Adjusting the Charge-Density Parameter in Waterborne Adhesives
The polymer structural changes detected by infrared analysis have also been correlated with the overall adhesion and cohesion strength in the system. These results could have a significant bearing on the mechanism of the pigment-polymer association in waterborne coatings and adhesives. The results are discussed in light of the polymer charge density and two-phase condensation model for polyelectrolytes.
In the early development years of waterborne coatings, the products found application in very specific areas and were not able to replace solventborne coatings and adhesives since they all had serious performance problems. This was in part due to the lack of understanding of the chemical and behavioral characteristics of polymeric systems in aqueous solutions, which are far different from solvent systems.