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

作者：Pedroni L G; Araujo J R; Feli**erti M I; Nogueira A F^*

来源：Composites Science and Technology, 2012, 72(13): 1487-1492.

DOI：10.1016/j.compscitech.2012.06.009

• Carbon nanotubes
• Electrical properties
• Mechanical properties
• Casting
• Extrusion

Composites of Kraton-D (R) 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 6 wt.% of MWCNT prepared by extrusion presented conductivity of the same order of magnitude as the composite with 1 wt.% of MWCNT prepared by casting - 10(-3) to 10(-4) S cm(-1). However, the extruded samples presented better mechanical properties than the casting ones.

• 出版日期2012-8-22