Page 40 - Handbook of Adhesion Promoters

2.10 Hydrogen bonding 33

Figure 2.36. Schematic illustration of the preparation process of polydopamine-functionalized graphene oxide-
silver nanowire hybrid transparent conductive films. [Adapted, by permission, from Miao, J; Liu, H; Li, W;
Zhang, X, Langmuir, 32, 5365-72, 2016.]

whereas preferable adsorption on copper sulfides takes place via unsaturated functional
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groups.
The adhesion strength of samples prepared by poly(phenylene sulfide) thin film coat-
ing (~26 MPa) was largely enhanced when compared to that of samples obtained by etch-
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ing (~15 MPa).
The rare earth treatment led to an increase in the fiber surface roughness, formation
of oxygen-containing groups, and introduction of rare earth element on the carbon fiber
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surface. Coordination linkages between fibers and rare earth and between rare earth and
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resin matrix were formed (Figure 2.35). The interlaminar shear strength of epoxy com-
posites increased, which indicated the improvement of the interfacial adhesion between
fibers and matrix resin resulting from the increase in concentration of carboxyl and carbo-
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nyl groups.
Mussel-inspired polydopamine-functionalized graphene was used as a conductive
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adhesion promoter and protective layer for silver nanowire transparent electrodes. Gra-
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phene oxide (GO) was functionalized and reduced by polydopamine. It was used as a
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conductive adhesion promoter and protective layer for the silver nanowire. This trans-
parent conductive film can be used in various optoelectronic devices, such as solar cells,
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electrochromic devices, OLED, and touch panels.
2.10 HYDROGEN BONDING
The ice adhesion force to a cooling surface of a solid (metal excepted) is governed by
hydrogen bonding and van der Waals forces (the van der Waals forces are much smaller
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than the hydrogen bonding forces). Additives with different number of hydroxyl groups
(e.g, α-glucosylrutin − 10, epigallocatechin gallate − 8, chlorogenic acid − 6, ascorbic acid
− 4 of −OH groups per mole, respectively) were mixed with water and the ice adhesion
force of mixture to a cooled hard glass surface was measured at a fixed surface tempera-