By R A Veselovskiĭ; V N Kestelʹman
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Additional resources for Adhesion of polymers
The separation of surfactant Adhesive Properties Control by Surface-Active Substances 45 from the polymerizing adhesive with added surfactant can cause abrupt decreases of the adhesion strength because the reaction between the adhesive and the substrate in this case will be carried out via a layer of low-molecular weight substances that has low cohesion strength. For RS substances there is no threat of formation of the weak boundary layers because the polymerization of systems with RS substances does not result in separation into macrophases.
Adhesive Properties Control by Surface-Active Substances 39 [70, 97, 98]. Consequently, the surface tension of the polymerizing system with added surfactant is affected both by changes of the structure and the chemical composition of the polymerizing oligomer and by the change of surfactant colloid-chemical properties. To obviate difficulties in separation of these two factors, DEG-1 epoxy resin was selected as an oligomeric solvent. The surface tension of DEG-1 when reacting with PEPA does not change up to a considerable degree of conversion.
3 suggest that the primary contribution to increase of the system CCMF is made by the increase of the surfactant solubility. In fact, CCMFPR estimated by the micellar mass for conditions where surfactant molecule branching is more extensive than that of OAA, is 3-fold lower than CCMF determined experimentally. Thus, at least 2/3 of the CCMF growth is caused by increase of the surfactant affinity for the solvent. The decrease of the aggregation of surfactant particles in the course of reaction is confirmed by light scattering studies.