Abstract

This paper presents an analytical overview of the study of the kinetic and physicochemical characteristics of composite membrane films. UAM-100, UAM-150, and MGA-95 composite films have been studied using thermogravimetry in the temperature range from 30 to 300°C. A kinetic analysis of experimental data by the Freeman–Carroll method is carried out. It was found that hydrated water for all the studied semi-permeable films evaporates in the temperature range from ~95 to ~180°C. Comparison of the ratios of the amount of removed water in the film samples correlates with the geometric parameters of the pores. The values of the activation energy and the pre-exponential factor (E = 26.9 kJ/mol and ln(A ≈ 6.3 (min^–1)) in the range 0.2 < α < 0.7 of the degree of dehydration indicate the same regularity in the distribution of water molecules in the polymolecular layer for all composite films. The high dehydration values, e.g., for a sample of a composite semipermeable film MGA-95 at the temperature of the maximum on the thermogravimetry curve (T_max = 169.6°C) indicate that water molecules form hydrogen bonds both with ionogenic groups of cellulose acetate and with each other.

中文翻译：

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UAM-100，UAM-150和MGA-95复合膜中醋酸纤维素层脱水的热重研究

摘要

本文介绍了复合膜薄膜的动力学和理化特性研究的分析概述。UAM-100，UAM-150和MGA-95复合膜已使用热重分析法在30至300°C的温度范围内进行了研究。通过Freeman-Carroll方法对实验数据进行动力学分析。已发现，所有研究的半透膜的水合水在〜95至〜180°C的温度范围内蒸发。膜样品中去除水量的比率的比较与孔的几何参数相关。活化能和预指数因子（的值ê = 26.9千焦/摩尔和ln（甲≈6.3（分钟^-1））在脱水度的0.2 <α<0.7范围内，表明所有复合膜在多分子层中水分子的分布规律相同。高脱水值（例如，复合半透膜MGA-95的样品在热重曲线上的最大值（T _max = 169.6°C）下的_最高温度）表明水分子与乙酸纤维素的离子基团均形成氢键彼此之间。