Summary
The radical cyclopolymerization of N,N′-dimethyl-N,N′-dimethacrylurea (DMDMU) was investigated. The resulting polymer was completely soluble in benzene, and was found to compose of a seven-membered cyclized unit by means of IR and NMR spectra. This observation indicated that this cyclopolymerization was performed with alternating inter-and intra-molecular head-to-head (h-h) propagations, i.e. h-h cyclopolymerization mechanism to give a h-h cyclopolymer. When the cyclopolymer was heated, it was found to convert to a h-h cyclopolymer of N-methyl-N,N-dimethacrylamide(MDMA). The hydrolysis of the cyclopolymers of DMDMU and MDMA to h-h polymethacrylic derivatives was not succeeded.
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Otsu, T., Ohya, T. Head-to-head vinyl polymers. Polymer Bulletin 9, 355–360 (1983). https://doi.org/10.1007/BF00265313
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DOI: https://doi.org/10.1007/BF00265313