By R A Veselovskiĭ; V N Kestelʹman
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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. The size of micelles is determined by energetic factors and concentration factors. The decrease of CCMF in a viscous system must result in decrease of the size of the micelles. For increase of the surfactant concentration, the micelle size increases, and spherical micelles transform into elliptic ones and then into plate-shaped ones as increase in the surfactant concentration in common solvents is accompanied by a free energy advantage.
Thus, there is opportunity for processes of completion of system polymerization and achieving the equilibrium surface tension to coincide. The change of the system surface tension when POPT reacts with TDI is characterized by a number of features. In the initial stages of the reaction the surface tension of the system increases (see Fig. 9), which is related to the formation of more polar urethane groups. The increase in the urethane content results in the increase of the surface tension up to a certain value, only after which does it fall.
For the OP-10 solutions in DEG-1 two kinks are observed on the isotherm; the kink at the lower surfactant concentration is usually related to preassociation. 2 presents CCMF ðCk Þ, areas occupied by the molecules in the extremely saturated adsorption layer ðSmax Þ, and surface activity ðGÞ for OP-10 and L-19 in epoxy resins. CCMF was determined by the kink in the curves (Fig. 1). 1 Isotherms of surface tension of DDM (1) and L-19 (2) solutions in DEG-1 at 208C. Surface activities were determined by G¼ À k ck ð2:7Þ where is the surface tension of the oligomer, and k is the same but at surfactant concentration equal to CCMF.