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Radicals produced in the photopolymerization of multifunctional monomers, as probes of the polymeric structure

✍ Scribed by Elena Selli; Cesare Oliva

Publisher
John Wiley and Sons
Year
1996
Tongue
English
Weight
590 KB
Volume
197
Category
Article
ISSN
1022-1352

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✦ Synopsis

Abstract

The EPR spectra of radicals produced during the photoinduced polymerization and cross‐linking of multifunctional acrylic and methacrylic monomers are sensitive to the mobility of the polymeric surroundings. An analysis of the rate of decay of radicals trapped in different environments is reported, with the aim of finding a correlation between the evolution of the EPR spectral shape and the characteristics of the polymeric structure. A dispersive kinetic model was found to be suitable for the interpretation of radical decay results, in terms of a rate parameter (B) and a dispersion parameter (Ξ±) which takes into account the disorder of the system. These parameters depend on radical decay temperature and reflect the properties and the mobility of the photopolymerized networks, in relation to the monomer structure and to photopolymerization conditions, such as irradiation time and photoinitiator content.

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