbutadiene. Polym J 3, 442–447 (1972). https://doi.org/10.1295/polymj.3.442
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DOI: https://doi.org/10.1295/polymj.3.442