Compressive stresses in stiff polymer coatings can give rise to surface instabilities in which the coating adopts a sinusoidally wrinkled morphology with a dominant wavelength, d, as displayed in Figure 1a. Such instabilities are generally observed for polymer coatings that are well-adhered to compliant substrates. Compressively stressed coatings may also simply delaminate over a localized area these features, commonly called blisters, are formed in systems where the compliance of the substrate is high and/or coating-substrate adhesion is poor. Between these two extremes of behavior, one can observe wrinkling delamination , where a coating initially wrinkles but then forms blisters of width L that relax the wrinkling stability within an approximate width R. While both wrinkling instabilities and buckle delamination have been well-studied in the literature, wrinkling delamination has received very little attention. This talk will lay a theoretical foundation for wrinkling delamination and demonstrate how studying this phenomenon can lead to new approaches for measuring the adhesion strength of polymer coatings and patterning microscale features.
Conference Dates: March 21-25, 2010
Conference Location: San Francisco, CA
Conference Title: American Chemical Society, Spring 2010 National Meeting & Exposition
Pub Type: Conferences
adhesion, polymer, coatings, wrinkling, delamination, mechanics, patterning