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Poly(butyl terephthalate)/oxytetramethylene + oxidized carbon nanotubes hybrids: Mechanical and tribological behavior

Published online by Cambridge University Press:  03 July 2012

Witold Brostow ,
Georg Broza ,
Tea Datashvili ,
Haley E. Hagg Lobland  and
Agata Kopyniecka
Witold Brostow*
Affiliation:
Department of Materials Science and Engineering, Laboratory of Advanced Polymers and Optimized Materials; and Department of Physics, Center for Advanced Research and Technology, University of North Texas, Denton, Texas 76207
Georg Broza
Affiliation:
Institute of Polymers and Composites, Technical University of Hamburg, 21073 Hamburg, Germany
Tea Datashvili
Affiliation:
Department of Materials Science and Engineering, Laboratory of Advanced Polymers and Optimized Materials; and Department of Physics, Center for Advanced Research and Technology, University of North Texas, Denton, Texas 76207
Haley E. Hagg Lobland
Affiliation:
Department of Materials Science and Engineering, Laboratory of Advanced Polymers and Optimized Materials; and Department of Physics, Center for Advanced Research and Technology, University of North Texas, Denton, Texas 76207
Agata Kopyniecka
Affiliation:
Institute of Polymers and Composites, Technical University of Hamburg, 21073 Hamburg, Germany
*
a)Address all correspondence to this author. e-mail: wbrostow@yahoo.com
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Abstract

We have created hybrids of functionalized single wall carbon nanotubes (fSWCNTs) and also multiwall CNTs (fMWCNTs) with PBT/PTMO, a block copolymer of semicrystalline poly(butyl terephthalate) (PBT) with amorphous oxytetramethylene (PTMO). For both single wall (SW) and multiwall (MW) carbon nanotubes (CNTs) tensile modulus and strain at break as a function of CNTs’ concentration (cCNT) show maxima. Elongation at break is enhanced by the nanotubes, a plasticizing effect—much stronger for SWCNTs because they have less contact points per unit area with the matrix and also are more flexible. Repetitive tensile tests were also performed; each loading cycle resulted in lowering the tensile modulus. Brittleness B(cCNT) diagrams show minima. New results for CNT hybrids fit an earlier general diagram for determination of viscoelastic recovery in sliding wear (f) as a function of brittleness (B); the original equation with unchanged parameters covers also these results. Volumetric wear was determined after abrasion on a pin-on-disk tribometer. Minima are seen on the volumetric wear versus cCNT diagrams, similar to those on the B(cCNT) diagrams.

Keywords

nanohybridsscratch resistancesliding wearbrittlenessrepetitive tensile testingvolumetric wear
Type
Articles
Information
Journal of Materials Research , Volume 27 , Issue 14 , 28 July 2012 , pp. 1815 - 1823
Copyright
Copyright © Materials Research Society 2012

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