X-Ray Studies of Conformational Transformations in the Composition of Nanofiltration Films
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Conformational transformations in the structure of the surface layer and the substrate of initial and working nanofiltration films have been investigated in this work using large-angle X-ray scattering. It has been determined that the mechanical load caused by excess pressure corresponding to 1.5 MPa in the case of OFAM-K porous-composition film has resulted in conformational changes of Phenylon C-4 macromolecules in crystal and amorphous intercrystallite phases; in this case, the calculated degrees of crystallinity have decreased from 49 to 36%. It has been noted that there is the polymorphous rearrangement of the crystal phase with the change of the sizes of crystal cell toward the crystal axis (c) and an increase in the crystallinity from 44 to 55% in the working specimen of the OPMN-P-composition nanofiltration film; in this case, the amorphous phase opens. A full calculation of the radial-distribution function of the atoms of initial and working films has been carried out, which confirms that there is rearrangement of lattice cells due to the increase in atomic distance.
Keywordsconformational transformations composition nanofiltration film surface crystallinity amorphism radial-distribution function hydrodynamic permeability
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