Polymerization kinetics and characterization of dual cured polyurethane-acrylate nanocomposites for laminates (Articolo in rivista)

Type
Label
  • Polymerization kinetics and characterization of dual cured polyurethane-acrylate nanocomposites for laminates (Articolo in rivista) (literal)
Anno
  • 2005-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1002/mame.200400341 (literal)
Alternative label
  • M. Bertoldo1, S. Bronco1, P. Narducci2, S. Rossetti3, M. Scoponi3 (2005)
    Polymerization kinetics and characterization of dual cured polyurethane-acrylate nanocomposites for laminates
    in Macromolecular materials and engineering (Print)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • M. Bertoldo1, S. Bronco1, P. Narducci2, S. Rossetti3, M. Scoponi3 (literal)
Pagina inizio
  • 475 (literal)
Pagina fine
  • -- (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 290 (literal)
Rivista
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • 1 POLYLAB-INFM, c/o Dip. Chimica e Chim. Ind.le, Universita` di Pisa, Via Risorgimento 35, 56126 Pisa, Italy 2 Dipartimento di Ingegneria Chimica, Universita` di Pisa, via Diotisalvi 2 35, 56126 Pisa, Italy 3 ISOF-CNR, sez. Ferrara, c/o Dipartimento di Chimica dell'Universita`, Via Borsari 46, 44100 Ferrara, Italy (literal)
Titolo
  • Polymerization kinetics and characterization of dual cured polyurethane-acrylate nanocomposites for laminates (literal)
Abstract
  • Four different types of montmorillonites have been dispersed by sonication at 50 8C into a propoxylated aromatic epoxy diacrylate oligomer to achieve interlayered or exfoliated nanocomposites. A thermally-induced cross-linking reaction, forming a polyurethane network in the presence of 7 wt.-% of a montmorillonite, has been promoted by addition of an allophanate modified polyisocyanurate based on hexamethylene diisocyanate. The kinetic behavior of the network formation has been studied at 25, 40 and 60 ° C by following the disappearance of the isocyanate vibrational band found at 2 270 cm?1 . A tight crosslinked polyurethane acrylate network has been achieved by a subsequent dual UV curing promoted by a photoinitiator mixture (0.6 wt.-%) added to the reactive mixture because of further reactions occur to the acrylate double bonds. The photopolymerization kinetic has been investigated on the different thermally treated polyurethane nanocomposite networks by Real Time FTIR spectroscopy monitoring the changes of the IR band at 810 cm?1 assigned to the acrylate double bond vibrations. The influence of the different montmorillonite clays on the final nanocomposite morphology has been investigated by using XRD and SEM. Finally, the use of these mixtures as internal layer between two modified surface PET films has been also studied for the laminate production. The based-PET laminate films have been characterized by determining the bending resistance and optical properties as a function of different nanofillers. (literal)
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