Nanocomposites of polycarbonate (PC) reinforced with nanosized silica particles were prepared by a melt mixing technique in an internal mixer. Two kinds of commercial hydrophilic fumed silicas differing in their specific surface area were added in amounts up to 5% by volume, and their reinforcing action was compared to that of organically modified silica, loaded in the same amounts. Particle–matrix interactions were investigated by means of rheological and dynamic-mechanical thermal analysis, demonstrating the important role played by the organic modifi- cation in the interactions with the polymer matrix, and showing an optimal nano- particle loading around 2 vol%. The scratch resistance of the nanocomposites obtained from hydrophilic silicas was investigated, and a remarkable enhancement in the indenter’s penetration resistance was observed for all the compositions with respect to pristine PC. The same behaviour was observed for the Shore D hardness and for the impact resistance of the nanocomposites that also significantly improved with the maximum load shifting from a minimum value of 521 N for pristine PC up to values grater than 1330 N for the nanocomposites, demonstrating the activation of effective mechanisms of energy dissipation due to the presence of the nanofillers.
|Data di pubblicazione:||2011|
|Titolo:||Polycarbonate reinforced with silica nanoparticles|
|Autore/i:||A. S., Luyt; Messori, Massimo; Fabbri, Paola; J. P., Mofokeng; Taurino, Rosa; Zanasi, Tania; Pilati, Francesco|
|Digital Object Identifier (DOI):||10.1007/s00289-010-0408-5|
|Codice identificativo ISI:||WOS:000288333100011|
|Codice identificativo Scopus:||2-s2.0-79954587666|
|Citazione:||Polycarbonate reinforced with silica nanoparticles / A. S., Luyt; Messori, Massimo; Fabbri, Paola; J. P., Mofokeng; Taurino, Rosa; Zanasi, Tania; Pilati, Francesco. - In: POLYMER BULLETIN. - ISSN 0170-0839. - STAMPA. - 66(2011), pp. 991-1004.|
|Tipologia||Articolo su rivista|
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