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Influence of Thermal Effects on the Transport Characteristics of Cellulose Acetate Porous Films
High Temperature ( IF 1 ) Pub Date : 2021-03-10 , DOI: 10.1134/s0018151x20060139
S. I. Lazarev , Yu. M. Golovin , S. V. Kovalev , D. S. Lazarev , A. A. Levin

Abstract

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 21°C. It is accompanied by a 2% weight loss and an endothermic effect. The destruction ends at 50°C. With a subsequent increase in temperature, the manifestation of endothermic effect continues a temperature of 120–175°C with the maximum rate of mass loss at 146°C. The weight loss ends at about 190°C 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 50°C. 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 10°C. This is due to structural changes in the cellulose acetate layer. A further increase in temperature by 15°C 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.



中文翻译:

热效应对醋酸纤维素多孔膜传输特性的影响

摘要

获得了实验数据,并通过热作用分析了醋酸纤维素多孔材料的水分含量和渗透性。动态热重分析发现,空气干燥的膜样品的破坏过程始于21°C。它伴随着2%的体重减轻和吸热作用。破坏在50°C结束。随着温度的随后升高,吸热效应的表现继续在120–175°C的温度下以146°C的最大质量损失速率进行。重量损失在约190℃下结束并且为6.5%。对MGA-80和MGA-95多孔醋酸纤维素多孔膜在暴露于温度下进行跨膜压力的研究表明,当温度升至50°C时,对水的渗透性和比输出流量增加。分析特定输出流量对温度的依赖性后发现,当初始温度升高10°C时,水的特定输出流量将增加〜18%。这是由于乙酸纤维素层中的结构变化。温度再升高15°C,导磁率提高〜10%。这些现象分别与MGA-95和MGA-80P膜的活性层和聚合物基质中的结构转变过程有关。

更新日期:2021-03-10
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