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Photothermal Characterization of Nanocomposites Based on High Density Polyethylene (HDPE) Filled with Expanded Graphite

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Abstract

The effective thermophysical and optical properties of high density polyethylene (HDPE) filled with 50 μm and 5 μm particle sizes of expanded graphite (EG50, EG5) are characterized. The methods used were front- and back-detection modulated photothermal radiometry (FD-, BD-PTR) and BD-flash IR thermography. Results were interpreted according to one-dimensional heat diffusion models. The absolute thermal diffusivity was determined at low frequency from FD- and BD-PTR spectra, while the volumetric heat capacity, the thermal effusivity, and the optical absorption coefficient were determined from broad-band FD-PTR spectra. The directly obtained diffusivity values compare well with those calculated from the heat capacity and thermal effusivity, and with BD-flash results. The errors caused by the finite absorption coefficient of diluted samples are also evaluated and corrected for. A particle-size effect with the opposite influence on thermal and optical properties has been observed. Heat transport parameters of HDPE/EG composites are significantly enhanced (factor of 3 to 4 in thermal diffusivity) at low particle charge before reaching saturation above a 0.10 particle volume fraction. These features are explained in the framework of effective medium models by strongly non-spherical EG particles.

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Authors and Affiliations

  1. Multiscale Thermophysics Lab. GRESPI-CATHERM, Université de Reims Champagne Ardenne URCA, Moulin de la Housse, BP 1039, 51687, Reims, France

    M. Chirtoc, N. Horny & J.-F. Henry

  2. Mechanical Engineering Department, Dokuz Eylul University, Bornova, Izmir, 35100, Turkey

    A. Turgut, I. Kökey & I. Tavman

  3. Polymer Institute, SAS, Dúbravská cesta 9, Bratislava, 845 41, Slovakia

    M. Omastová

Authors
  1. M. Chirtoc
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  2. N. Horny
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  3. J.-F. Henry
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  4. A. Turgut
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  5. I. Kökey
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  6. I. Tavman
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  7. M. Omastová
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Correspondence to M. Chirtoc.

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Chirtoc, M., Horny, N., Henry, JF. et al. Photothermal Characterization of Nanocomposites Based on High Density Polyethylene (HDPE) Filled with Expanded Graphite. Int J Thermophys 33, 2110–2117 (2012). https://doi.org/10.1007/s10765-012-1305-y

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  • DOI: https://doi.org/10.1007/s10765-012-1305-y

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