By Vladimir Kestelman, Roman Veslovsky
If you'd like a common knowing of polymer adhesion, this publication isn't really for you. it really is for the complex reader and is overestimated!
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The kink on the surface tension isotherm at low surfactant concentrations can be related to the formation of the surfactant ‘‘pre-associations’’ in the system. 7 Isotherms of the surface tension of OP-10 solutions in DEG-1 at various conversion levels of the epoxy groups: (1) 5%, (2) 10%, (3) 20%, and (4) 30%. 7 shows that with increase in the degree of epoxy conversion, ‘‘pre-associations’’ occur at lower surfactant concentrations. The surfactant concentration at which ‘‘pre-micelles’’ and micelles are formed is related to the decline of surfactant solubility in the oligomer during its polymerization.
As Fig. 5 shows, in the early stages of the reaction there is an abrupt decrease of the particle concentration while their size does not change significantly. Once the concentration of the PR molecules formed exceeds CCMF, a decrease of the particle size is observed such that the size of the PR aggregates is smaller than that of OAA. The data permit an easy explanation of the regularities of the change in surface tension during the course of DEC-1 reaction with various quantities of OAA (Fig. 6).
The use of curing agents for polymeric adhesives and coatings with surface-active properties is of considerable interest. These include curing agents for epoxy resins like oligoamineamides (OAA) or versamides. Such substances change the surface tension of the epoxy resins and their wetting capacity is enhanced by the fatty alkyl chain and by the polar amine groups; in structure they are similar to detergents. The curing of epoxy resins by liquid polyamide resins gives products that have good wetting properties and better adhesion and elasticity compared with epoxy resins cured by polyamines.