|MadSci Network: Chemistry|
The types of hot melt adhesive that you are using are generally comprised of three major components; Polypropylene, acrylic acid (propenoic acid), and an organic peroxide. The particular organic peroxide used is variable and is highly dependant upon the application that the adhesive will be used. Although I cannot be certain due to the unknown nature of the organic peroxide, What I think may be happening is that the nickel to which you are applying your hot melt adhesive may be acting as a hydrogenation catalyst. In essence, one of the components of the adhesive is being converted by catalytic hydrogenation to a more volatile substance. Since the properties of the component have now changed from what it was in the original adhesive and it can sublime out at room temperature. This explanation, however is only speculation since I don't know the exact composition of the adhesive.
Try the links in the MadSci Library for more information on Chemistry.
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