The influence of plasma treatment on the surface properties of high-performance thermoplastic

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Abstract

The plasma treatments, corona and low-pressure plasma, were applied to two so-called high-performance thermoplastics, polyetherimide (pei), a liquid crystalline polymer (lcp) and, for comparison, to polypropylene (pp). The treated surfaces were characterized by surface energy studies. In addition, the shear strengths of aluminium-polymer joints using a range of different adhesives were measured. While for pp the changes in surface energy corresponded to the changes in shear strength, for pei aand lcp a clear correlation between pretreatment and adhesive strength could not be found. Different failure mechanisms occured due to interaction of the plasma treatment with the morphological structure of both polymers, adhesive and plastic substrate.

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    Indeed, even when using an adhesive (e.g. epoxy) to join a metal and thermoplastic polymer, the critical interface is still metal-polymer, though it has just been exchanged to metal-epoxy, rather than metal-thermoplastic (Fig. 1). As such, numerous methods of chemical surface modification exist to further assist bonding such as includes plasma treatments [12,13] and dip-coating [14,15] of metals. The application of an adhesive between the polymer and metal surfaces is commonly used, though, again finding an adhesive which complementarily adheres to each material equally is challenging.

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