| 摘要 |
FIELD: membrane- aided separation of gases, vapors, and liquids. SUBSTANCE: invention relates to preparing polymer membranes whose permeability is increased by stretching out membrane in a liquid medium resulting in growing microfissures through a part of membrane cross-section and corresponding decrease in the membrane effective thickness. In order to increase output of membrane by way of widening admissible deformation limits at membrane stretching and to raise stability of asymmetric membranes obtained, on one surface of polymer film or empty fiber, a thin layer of softened polymer is formed, which polymer has been preliminarily treated with a liquid plasticizer leading to strong swelling of polymer. Upon subsequent stretching out in a liquid medium, this plasticized layer is being thinned but remains unbroken and retains selective properties of membrane, while in non-plasticized part of film or empty fiber microfissures are developing reducing membrane effective thickness and increasing membrane permeability. To this, stability of membranes obtained proves to be high enough and, in some instances, allows the thermofixation to be excluded. EFFECT: increased membrane performance. |
