By Rose A. Ryntz, Philip V. Yaneff
Surveys fresh advancements in coating polymers and plastics. Evaluates the coatings functionality compromise in coating choice for polymers and plastics.
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Additional resources for Coatings of Polymers and Plastics
An excellent figure of merit for wetting is the contact angle, which is the angle between the substrate and a tangent drawn to the liquid drop, as shown in Figure 24. The contact angle, θ, is indicative of the strength of the substrate/liquid interaction—the higher the interaction, the smaller the contact angle. Young’s equation, Eq. (1), predicts the interfacial tension between two materials, γsc, from experimental contact angle measurements, where γs is the surface energy of the substrate and γc is the surface energy of the coating, both in air.
The level of chlorination and molecular weight are the critical CPO parameters, with typical commercial values of about 20% chlorine content and a molecular weight of about 15,000. The mechanism for enhanced adhesion appears to be only the improved wetting of the polyolefin surface— without the CPO penetrating into the coating, because spectroscopic analysis has shown that adhesive failure occurs at a sharp substrate/CPO interface (11). The superior mechanical properties of the CPO primed system, in comparison to that of only the olefinic substrate, are believed to improve adhesion through improved stress transfer across two new interfaces (12).
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