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Controlled temperature and relative humidity dynamic mechanical analysis of paint films


A description is given of modifications to a dynamic mechanical analyser (DMA) to allow controlled relative humidity (RH) experiments to be performed under isothermal or thermal scanning conditions. Free film samples of polyester melamine paints (under-cured, normal-cured and over-cured) were supplied and the viscoelastic properties measured in the tensile mode of the DMA. A reduction in the glass transition temperature (T g) of up to 10°C was found as the controlled RH was increased.

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Foster, G.M., Ritchie, S. & Lowe, C. Controlled temperature and relative humidity dynamic mechanical analysis of paint films. Journal of Thermal Analysis and Calorimetry 73, 119–126 (2003).

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  • dynamic mechanical analyser
  • relative humidity
  • films
  • paint