Summary
The cationic polymerization of typical monomers, e.g. of oxiranes such as cyclohexene oxide and 1,4-butanedioldiglycidyl ether or of vinyl ethers such as n-butylvinyl ether, is induced by UV irradiation of monomer formulations containing a substituted vinyl bromide as light absorbing agent and an appropriate non-absorbing onium salt. Experiments performed with 1,2,2-triphenyl vinyl bromide or 1,2,2-tri(4-methoxyphenyl) vinyl bromide and N-ethoxy-2-methyl-pyridinium or triphenyl sulfonium hexafluorophosphate are described in the paper.
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Johnen, N., Kobayashi, S., Yagci, Y. et al. Substituted vinyl bromides as photoinitiators for cationic polymerizations. Polymer Bulletin 30, 279–284 (1993). https://doi.org/10.1007/BF00343061
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DOI: https://doi.org/10.1007/BF00343061