Title: Phase separation as a tool to control dispersion of multiwall carbon nanotubes in polymeric blends
Authors: Suryasarathi, Bose ×
Özdilek, Ceren
Leys, Jan
Seo, Jin Won
Wübbenhorst, Michael
Vermant, Jan
Moldenaers, Paula #
Issue Date: Mar-2010
Publisher: Amer chemical soc
Series Title: Acs applied materials & interfaces vol:2 issue:3 pages:800-807
Abstract: Conducting polymeric materials with stable phase microstructures have a range of potential applications. In this work, it is investigated whether phase separation in polymer blends can be used as a too] to create well dispersed conducting filler rich domains in 3D with controlled morphology, potentially resulting in more effective percolation. The effect of amine functionalized multiwall carbon nanotubes (NH2-MWCNTs) on the thermally induced phase separation processes in poly[(alpha-methyl styrene)-co-acrylonitrilel/poly(methyl methacrylate) (P alpha MSAN/PMMA) blends was monitored by melt rheology, conductivity spectroscopy, and microscopic techniques. Electron microscopic images revealed that the phase separation resulted in a heterogeneous distribution of NH2-MWCNTs in the blends. The migration of NH2-MWCNTs is controlled by the thermodynamic forces that drive phase separation and led to an increase in their local concentration in a specific phase resulting in percolative "network-like" structure. Conductivity spectroscopy measurements demonstrated that the blends with 2 wt% NH2-MWCNTs that showed insulating properties for a one phasic system revealed highly conducting material in the melt state (two phasic) as a result of phase separation. By quenching this morphology, a highly conducting material with controlled dispersion of MWCNTs can be achieved. Furthermore, the role of NH2-MWCNTs in stabilizing the PMMA droplets against flow induced coalescence in 85/15 P alpha MSAN/PMMA blends was also established for the first time. It was observed that at a typical loading of 1.25 wt. % NH2-MWCNTs the coalescence was completely suppressed on a practical time scale.
ISSN: 1944-8244
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Physical Metallurgy and Materials Engineering Section (-)
Soft Matter, Rheology and Technology Section
Soft Matter and Biophysics
× corresponding author
# (joint) last author

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