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Journal of Thermal Analysis and Calorimetry

, Volume 109, Issue 3, pp 1277–1284 | Cite as

TMDSC phase angle for a better nanocomposite interphase identification

  • Javier Tarrío-SaavedraEmail author
  • Carlos Gracia-Fernández
  • Jorge López-Beceiro
  • Salvador Naya
  • Ramón Artiaga
Article

Abstract

The present study suggests a new approach, based on the utilization of temperature modulated differential scanning calorimetry (TMDSC) technique, for identifying and characterizing the organic–inorganic interphase of two materials: an epoxy–fumed silica nanocomposite and a thermoplastic polyurethane (TPU)–multiwalled nanotube (MWNT) composite. The approach used here makes use of TMDSC data and basically consists of using the phase angle or the derivative of the reversing heat flow instead of the reversing heat flow curve itself. In the case of epoxy–fumed silica composites, two glass transition regions were identified. The glass transition temperature (T g) of the composite was observed to vary as a consequence of the filler content. This study shows that the T g variation is due to the formation of an organic–inorganic interphase, with its own glass transition temperature, which is different from the epoxy matrix T g. In the case of TPU–MWNT composites, two relaxations and an additional first order transition were observed: the first relaxation corresponds to the hard segment, the second is related to an interaction between filler and matrix and the third process may be connected to the partial melting of the hard segment. The addition of 0.5 wt% MWNT causes a small reduction in T g of the TPU. A major nanotube addition, 10 wt%, induces the appearance of a new relaxation that may be associated with the existence of an interface. In general, a better separation between the matrix and interphase glass transitions was obtained by the TMDSC phase angle signal.

Keywords

Nanocomposites interphase TMDSC Phase angle Nanotubes Fumed silica 

Notes

Acknowledgements

This research has been partially supported by the Spanish Ministry of Science and Innovation, Grant MTM2008-00166 (ERDF included) and Grant MTM2011-22393. The authors thank Senén Paz for constructive comments and the referees for their valuable suggestions.

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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2012

Authors and Affiliations

  • Javier Tarrío-Saavedra
    • 1
    Email author
  • Carlos Gracia-Fernández
    • 2
  • Jorge López-Beceiro
    • 1
  • Salvador Naya
    • 1
  • Ramón Artiaga
    • 1
  1. 1.Higher Polytechnic SchoolUniversity of A CoruñaFerrolSpain
  2. 2.Thermal Analysis, Rheology and Microcalorimetry Applications, TA Instruments-Waters CromatografíaAlcobendasSpain

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