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The cyclic oligomers which are formed during the cationic copolymerization of oxetane (1) with 3,3‐dimethyloxetane (2) were analyzed qualitatively and quantitatively by means of gas chromatography and mass spectroscopy. Cyclic oligomers from trimer up to octamer were detected but, as with the homopolymerizations, the cyclic tetramers were the most abundant. The relative abundances of the different tetramer co‐oligomers were compared with the theoretical abundances, calculated from the reactivity parameters of the copolymerization and the monomer feed ratio, using the method of Ito and Yamashita. There was no agreement between the calculated and experimental values. This was attributed to a lower tendency to cyclize for polymer chains having a 2‐oxonium chain end compared with polymer chains having a 1‐oxonium chain end.
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Bucquoye et al. (1981) studied this question.
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