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 (alpha) 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.
|Titolo:||Radicals produced in the photopolymerization of multifunctional monomers, as probes of the polymeric structure|
SELLI, ELENA (Primo)
OLIVA, CESARE (Ultimo)
|Settore Scientifico Disciplinare:||Settore CHIM/02 - Chimica Fisica|
|Data di pubblicazione:||1996|
|Digital Object Identifier (DOI):||10.1002/macp.1996.021970206|
|Appare nelle tipologie:||01 - Articolo su periodico|