Abstract
The sorption behaviour of water molecules in epoxy-based thermosetting networks is discussed and related to the modifications of the polymer properties. The hypothesized sorption modes and the corresponding mechanisms of plasticization are discussed on the basis of experimental liquid-sorption tests, differential scanning calorimetry (DSC), and electrical analyses. Two modes of moisture sorption are assumed: a sorption leading to an increase in the free volume of the system, and adsorption of the water molecules due to hydrogen bonding to hydrophilic groups present in the network and to the surfaces of “holes” which make up the excess free volume of the glassy polymer. Electrical investigation improved the understanding of the hygrothermal ageing phenomena. Water conditioning of the composites modified the surface and bulk resistivities as a consequence of microstructural damage and plasticization.
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Apicella, A., Egiziano, L., Nicolais, L. et al. Environmental degradation of the electrical and thermal properties of organic insulating materials. J Mater Sci 23, 729–735 (1988). https://doi.org/10.1007/BF01174713
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DOI: https://doi.org/10.1007/BF01174713