Adhesives for Dissimilar Materials

This is a discussion of points to be considered when using adhesives to bond dissimilar materials. There is no separate and distinct class of adhesives used solely for this purpose. However, thermoplastic synthetic polymers are probably better for the job than either the naturally occurring or the thermosetting synthetic materials. Each combination of materials must be considered as an individual case with individual problems. The more frequently encountered dissimilarities may be classified roughly as chemical and physical. Chemical dissimilarities are those that have to do with adhesion to the surfaces to be bonded, with the effect of the adhesive composition on the bonded materials, and with the possibility of galvanic action in metal-to-metal bonds. Important physical dissimilarities are those controlling relative dimension changes of the bonded materials in response to temperature and moisture variations and the modulus of elasticity of the adhesive and of each bonded member. The latter properties are important when there may be stresses on the bond other than those that are inherent from the nature of the bonded materials. In such cases the modulus of the adhesive should be the same as or slightly less than that of the bonded materials.

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