Abstract
The diffusion of water into adhesives and adhesive joints is controlled by Fick’s laws, and it is solutions to Fick’s second law in Cartesian coordinates, which are most used in this context. Such solutions can describe diffusion in both 1 and 2 dimensions. Humidites in air are conveniently controlled using saturated solutions of salts. It is the interactions of water with epoxide adhesives which have been studied most, and diffusion is often fickian, but non-fickian diffusion is not uncommon. When salt is dissolved in water, in effect it dilutes the water, and the amount of water which is absorbed is reduced. Absorption isotherms for water in epoxides are non-linear. Water can change the properties of epoxides by lowering the glass-transition temperature, forming cracks, crazes and voids. Mechanical properties are also affected. Amongst non-structural adhesives, water diffusion has been reported for some silicones and isocyanates.
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Abbreviations
- :
-
The following abbreviations are used to indicate the components of epoxide adhesives.
- BF3MEA:
-
Borontrifluoride monoethylamine
- CTBN:
-
Carboxy-terminated butadiene-nitrile polymer
- DAB:
-
1,3-diaminobenzene
- DAPEE:
-
Di(1-aminopropyl-3-ethoxy)ether
- DGEBA:
-
Diglycidyl ether of bisphenol-A
- DDM:
-
4,4′-diaminodiphenylmethane
- DICY:
-
Dicyandiamide
- DMP:
-
Tris(dimethylaminomethyl)phenol
- TETA:
-
Triethylenetetramine
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Comyn, J. (2013). Diffusion of Water in Adhesives. In: da Silva, L., Sato, C. (eds) Design of Adhesive Joints Under Humid Conditions. Advanced Structured Materials, vol 25. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-37614-6_1
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