Crystallization behaviour of new poly(tetramethyleneterephthalamide) nanocomposites containing SiO2 fillers with distinct morphologies

resumo

Polyamide-based nanocomposites containing surface-modified SiO2 nanofillers with different morphologies were prepared by in situ polymerisation. The nanocomposites microstructure was investigated by scanning electron microscopy, which showed a high degree of dispersion of the fillers. The isothermal crystallization kinetics, recorded with a differential scanning calorimeter, has shown a strong influence of the nanofillers morphology on the poly(tetramethyleneterephthalamide) crystallization behaviour. The strong nucleating effect of the inorganic substrate is interpreted as the combined result of a lower activation energy for the primary nucleation and a higher activation energy for the transport of chain stems to the growing lamellae. (C) 2004 Elsevier Ltd. All rights reserved.

palavras-chave

IN-SITU POLYMERIZATION; SILICA NANOCOMPOSITES; COMPOSITE-MATERIALS; THERMAL-STABILITY; NANOPARTICLES

categoria

Engineering; Materials Science

autores

Esteves, ACC; Barros-Timmons, AM; Martins, JA; Zhang, W; Cruz-Pinto, J; Trindade, T

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