By R A Veselovskiĭ; V N Kestelʹman
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37 – G (mNÁm2 /kg) Adhesive Properties Control by Surface-Active Substances 29 ciations with the oligomer, although it includes both proton-donor and proton-acceptor groups. It can be assumed that L-19 molecules under close packing in the adsorption layers form hydrogen bonds with one another. Let us now consider the dependence of the surfactant surface activity on temperature. The DEG-1–L-19 system was studied only at 208C because at higher temperature the reaction between its components becomes noticeable.
The temperature change noticeably affects the character of the surface tension isotherms. The surface tension of systems polymerized at 208C changes gradually (see Fig. 13), while an increase in temperature results in the appearance of maxima on the isotherms (see Fig. 14). This difference in the path of the curves is explained by the fact that at low temperature, when the rate of polymerization is low, the state of aggregation of surfactant molecules falls into line with the state of the polymerizing solvent, which is demonstrated by the coincidence of the values of the surface tension determined under the equilibrium and dynamic conditions in the course of system polymerization.
Note that the oligomers investigated involve colored products that hinder the detection of the small-sized colloid particles. The light scattering was determined in the course of reaction at 208C. Since the system is in the liquid state and the polymerization rate is low, one can assume that the process of building up the micellar formations is close to the equilibrium. 10 shows the optical density of polymerizing systems containing various quantities of surfactant. There is a clear abrupt increase of the system optical density at certain degrees of conversion.