Rubber-clay nanocomposites: from nanostructured to properties (Contributo in atti di convegno)

Type
Label
  • Rubber-clay nanocomposites: from nanostructured to properties (Contributo in atti di convegno) (literal)
Anno
  • 2007-01-01T00:00:00+01:00 (literal)
Alternative label
  • M.Galimberti, S.Senatore, A.Lostritto, L.Giannini, A.Spatola, G.Giuliano, G.Guerra, L.Conzatti, G.Costa (2007)
    Rubber-clay nanocomposites: from nanostructured to properties
    in Proceedings of Fall 172nd Technical Meeting of the Rubber Division, American Chemical Society, Cleveland (USA), 16-18 Ottobre
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • M.Galimberti, S.Senatore, A.Lostritto, L.Giannini, A.Spatola, G.Giuliano, G.Guerra, L.Conzatti, G.Costa (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#pagineTotali
  • 12 (literal)
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  • Conzatti, Costa ISMAC CNR Genova (literal)
Titolo
  • Rubber-clay nanocomposites: from nanostructured to properties (literal)
Abstract
  • In this contribution are discussed rubber-clay nanocomposites composed of a diene rubber and layered clays. Synthetic and natural poly-1,4-cis-isoprene and styrene/butadiene copolymers are used as the rubbers and a montmorillonite, either pristine or modified with a quaternary ammonium salt, is the layered clay. Montmorillonite was delaminated by compounding with either synthetic or natural poly-isoprene. Moreover, (00l) reflections in XRD patterns of both pristine and organo-modified MMT were found to reduce their intensity, with respect to (hk0) reflections, as they were mixed with the diene rubbers (styrene/butadiene as well), while their spacing remained unaltered, thus indicating a progressive reduction of the number of the packed clay-layers without any polymer intercalation. A delamination process is thus observed for nanocomposites in diene rubbers: complete separation between clay-layers can be thus achieved not only by the well-known intercalation-exfoliation mechanism. Reaction between pristine MMT and the organic modifier (OM) was performed by using rubber as a reaction medium. Unique results were obtained using natural polyisoprene: the basal spacing of the OM-intercalated structure prepared in this rubber was found to be nearly double with respect to the basal spacing of OM-intercalated clays obtained by direct treatment of MMT with OM in a polar solvent or in synthetic rubbers. Physical-mechanical testing of sulfur cured compounds showed a remarkable increase of storage modulus, an increase of thermoplasticity and of hysteresis as well as of Payne Effect. Rubber clay nanocomposites with organic-modifier-intercalated (OM-intercalated) crystalline structure seem thus to promote a higher dissipation of energy in sulfur cured compounds. (literal)
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