Electroplating of Polymers, Gas Permeability and Adhesion of the Composite Materials
Various homo- and copolymers have been investigated to understand the influences of the polymer morphology on gas permeability and on adhesion of the polymer to an electrolessly plated metal layer. Surface modifications developed to improve adhesion have influence on the wetting properties of the polymer. Wetting phenomena were utilized to characterize the surface and the interface. Among the possible bonding mechanisms (chemical, mechanical, wetting, diffusion and electrostatic forces), wetting plays a dominant role, and we found a good correlation between adhesion and interfacial free energy.
The homopolymers used in our study were semi-crystalline. Here the influence of the degree of crystallization, the molecular flexibility in the vicinity of the glass-transition temperature, and the orientation of the chain molecules on the permeability was investigated. The copolymers tested were multiphase systems, for example, acrylonitrile-butadiene-styrene (ABS) resin, or styrene-butadiene (SB) resin.
The gas permeability through a metal-polymer composite does not only depend on the thickness of the metal layer but also on its structure.
KeywordsMetal Layer Permeability Coefficient Chromic Acid Electroless Nickel Peel Strength
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