Multiwalled carbon nanotube/clay-incorporated polymeric nanocomposites.

초록

The interfacial adhesion between poly(L-lactide) (PLLA) and nano-sized fillers were improved after meltcompounding by introducing epoxy groups to the clay surface and carboxylic group-functionalized multiwalled carbon nanotubes (MWCNTs). The dispersion of MWCNTs in the PLLA matrix decreased the electrical resistivity of the composite substantially due to the increased MWCNT load. The electrical resistivity of the composites decreased from 10^15 to 10^3 Q·cm with increasing MWCNT content from 0 to 2.0 wt%. However, there was a significant increase in volume resistivity when TFC was introduced to the PLLA/MWCNTs nanocomposites. The electrical resistivity of the PLLA/MWCNTs/TFC composites at a fixed MWCNT content of 1.0 wt% increased from 10^7 to 10^13 Q·cm with increasing TFC content from 0 to 2.0 wt%. 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 decreased the electrical conductivity of the nanocomposites.