Journal
THERMOCHIMICA ACTA
Volume 672, Issue -, Pages 150-156Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.tca.2018.12.011
Keywords
Polyamide; Water-induced plasticizing effect; StepScan DSC
Funding
- German National Science Foundation (DFG)
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Polyamides are known to absorb and desorb water to establish an equilibrium with their environment. Water uptake by diffusion leads to a drastic reduction in the strength and stiffness of the material, which is referred as the water-induced plasticizing effect. This effect leads to a shift of the glass transition region towards lower temperatures what can be determined by differential scanning calorimetry (DSC). However, a determination of the glass transition temperature T-g is not accurate in samples with inhomogeneous moisture distribution before an equilibrium is reached by diffusion and T-g is superimposed by water-specific effects. It is shown that the glass transition can be measured by StepScan DSC even with inhomogeneous moisture distribution within the sample. In addition, a method is developed and validated which uses the low thermal conductivity and the shift of T-g to detect a water-saturated sample boundary layer in inhomogeneously conditioned PA 6 samples.
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