Propagation radicals generated during the photopolymerization and photo-cross-linking of a trimethacrylate and a vinylmethacrylate monomer have been characterized by EPR and ENDOR spectroscopy at different temperatures. Also, radical decay has been investigated at 363-423 K. The EPR spectral shape reflects a fast exchange process between two radical conformations and is sensitive to the mobility of the polymeric structure surrounding radicals. ENDOR spectra show H-1-matrix lines and a band around 45 MHz, which has been attributed to the interaction of the unpaired electron with the hydrogen nuclei of a freely rotating methyl group. Radical decay and dynamic phenomena involving radicals have been interpreted in the light of a dispersive kinetic model, which allows the evaluation of useful parameters for polymer characterization.
ELECTRON-PARAMAGNETIC-RESONANCE AND ELECTRON-NUCLEAR DOUBLE-RESONANCE CHARACTERIZATION OF RADICALS IN PHOTOPOLYMERIZED MULTIFUNCTIONAL METHACRYLATES / C. OLIVA, E. SELLI, S. DIBLAS, G. TERMIGNONE. - In: JOURNAL OF THE CHEMICAL SOCIETY-PERKIN TRANSACTIONS II. - ISSN 0300-9580. - :12(1995), pp. 2133-2139.
Titolo: | ELECTRON-PARAMAGNETIC-RESONANCE AND ELECTRON-NUCLEAR DOUBLE-RESONANCE CHARACTERIZATION OF RADICALS IN PHOTOPOLYMERIZED MULTIFUNCTIONAL METHACRYLATES | |
Autori: | OLIVA, CESARE (Primo) SELLI, ELENA (Secondo) TERMIGNONE, GIORGIO (Ultimo) | |
Settore Scientifico Disciplinare: | Settore CHIM/02 - Chimica Fisica | |
Data di pubblicazione: | 1995 | |
Rivista: | ||
Tipologia: | Article (author) | |
Digital Object Identifier (DOI): | http://dx.doi.org/10.1039/p29950002133 | |
Appare nelle tipologie: | 01 - Articolo su periodico |