Page 41 - Handbook of Adhesion Promoters

34 Mechanisms of Adhesion

Figure 2.37. Schematic of the interface design (left) formation of hydrogen bond between the UHMWPE fiber/
polypyrrole coatings (right) providing mechanical force between polypyrrole coating layer and matrix. [Adapted,
by permission, from Jin, X; Wang, W; Xiao, C; Lin, T; Bian, L; Hauser, P, Compos. Sci. Technol., 128, 169-75,
2016.]

Figure 2.38. Schematic concept of noncovalent adhesion promotion in a self-healing system. The polymer
formed in the crack plane contains hydrogen-bond-donating groups that interact with hydrogen-bond-accepting
groups present in the epoxy matrix. [Adapted, by permission, from Wilson, GO; Caruso, MM; Schelkopf, SR;
Sottos, NR; White, SR; Moore, JS, Appl. Mater. Interfaces, 3, 3072-7, 2011.]
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ture. The shearing stress force of ice made from an additive-pure water mixtures to a
hard glass surface increased with the number of hydroxyl groups in the additive. 67
Increase in the shearing stress was caused by an increase in the surface energy of the ice
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relative to the number of hydroxyl groups. No influence of functional group type was
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observed − just the number of hydroxyl bonds per molecule.