MECHANICAL, SHAPE MEMORY AND ANTIBACTERIAL PROPERTIES OF GRAPHENE OXIDE/PLLA NANOCOMPOSITES

摘要

In this paper, poly-L-lactic acid (PLLA) was grafted onto the graphene oxide surface to improve its dispersity in the polymer matrix. The modified graphene oxide (g-GO) was dispersed in the PLLA matrix by solution blending to prepare g-GO/PLLA nanocomposites with different compositions. Their structure, mechanical properties, shape memory properties and antibacterial properties are investigated by FTIR, DSC, SEM, tensile test and antibacterial experiment. As the g-GO content increases, the crystallinity of the g-GO/PLLA composite slightly decreases. The elastic modulus and tensile strength of the nanocomposites increases with the increase of g-GO content and when the g-GO loading is 1.0 wt%, the maximun can be obtained. However, the elongation at break is weakened by the addition of g-GO. The g-GO/PLLA nanocomposites show good shape memory effect and antibacterial properties. The enhanced mechanical properties together with shape memory properties and antibacterial properties arising from the introduction of g-GO suggest that these nanocomposites may potentially be useful for a variety of biomedical applications.