Page 175 - Handbook of Adhesion Promoters

168 Selection of Adhesion Promoters for Different

Figure 8.9. (a) Effect of surface modification on the bond strength of PVAl modified Portland cement mortars in
its adhesion to glass tiles, and the variation of bond strength due to surface modification (indicated by the
arrows). (b) Schematic representation of active groups on the ceramic glass tile surface. [Adapted, by permission,
from Mansur, AAP; Mansur, HS, Cement Concrete Compos., 33, 742-8, 2011.]
8.23 POLYVINYLALCOHOL

Hydrophilic silane functionalities and isocyanate groups improved interfacial strength
between tiles and polyvinylalcohol-modified mortar while the silane bearing hydrophobic
1
functional group decreased adhesion resistance. The adhesion mechanism performed by
hydrophilic silanes suggested the contribution of covalent chemical bonds between PVAl
1
cement modifier and coupling agents at the interface. Figure 8.9 shows the effect of dif-
ferent silanes on adhesion improvement of polyvinylalcohol-modified mortar.
REFERENCES
1 Mansur, AAP; Mansur, HS, Cement Concrete Compos., 33, 742-8, 2011.