Thermal Decay of Trapped Radicals Produced During the Photopolymerization of Diacrylates (Articolo in rivista)

Type
Label
  • Thermal Decay of Trapped Radicals Produced During the Photopolymerization of Diacrylates (Articolo in rivista) (literal)
Anno
  • 1990-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1039/FT9908603273 (literal)
Alternative label
  • lgnazio Renato Bellobono, Cesare Oliva, Roberto Morelli, Elena Selli, Alessandro Ponti (1990)
    Thermal Decay of Trapped Radicals Produced During the Photopolymerization of Diacrylates
    in Journal of the Chemical Society. Faraday transactions (Print)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • lgnazio Renato Bellobono, Cesare Oliva, Roberto Morelli, Elena Selli, Alessandro Ponti (literal)
Pagina inizio
  • 3273 (literal)
Pagina fine
  • 3277 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 86 (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Dipartimento di Chimica Fisica ed Elettrochimica e Centro C.N.R. CSRSRC, Universita' di Milano, via Golgi 19, I20133 Milano, Italy (literal)
Titolo
  • Thermal Decay of Trapped Radicals Produced During the Photopolymerization of Diacrylates (literal)
Abstract
  • Direct evidence of the presence of extremely long-lived radicals produced in the photopolymerization of 1,6-hexanediol diacrylate and tetraethyleneglycol diacrylate has been obtained by EPR spectroscopy. As radical decay in thermal after-treatment is accompanied by additional polymerization and cross-linking, kinetic studies were carried out at different temperatures (40-120 °C) both by EPR spectroscopy and by analysis of the parallel disappearance of double bonds. Apart from EPR data at 120 °C, all experimental results show that both radical decay and double-bond conversion are first-order reactions, and kinetic constants evaluated for the two processes are practically coincident at the same temperature. Activation parameters for thermal after-treatment of the two diacrylates are almost the same, owing to the similarity in their chain length and mobility. The behaviour of the system at 120 °C, accounted for by a multiple relaxation model, is interpreted as being due to prevailing cross-linking reactions in the vitrified network of trapped radicals. (literal)
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