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Compounding of MWCNTs with PS in a twin-screw extruder with varying process parameters

Morphology, interfacial behavior, thermal stability, rheology, and volume resistivity
: Sathyanarayana, S.; Olowojoba, G.; Weiss, P.; Caglar, B.; Pataki, B.; Mikonsaari, I.; Hübner, C.; Henning, F.


Macromolecular materials and engineering 298 (2013), Nr.1, S.89-105
ISSN: 1438-7492
ISSN: 1439-2054
European Commission EC
Fraunhofer ICT ()

1, 2, 3, 5, and 7.5 wt% MWCNTs are incorporated into PS in a twin-screw extruder at varying speeds, throughputs and extruder barrel temperatures. Increased SME at enhanced processing speeds seems to have the single largest effect in enhancing dispersion. A relative evaluation of PS/MWCNT interactions indicate an interfacial layer growth of 24% for 2 wt% MWCNT at 1100 rpm compared to 18% growth at 500 rpm. Raman analysis does not show an MWCNT peak shift but a constant increase in FWHM is observed irrespective of the MWCNT content. A significant enhancement of thermal stability occurs up to 2 wt% MWCNT loading while 1-2 wt% shows the rheological threshold. The volume resistivity decreases dramatically in a 2 wt% sample processed at 1100 rpm compared to those processed at 500 rpm.