Abstract:
The average properties of carbon fiber reinforced plastics (CFRPs) depend on the extent of interaction between the fiber
and matrix. Any means, therefore, to modify either of the two constituents of CFRPs is the key to design the composite.
Carbon nanotubes (CNTs) are often used to tailor the interface/interphase in conventional CFRPs either by mixing the
nanotubes in matrix or by growing them on the surface of fiber. However, the incorporation of nanotubes, by either means,
may affect the mechanical performance of the matrix and that of the composite as a whole. Experiments are carried out to
assess the effect of CNT dispersion on the rate sensitivity of matrix, and the effect of CNT grafting on the average
mechanical properties of laminated composites. For better dispersion and interfacial interaction of nanotubes with matrix,
molecular level designing of nanotubes is carried out by way of functionalization. It is found that the ultimate strength of
epoxy composites increases with applied loading rate, and that neat epoxy is more rate sensitive than CNT based epoxy
nanocomposites. Significant enhancements are also observed in the interlaminar and fracture properties of CFRPs after the
incorporation of grafted nanotubes in the composite.
