Summary
The cationic polymerization of 3,3-diethyloxetane leads to a mixture of polymer and cyclic oligomers. The cyclic tetramer is the most important oligomer and is formed in 20–35% yield. This behaviour is almost identical to that of the unsubstituted oxetane and 3,3-dimethyloxetane. The monomer consumption shows two distinct stages: a very fast stage is followed by a slow stage, leading to complete conversion. The cyclic oligomers are formed only during the second stage.
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References
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Bucquoye, M.R., Goethals, E.J. Cyclic oligomers in the cationic polymerization of 3,3-diethyloxetane. Polymer Bulletin 2, 707–712 (1980). https://doi.org/10.1007/BF00254456
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DOI: https://doi.org/10.1007/BF00254456