Abstract
Abstract The copolymerizations of styrene and α-methylstyrene in liquid sulfur dioxide have been carried out at −40°C using boron trifluoride etherate as a catalyst, and the results compared with the same copolymerizations in methylene dichloride at −20°C. The r1 and r2values have been estimated by NMR spectrometry as 0–0.1 and over 20 in liquid sulfur dioxide, and 0.2–0.3 and 12±2 in methylene chloride. The styrene unit sandwiched between two α-methylstyrene units has been calculated by a comparison of the phenyl doublet with phenyl singlet absorptions. The (S) per cent (S is the sandwiched styrene sequence, M–St–M, in the copolymer, where St is the styrene unit and M is the α-methylstyrene unit) has been estimated. In liquid sulfur dioxide, S is approximately zero. This fact agrees well with the large r2 value. The reason for such a non-alternative nature of the copolymerization in liquid sulfur dioxide had also been discussed.
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