By R A Veselovskiĭ; V N Kestelʹman
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5 shows that increase of polymerization temperature at low surfactant concentrations results in the decrease of the optical density of the solid polymer and illustrates that temperature increase causes an abrupt decrease of concentration and size of the colloid particles in the polymer. Increase in the surfactant concentration results in the formation of colloid particles at conversion levels of the system for which its viscosity is still comparatively low. At the point of a sharp increase in the viscosity of the reactive system, enough colloid particles appear to be formed, which is why the rate of the viscosity increase practically does not influence the number and the size of the particles.
In this case L-19 can be considered indifferent in that at 208C its rate of interaction with DEG1 is very low. 1 shows that on all the curves at a certain concentration of surfactant there is a distinct kink after which the surface tension of the solution becomes independent of the surfactant concentration. This is likely related to the formation of micelles of the surfactant molecules that occurs at the surfactant concentration equal to CCMF (the critical concentration for micelle formation). Thus, the surfactant solutions in the oligomers are subject to the same regularities as those in other solvents.
The information presented was obtained under equilibrium conditions, whereas an adhesive-bonded joint is formed under nonequilibrium conditions. Taking account of the fact that in the course of adhesive polymerization there are a number of processes running at different rates, the kinetics of the cementing process must exert a fundamental effect on the properties of adhesive-bonded joints. 5 Effect of Surface-Active Substances on the Thermodynamic and PhysicalChemical Properties of Solid Polymers The surface tension of an oligomer depends on the lifetime of the surface relative to the fact that relaxation and diffusion processes in bulk and at the boundary run comparatively slowly.