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27. Influence of the Structure of the Surface Cellulose Acetate Layer on the Transport Characteristics of Ultrafiltration Composite Membranes.

Author

Lazarev, S. I., Golovin, Yu. M., Khorokhorina, I. V., Lazarev, D. S., and Rodionov, D. A.

Subjects
CELLULOSE acetate, COMPOSITE membranes (Chemistry), SURFACE structure, ULTRAFILTRATION, HYDROGEN bonding interactions, SCANNING electron microscopy, INTRAMOLECULAR proton transfer reactions
Abstract

The influence of the structure of the surface cellulose acetate layer on the transport characteristics of ultrafiltration composite membranes is considered using the methods of IR spectroscopy and of scanning electron microscopy. The amorphous phase of ultrafiltration cellulose acetate composite membranes is formed at a certain stage of the technological cycle of obtaining a composite membrane. IR spectra are presented where the forms of the absorption bands of valence vibrations of hydroxylic groups at ν = 3339.14–3366.2 cm–1 alter the asymmetry parameter from ~1 for an air-dry sample and to 0.79 for a water-saturated one, which allows the assertion of formation of volumetric supermolecular structure of a cellulose acetate layer of an air-dry sample by two types of hydrogen bonds and dipole–dipole interactions of carbonyl groups. The decrease of the asymmetry parameter to 0.79 of the absorption bands of hydroxylic groups and of the intensity of absorption bands of methyl groups by 2.56, 3.3, and 3.8 times in water saturated samples of membranes occurs because of the destruction of supermolecular structure and reorganization of hydrogen bonds between the active groups of cellulose acetate and molecules of water. The data obtained by the method of scanning electron microscopy allow one to note that the surface layer of ultrafiltration membranes has an asymmetric pore structure. The surface layer of a membrane can be divided into two components: a selectively permeable layer with pores of small size and a pore substrate, in which the pores increase in their diameter as they approach the substrate. [ABSTRACT FROM AUTHOR]

Published
2019
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28. Структурные исследования порового пространства полупроницаемых мембран МГА-95 и ESPA методом малоуглового рентгеновского рассеивания

Author

Лазарев, С. И., primary, Головин, Ю. М., additional, Лазарев, Д. С., additional, Хорохорина, И. В., additional, Lazarev, S. I., additional, Golovin, Y. M., additional, Lazarev, D. S., additional, and Khorokhorina, I. V., additional

Published
2016
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