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Effect of Matrix Morphology on the Wear and Friction Behavior of Alumina Nanoparticles/ Poly(ethylene) Terephthalate Composites
Praveen Bhimaraj, David Burris, Jason Action, W. Gregory Sawyer, C. Gregory Toney, Richard W. Siegel1, Linda S. Schadler
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The friction and wear properties of poly(ethylene) terephthalate (PET) filled
with alumina nanoparticles were studied. The nanoparticle loading was varied from
1 wt% to 10 wt%. The nanocomposite samples were tested in dry sliding against a steel
counterface. The results show that the addition of nanoparticles can result
increase the wear resistance by almost 2x over the unfilled polymer. The friction
coefficient also decreased in many cases. The nanocomposites form a more adherent
transfer film that protects the sample from the steel counterface, although the
presence of an optimum filler content may be due to the development of abrasive
agglomerates within the transfer films in the higher wt% samples. This study varied
both crystallinity and weight percent of filler in a PET matrix in an attempt to
separate the effects of nanofillers and crystallinity on the tribology.
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