Abstract
6,8-Dioxabicyclo[3.2.1]octane (DBO) was copolymerized with styrene in methylene chloride, 1-nitropropane, and toluene at various temperatures ranging from −78 to 25°C. Boron trifluoride etherate was used as an initiator. Sequence distributions of the monomeric units in the copolymers were determined by NMR analysis. It was found that the copolymerization in methylene chloride and 1-nitropropane gave copolymers with relatively short sequence lengths at higher temperatures, while it provided products with a highly block-like character at lower temperatures. In toluene solution, however, preferential polymerization of DBO occurred over the entire temperature range, yielding in most cases only the homopolymer of DBO. On the basis of these results, the structure and reactivity of the cationic growing chain-end of DBO were discussed.
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Okada, M., Sumitomo, H. & Hibino, Y. Polymerization of Bicyclic Acetals. III. Cationic Copolymerization of 6,8-Dioxabicyclo[3.2.1]octane with Styrene. Polym J 7, 511–518 (1975). https://doi.org/10.1295/polymj.7.511
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DOI: https://doi.org/10.1295/polymj.7.511