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Nanocomposites based on MWCNT and styrene–butadiene–styrene block copolymers: Effect of the preparation method on dispersion and polymer–filler interactions

Authors
Journal
Composites Science and Technology
0266-3538
Publisher
Elsevier
Publication Date
Volume
72
Issue
13
Identifiers
DOI: 10.1016/j.compscitech.2012.06.009
Keywords
  • A. Carbon Nanotubes
  • B. Electrical Properties
  • B. Mechanical Properties
  • E. Casting
  • E. Extrusion
Disciplines
  • Earth Science

Abstract

Abstract Composites of Kraton-D® 1102 BT (a styrene–butadiene–styrene block copolymer) and multi-walled carbon nanotubes (MWCNTs) were prepared by melt mixing. The composites were characterized by electrical conductivity measurements (Coleman’s method), mechanical properties (DMA and stress–strain tests), thermal stability (thermogravimetry) and morphology of dispersion (SEM). Finally, the resulting composites were compared with those made by the solution casting method. The results showed a strong influence of the preparation methodology on the final properties of the composites due to changes in morphology. Composites prepared by casting showed a higher electrical conductivity than extruded ones; the composites with 6wt.% of MWCNT prepared by extrusion presented conductivity of the same order of magnitude as the composite with 1wt.% of MWCNT prepared by casting – 10−3 to 10−4Scm−1. However, the extruded samples presented better mechanical properties than the casting ones.

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