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B. Pączkowska, J. Pączkowski, D. C. Neckers

Studies of the kinetics of polyolmethacrylate polymerization by fluorescence probes.
Part III. Polymeric photoinitiators and coinitiators

Polimery 1994, No 9, 527


DOI: dx.doi.org/10.14314/polimery.1994.527

Summary

Changes in the fluorescence intensity and spectral characteristics of a fluorescent probe and FTIR spectroscopy have been used to follow the polymerization of polyolmethacrylates initiated by polymeric photoinitiators and acoinitiator. Polymerization photoinitiated by polymeric photoinitiator yields a more rigid polymer and gels are formed more rapidly than with the monomericinitiator analogs. The use of varied sequences of initiating radiation supports the conclusion that primary radicals formed during photoreduction of the visible photoinitiators are much less reactive in the case of the polymeric photoinitiator system. This causes a change from bimolecular to a unimolecular termination process. Fluorescence probe studies of the longterm postirradiation process were supplemented by FTIR studies which showed that the C=C conversion precedes the relaxation of free volume.


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