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Electrical and Mechanical Properties of Poly(L-lactide)/Carbon Nanotubes/Clay Nanocomposites

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Abstract:

An organoclay containing epoxy groups, twice-functionalized organoclay (TFC), was synthesized by reacting (glycidoxypropyl)trimethoxy silane with Cloisite25A® (C25A), which had already been modified with an amine compound. The introduction of epoxy groups to the clay surface and carboxylic group-functionalized multiwalled carbon nanotubes (MWCNTs) improved the interfacial adhesion between the poly(L-lactide) (PLLA) and nano-sized fillers when melt-compounded. The PLLA/MWCNTs/TFC nanocomposites showed superior tensile properties to those of PLLA and PLLA/CNTs. The dispersion of MWCNTs in the PLLA matrix decreased the electrical resistivity of the composite substantially due to the higher MWCNT loading. However, the introduction of TFC to the PLLA/MWCNTs nanocomposites resulted in a slight increase in volume resistivity. This increase was attributed to the individual MWCNTs being blocked by the TFC. The clays in the PLLA/MWCNTs/TFC nanocomposites prevented direct contact between the neighboring MWCNTs, which increased the electrical resistivity of the nanocomposites.

Keywords: CARBON NANOTUBE; CLAY; ELECTRICAL CONDUCTIVITY; MECHANICAL PROPERTIES; NANOCOMPOSITE; POLY(L-LACTIDE)

Document Type: Research Article

DOI: https://doi.org/10.1166/jnn.2010.2233

Publication date: 2010-05-01

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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