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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
Author(s) -
Sathyanarayana Shyam,
Olowojoba Ganiu,
Weiss Patrick,
Caglar Burak,
Pataki Bernadeth,
Mikonsaari Irma,
Hübner Christof,
Henning Frank
Publication year - 2013
Publication title -
macromolecular materials and engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.913
H-Index - 96
eISSN - 1439-2054
pISSN - 1438-7492
DOI - 10.1002/mame.201200018
Subject(s) - materials science , plastics extrusion , rheology , composite material , compounding , thermal stability , volume (thermodynamics) , dispersion (optics) , extrusion , chemical engineering , thermodynamics , physics , optics , engineering
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.