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Article

Thermophysical Properties of Materials
2020. V. 58. № 6. P. 812–817
Lazarev S.I., Golovin Yu.M., Kovalev S.V., Lazarev D.S., Levin A.A.
Influence of thermal effects on the transport characteristics of cellulose acetate porous films
Annotation
Experimental data have been obtained, and the characteristics of the moisture content and permeability of cellulose acetate porous materials were analyzed via thermal action. Dynamic thermogravimetric analysis found that the destruction process in an air-dry sample of the membrane begins at 21C. It is accompanied by a 2% weight loss and an endothermic effect. The destruction ends at 50C. With a subsequent increase in temperature, the manifestation of endothermic effect continues a temperature of 120175C with the maximum rate of mass loss at 146C. The weight loss ends at about 190C and is 6.5%. The study of MGA-80 and MGA-95 porous cellulose acetate films at transmembrane pressure upon temperature exposure showed that the permeability and specific output flow to water increase as the temperature rises to 50C. Analysis of dependences of the specific output flow on temperature revealed that the specific output flow to water increases by 18% upon an initial temperature rise of 10C. This is due to structural changes in the cellulose acetate layer. A further increase in temperature by 15C leads to an increase in permeability by 10%. These phenomena are associated with the process of structural transformation in the active layer and the polymer substrate of the MGA-95 and MGA-80P membranes, respectively.
Article reference:
Lazarev S.I., Golovin Yu.M., Kovalev S.V., Lazarev D.S., Levin A.A. Influence of thermal effects on the transport characteristics of cellulose acetate porous films, High Temp., 2020. V. 58. № 6. P. 812