Twin-Screw compounding extrusion of Polystyrene (PS)/Multi walled carbon nanotube (MWCNT) nanocomposites with varying process: Comprehensive integration of morphology, interfacial behavior, thermal stability, rheology and electrical resistivity

Sathyanarayana, Shyam and Olowojoba, Ganiu and Weiss, Patrick and Pataki, Bernadeth and Mikonsaari, Irma and Hübner, Christof and Henning, Frank (2013) Twin-Screw compounding extrusion of Polystyrene (PS)/Multi walled carbon nanotube (MWCNT) nanocomposites with varying process: Comprehensive integration of morphology, interfacial behavior, thermal stability, rheology and electrical resistivity. MACROMOLECULAR MATERIALS AND ENGINEERING, 298 (1). pp. 89-105. ISSN 1438-7492

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Abstract

PS was compounded with MWCNT loadings of 1,2,3,5 and 7.5 wt.% at varying speeds, throughputs and extruder barrel temperatures. High SME inputs at enhanced processing speeds seem to have had the single largest effect in enhancing dispersion. Relative evaluations of PS-MWCNT interaction indicate an interphasial layer growth of 24% for 2 wt.% MWCNT additions at 1100 rpm compared to 18% growth at 500 rpm. Raman analysis does not show MWCNT peak shift when incorporated into PS but a constant increase in FWHM is observed irrespective of the MWCNT content. Significant enhancement in thermal stability occurs up to 2 wt.% MWCNT loading while 1-2 wt.% shows the rheological threshold. A drop in 10 orders of magnitude of volume resistivity is achieved on a 2 wt.% sample processed at 1100 rpm compared to those processed at 500 rpm and these do not differ by much to those achieved with higher MWCNT contents.

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