Conformational Disorder in the Propagating Radical of Dimethacrylate Polymers (Articolo in rivista)

Type
Label
  • Conformational Disorder in the Propagating Radical of Dimethacrylate Polymers (Articolo in rivista) (literal)
Anno
  • 2002-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1163/156856702320267082 (literal)
Alternative label
  • Ferretti A.M., Costante G., Ponti A. (2002)
    Conformational Disorder in the Propagating Radical of Dimethacrylate Polymers
    in Research on chemical intermediates (Print)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Ferretti A.M., Costante G., Ponti A. (literal)
Pagina inizio
  • 159 (literal)
Pagina fine
  • 174 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 28 (literal)
Rivista
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Istituto di Scienze e Tecnologie Molecolari, Consiglio Nazionale delle Ricerche, Via Golgi 19, 20133 Milano, Italy, and Dipartimento di Chimica Fisica ed Elettrochimica, UniVersita` degli Studi di Milano, Via Golgi 19, 20133 Milano, Italy (literal)
Titolo
  • Conformational Disorder in the Propagating Radical of Dimethacrylate Polymers (literal)
Abstract
  • Photopolymerization of methacrylic monomers yields samples with trapped radicals that are easily detected by electron paramagnetic resonance (EPR) spectroscopy. Despite its simplicity, there is no general agreement about the interpretation of this spectrum, in particular, about the role of methylene ? protons. An extensive ENDOR study of the propagating radical in photopolymerized dimethacrylates has been carried out in order to obtain detailed information about methylene hyperfine couplings and, thus, about radical conformation. It is shown that literature models are not able to reproduce the ENDOR results and that only accurate fitting of ENDOR spectra obtained by saturating the EPR spectrum at different positions gives reliable information about radical conformation, thanks to the exploitation of conformational selectivity. It turns out that most radicals are in the minimum energy conformation, but any possible conformation is assumed by non negligible fractions of radical. (literal)
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