This work studied the effects of the addition of Multiwalled Carbon Nanotubes (MWCNT) to a PLLA matrix. Two distinct methods of preparation were employed: a combination of a solvent/ mechanical stirring and a combination of a solvent/high energy sonication. The mechanical properties of the nanocomposites were determined by nanoindentation and by the Vickers hardness test. Thermal properties of the nanocomposites (Tg, Tc, Tm and crystallinity degree) were determined by DSC. The tribological properties of the nanocomposites were determined by using a pin-on-disc apparatus. Mechanical and thermal properties did not present significant alterations, although tribological properties presented significant changes caused by the method of preparation and different loads. SEM images indicated that the wear mechanism was changed by the addition of MWCNT.
Multiwalled carbon nanotubes; PLLA; mechanical properties; tribological properties
