3.3. Dependence of tensile strength on GNPs content
Fig. 5 presents the dependence of the tensile yield strength on
the GNPs weight fraction of the PP/GNPs composites. It is shown
that the values of the tensile yield strength of the PP/G1 and the PP/
G3 composite systems increase slightly with an addition of the
GNPs weight fraction, and the relationship between them is almost
linear. For the PP/G2 composite system, the values of the tensile
yield strength also increase with increasing the GNPs weight fraction,
and the value of the tensile yield strength is up to the
maximum at the GNPs weight fraction of 0.1 wt.%. It is generally
believed that the tensile strength including tensile yield strength
and tensile fracture of polymer composites depends, to great
extent, on the interfacial adhesion between the inorganic particles
and resin matrix [29]. Consequently, it can be concluded from the
results shown in Fig. 5 that the interfacial adhesion between the
GNPs and the PP matrix is strong in this case.