Abstract
1. The possibility of polymerizing 1,2-dimethylenecyclobutane with organolithium initiators has been demonstrated. The microstructure of the polymers obtained is determined by the nature of the solvent; in a hydrocarbon medium the 1,4-structural unit is mainly. formed, while in a polar solvent the 1,2-structural unit predominates. 2. The anionic copolymerization constants of 1,2-dimethylenecyclobutane with butadiene in hydrocarbon and polar media have been determined.
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