Diffusion of adhesion promoter (CPO) into polypropylene/ethylene-propylene (PP/EP) copolymer blends: mechanism

Tomasetti, E;Legras, Roger;Daoust, Daniel;Bertrand, Patrick;Rouxhet, Paul
(2001) Journal of Adhesion Science and Technology : the international journal of theoretical and basic aspects of adhesion science and its applications in all areas of technology — Vol. 15, n° 13, p. 1589-1600 (2001)

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  • Tomasetti, E
    Author
  • Legras, RogerUCLouvain
    Author
  • Daoust, DanielUCLouvain
    Author
  • Bertrand, PatrickUCLouvain
    Author
  • Rouxhet, PaulUCLouvain
    Author
Abstract
Chlorinated polypropylene (CPO) is commonly used as an adhesion promoter for paint on polypropylene/ ethylene - propylene copolymer blends (PP/EP). An adhesion mechanism frequently proposed in the literature is the CPO diffusion into the substrate, leading to molecular entanglement. It is shown here that CPO and PP/EP are immiscible. On the other hand, the use of radiolabelled CPO allowed quantification of CPO diffusion into PP/EP substrates as a function of several parameters and under conditions which simulate industrial practice. Diffusion requires substrate swelling by the solvent. This explains that it increases with the EP content of the material, with the solvent ability to swell the substrate, and with the thickness of the paint. For baked samples, diffusion passes through a maximum when the delay between CPO application and baking is varied. This is due to a balance between two processes working in opposite directions, i.e. substrate swelling and solvent evaporation.
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Tomasetti, E., Legras, R., Daoust, D., Bertrand, P., & Rouxhet, P. (2001). Diffusion of adhesion promoter (CPO) into polypropylene/ethylene-propylene (PP/EP) copolymer blends: mechanism. Journal of Adhesion Science and Technology : the international journal of theoretical and basic aspects of adhesion science and its applications in all areas of technology, 15(13), 1589-1600. https://doi.org/10.1163/156856101753207698 (Original work published 2001)