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Nanomechanical Properties of UV Degraded TiO2/Epoxy Nanocomposites

Published online by Cambridge University Press:  01 February 2011

Stephanie Scierka ,
Peter L. Drzal ,
Amanda L. Forster  and
Stephanie Svetlik
Stephanie Scierka*
Affiliation:
National Institute of Standards and Technology, Building and Fire Research Laboratory 100 Bureau Drive, Stop 8615, Gaithersburg, MD 20899–8615, U.S.A.
Peter L. Drzal
Affiliation:
National Institute of Standards and Technology, Building and Fire Research Laboratory 100 Bureau Drive, Stop 8615, Gaithersburg, MD 20899–8615, U.S.A.
Amanda L. Forster
Affiliation:
National Institute of Standards and Technology, Building and Fire Research Laboratory 100 Bureau Drive, Stop 8615, Gaithersburg, MD 20899–8615, U.S.A.
Stephanie Svetlik
Affiliation:
National Institute of Standards and Technology, Building and Fire Research Laboratory 100 Bureau Drive, Stop 8615, Gaithersburg, MD 20899–8615, U.S.A.
*
* Please address all correspondence to either Stephanie.Scierka@nist.gov or Peter.Votruba-Drzal@nist.gov
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Abstract

Model epoxy nanocomposite thin films containing one of three types of titanium dioxide (TiO2) particles were degraded using an integrating sphere-based ultraviolet weathering chamber. Instrumental Indentation Testing (IIT) was used to measure nanomechanical changes in the surface region of thin films resulting from UV exposure. Attenuated Total Reflectance-Fourier Transform Infrared Spectroscopy (ATR-FTIR) and Differential Scanning Calorimetry (DSC) were used to support the mechanical results with chemical and thermal data. The unfilled epoxy was the most photosensitive sample tested, exhibiting the highest rates of chemical oxidation, the largest decrease in the glass transition (Tg), and the greatest increase in elastic modulus with increased exposure. Similar trends were observed in the nanocomposite films, but the rates of change were much lower than the unfilled epoxy and decreased with increasing volume fraction of nanoparticles.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 841: Symposium R – Fundamentals of Nanoindentation and Nanotribology III , 2004 , R5.10
Copyright
Copyright © Materials Research Society 2005

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