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Investigation of water sorption in multilayer boards, glued with different adhesives by means of neutron imaging, DVS and synchrotron microscopy

P. Niemz and S. J. Sanabria and W. Sonderegger and D. Mannes
Proc. 18th International Symposium on Non-destructive Testing and Evaluation of Wood
Madison, WI, USA 2013

Abstract

Diffusion processes into multilayered samples of Norway spruce have been measured and quantified by means of neutron imaging (NI). The influence of different adhesives on the diffusion process was investigated. For each sample configuration, neutron transmission images were used to measure time dependent water profiles in the diffusion direction. Using Fick's second law, diffusion coefficients in spruce wood and in the adhesive joints were calculated in function of the moisture content. The adhesives (1C PUR) show until three orders of magnitude lower values for the diffusion coefficient than spruce wood. UF leads to smaller barrier effects with respect to wood and 1C PUR. A correlation with the sorption properties of isolated adhesive films was detected. The diffusion through the adhesive films showed a clear dependendency on the moisture content. The results were compared with high resolution synchrotron light microscopy images from bond lines and sorption isotherms from adhesive films.


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@InProceedings{eth_biwi_01114,
  author = {P. Niemz and S. J. Sanabria and W. Sonderegger and D. Mannes},
  title = {Investigation of water sorption in multilayer boards, glued with different adhesives by means of neutron imaging, DVS and synchrotron microscopy},
  booktitle = {Proc. 18th International Symposium on Non-destructive Testing and Evaluation of Wood},
  year = {2013},
  pages = {294-300},
  publisher = {USDA Forest Products Laboratory},
  keywords = {}
}