Abstract
Abstract The γ-ray irradiation of a solid solution of 3-chloromethyl-3-ethyloxetane and 3,3-bis-(chloromethyl)oxetane has given a copolymer with the same composition as that of the initial monomer mixture, while a BF3-catalyzed copolymerization has formed a copolymer with a different composition from that of the initial monomer mixture. In the polymerization, the solid solution has behaved like each single component crystal in respect to the relation of polymer yield to the irradiation temperature and to the crystal state of the monomers. The copolymer obtained from small crystals grown by rapid cooling has been found to have a narrower distribution of composition than that obtained from large crystals. With a solid solution of 3-chloromethyl-3-ethyloxetane and 3-fluoromethyl-3-ethyloxetance, the polymerization has been studied and similar results obtained. The mixed crystal of 3-chloromethyl-3-ethyl oxetane and diketene gives a polymer blend. The curve of the polymer yield versus the irradiation temperature is a superposition of those in the each component crystal. The mixed crystal of 3-chloromethyl-3-ethyloxetane and trioxane gives only a homopolymer of oxetane, and the temperature dependence of the yield is similar to that of oxetane, even in an eutectic composition.
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