Premium
Radicals produced in the photopolymerization of multifunctional monomers, as probes of the polymeric structure
Author(s) -
Selli Elena,
Oliva Cesare
Publication year - 1996
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.1996.021970206
Subject(s) - photopolymer , photoinitiator , monomer , radical , polymerization , electron paramagnetic resonance , photochemistry , polymer chemistry , radical polymerization , polymer , chemistry , materials science , organic chemistry , nuclear magnetic resonance , physics
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 (α) 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.