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Rheological behaviour of nano-composites based on polyamide 6 under shear and elongational flow at high strain rates
Authors:Francesco Baldi  Anika Franceschini  Fabio Bignotti  Giuseppe Tieghi  Theonis Riccò
Affiliation:(1) Dipartimento di Chimica e Fisica per l’Ingegneria e per i Materiali, Università degli Studi di Brescia, Via Valotti 9, Brescia, 25123, Italy;(2) Dipartimento di Chimica, Materiali e Ingegneria Chimica “Giulio Natta”, Politecnico di Milano, Piazza Leonardo da Vinci 32, Milano, 20133, Italy
Abstract:In this work, the rheological behaviour of high molecular mass polyamide 6 (PA6)/organo-montmorillonite nano-composites, obtained via melt blending, was investigated under shear and extensional flow. Capillary rheometry was used for the measurement of high shear rate steady state shear viscosity and die entrance pressure losses; further, by the application of a converging flow method (Cogswell model) to these experimental results, elongational viscosity data were indirectly calculated. The extensional behaviour was directly investigated by means of melt spinning experiments, and data of apparent elongational viscosity were determined. The results evidenced that the presence of the organo-clay in filled PA6 melts modifies the rheological behaviour of the material, with respect to the unfilled polymer, in dependence on the type of flow experienced by the fluid. In shear flow, the nano-composites showed a slightly lower viscosity than neat PA6, whereas in elongation, they appeared much more viscous, in dependence on the organo-clay content.
Keywords:Nanocomposites  Polyamide 6 (PA6)  Organo-clay  Capillary rheometry  Melt spinning experiments
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