Abstract
The oscillatory mode of permeability and selectivity of an asymmetric poly (vinyltrimethylsilane) (PVTMS) membrane during the pervaporation of binary solutions containing a surface-active component is revealed. A mechanism for the process, including the periodic appearance and collapse of micropores in the membrane skin, is suggested. The appearance of pores is determined by the existence of internal tensile stresses in the membrane skin and the adsorption-induced decrease of the polymer strength. The collapse of pores is caused by desorption of the surfactant taking place due to predominant transport of the surface-inactive component. The experimental confirmation of the suggested mechanism is presented. It is shown that the critical value of polymer-solution surface tension at which auto-oscillations start is 9 mN/m. The value of internal stresses in the membrane skin is estimated as 100 kg/cm 2.
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