http://www.cnr.it/ontology/cnr/individuo/prodotto/ID201163
Cold cured epoxy-silica hybrids: effects of specimen thickness on the evolution of the Tg and observations on related phenomena (Articolo in rivista)
- Type
- Label
- Cold cured epoxy-silica hybrids: effects of specimen thickness on the evolution of the Tg and observations on related phenomena (Articolo in rivista) (literal)
- Anno
- 2011-01-01T00:00:00+01:00 (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
- 10.1002/pen.21817 (literal)
- Alternative label
M. Lettieri, F. Lionetto, M. Frigione, L. Prezzi, L. Mascia (2011)
Cold cured epoxy-silica hybrids: effects of specimen thickness on the evolution of the Tg and observations on related phenomena
in Polymer engineering and science (Online)
(literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
- M. Lettieri, F. Lionetto, M. Frigione, L. Prezzi, L. Mascia (literal)
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- Pagina fine
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- Rivista
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- Lettieri: CNR - Istituto per i Beni Archeologici e Monumentali;
Lionetto: Dipartimento di Ingegneria dell'Innovazione, Università del Salento;
Frigione: Dipartimento di Ingegneria dell'Innovazione, Università del Salento;
Prezzi: SAFE Marine Nanotechnologies, Ferentino (FR);
Mascia: Department of Materials, Loughborough University, UK (literal)
- Titolo
- Cold cured epoxy-silica hybrids: effects of specimen thickness on the evolution of the Tg and observations on related phenomena (literal)
- Abstract
- Experimental organic-inorganic hybrid systems, based on silane functionalized difunctional and trifunctional epoxy resins and an alkoxysilane precursor mixture, containing small amounts of ammonium molybdate, are evaluated for potential use as adhesives cured at ambient temperatures. The precursor resin mixtures are found to exhibit a large increase in viscosity with a pseudoplastic behavior. Scanning electron microscopy (SEM) analysis shows the existence of siloxane domains with nanometric dimensions, except for the presence of microscopic molybdate particles. By monitoring the evolution of the glass transition temperature (Tg) during curing, varying the thickness of the specimens between 0.2 and 4.5 mm, it is found that the organic-inorganic hybrids display a significant increase in the final Tg over the parent unmodified epoxy resins, particularly in thin specimens and when ammonium molybdate is added. Small-angle X-ray scattering (SAXS) spectra show that the dimensions and typographic
features of thick and thin specimens are similar, both containing an agglomeration of primary particles of 5-6 nm. (literal)
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- Autore CNR
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