Fig. 6 shows the dependence of the tensile fracture strength the GNPs weight fraction of the PP/GNPs composites. It can be seen
that the values of the tensile fracture strength of the PP/G1 and G3 composites increase slightly with increasing the GNPs weight
fraction. For the PP/G2 composite system, the values of the tensifracture strength also increase with increasing the GNPs weight
fraction when the GNPs weight fraction is lower than 0.3 wt.%, and
then decrease slightly with increasing the GNPs weight fraction
but the values of the tensile fracture strength are still higher than
that of the unfilled PP.
As stated above, the tensile strength of inorganic particle-filled
polymer composites is closely related to the interfacial adhesion
between the inclusions and resin matrix. For an inorganic thin
sheet shape particle, the interfacial adhesion effect of the composites
under tensile load mainly depends, to great extent, upon
the particle lateral area (i.e. length width) under the same
interface adhesion between the inclusions and resin matrix. The
sketch of a mechanical model of polymer composite filled with