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2,3-Dihydro-4H-pyran, DHP, and 2,3-dihydrofuran, DHF, are photopolymerized at ambient temperature with the aid of diphenyl iodonium hexafluorophosphate, Ph 2 I + PF 6− or triphenyl sulfonium hexafluorophosphate, Ph 3 S + PF 6− at λ inc = 310 or 340 nm, respectively. DHP is photopolymerized in bulk with the aid of Ph 2 I ...
The cationic bulk polymerization of oxiranes such as cyclohexene oxide and 4-vinyl cyclohexene dioxide can be induced by light in the visible wavelength range with the aid of an initiator system consisting of an onium salt and a coumarin (appropriate for applications of lasers emitting light between 400 and 500 nm). This was demonstrated by irradiating neat monomers containing either coumarin 153...
The photoinitiation of the polymerization of bulk cyclohexene oxide (CHO) containing N-ethoxy-2-methyl pyridinium hexafluorophosphate (EMP + PF 6− ) and either anthracene or thioxanthone (TX) at λ inc> 340 nm was studied. Regarding the action of anthracene it is notable that upon u.v. irradiation of a CHO solution of poly(tetrahydrofuran) bearing terminal anthryl groups...
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