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The present study investigated the effect of TiO 2 fillers on the mechanical properties of CNT/PMMA composites. TiO 2 /PMMA/CNT composites were prepared by using twin screw extruder and test samples by injection moulding. Results indicated that incorporation of CNT in PMMA causes decreases in tensile stress, elongation at break, and on impact properties. It is observed that addition of CNT and TiO 2 seems to be beneficial in increasing mechanical strength via increasing the interface dispersed phase.

Ultra-high-molecular-weight polyethylene (UHMWPE) fibers have been modified by plasma treatment to increase adhesion in high-density polyethylene (HDPE) matrices. Results showed that surface roughness predominates for modified UHMWPE fibers, indicating that the plasma treatment favors the interaction with HDPE. Unmodified HDPE composite samples gave a lower interlaminar shear strength than did the samples that were incorporated with UHMWPE. The addition of unmodified UHMWPE fibers to the neat HDPE significantly increases interlaminar shear strengths of composites, up to 20 vol%. The oxygen concentration increased from 16.16 %to 21.99%, and the ratio of oxygen to carbon atoms increased significantly from 0.194 to 0.284 after oxygen plasma treatment for 5 minutes with a power of 300 W.

The authors present a study of the tribological properties of short carbon=carbon nanotube (CNT)=PA6 hybrid composites. Their specific wear rate and the coefficient of friction were examined as a function of sliding time and distance. In addition, the hybrid composites with varying CNT volume ratio were tested to assess hybrid effects. It was found that the friction and wear rate decreased with sliding distance and then leveled off under dry sliding conditions, showing the effective reinforcing effect of CNT. Worn surfaces were observed by scanning electron microscope and the wear process was governed by the plastic deformation and mechanical microploughing.

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