The reinforcement of polymers by adding nanoscopic layered silicates is very promising in the production of high-performances plastics. The fundamental length scales dominate the morphology of polymer-layered silicate nanocomposites and the uniform dispersion of nanoscopically sized particles can lead a very large interfacial area with bulk properties synergically derived from raw components. The aim of this study is to investigate the feature of the elongational flow-induced structure formation of nanocomposites and to correlate the mechanical properties of the hybrids to the resulting nanomorphology. In particular, the present work focuses on the modelling of mechanical behaviour of polyamide based nanocomposite fibers, which were produced by fiber spinning technique and collected at different draw ratios. Tensile properties of the produced fibers were investigated and correlated to their nanostructure through analytical techniques sensitive to different aspects of the hybrids morphology, such as DSC, X-Ray diffraction and TEM analysis. Finally, the Halpin-Tsai method was applied to calculate the modulus of the nanocomposite fibers at different draw ratios, as a function of various parameters, including the exfoliation ratio, clay layer and cluster aspect ratios. Since all hybrids studied in this work were characterized by intercalated/exfoliated morphology, the calculation, using the Halpin-Tsai method, was divided into two stages. The Young’s modulus for the exfoliated region was computed first by considering this region as a two-phase system: the neat matrix and the exfoliated clay platelets. The exfoliated region with the computed Young’s modulus was then considered as the effective matrix phase in the second stage of calculation, in which the intercalated region was the inclusion phase.

Modelling of mechanical behaviour of polyamide based nanocomposite fibers

GAROFALO, EMILIA;DI MAIO, Luciano;INCARNATO, Loredana
2007-01-01

Abstract

The reinforcement of polymers by adding nanoscopic layered silicates is very promising in the production of high-performances plastics. The fundamental length scales dominate the morphology of polymer-layered silicate nanocomposites and the uniform dispersion of nanoscopically sized particles can lead a very large interfacial area with bulk properties synergically derived from raw components. The aim of this study is to investigate the feature of the elongational flow-induced structure formation of nanocomposites and to correlate the mechanical properties of the hybrids to the resulting nanomorphology. In particular, the present work focuses on the modelling of mechanical behaviour of polyamide based nanocomposite fibers, which were produced by fiber spinning technique and collected at different draw ratios. Tensile properties of the produced fibers were investigated and correlated to their nanostructure through analytical techniques sensitive to different aspects of the hybrids morphology, such as DSC, X-Ray diffraction and TEM analysis. Finally, the Halpin-Tsai method was applied to calculate the modulus of the nanocomposite fibers at different draw ratios, as a function of various parameters, including the exfoliation ratio, clay layer and cluster aspect ratios. Since all hybrids studied in this work were characterized by intercalated/exfoliated morphology, the calculation, using the Halpin-Tsai method, was divided into two stages. The Young’s modulus for the exfoliated region was computed first by considering this region as a two-phase system: the neat matrix and the exfoliated clay platelets. The exfoliated region with the computed Young’s modulus was then considered as the effective matrix phase in the second stage of calculation, in which the intercalated region was the inclusion phase.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11386/3018822
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