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  • 1 University of Exeter School of Engineering and Computer Science Exeter EX4 4QF UK Exeter EX4 4QF UK
  • | 2 Becker Industrial Coatings Goodlass Road Speke Liverpool L24 9HJ UK Goodlass Road Speke Liverpool L24 9HJ UK
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Abstract  

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 (Tg) of up to 10C was found as the controlled RH was increased.