混合溶剂在高分子中的溶解和传递现象研究

An experimental apparatus for the measurements of the solubility and transport phenomena of mixed-solvent in polymer membranes by combining quartz spring weighing and material balance. To improve the accuracy, multi-sample cells are used to increase the total amount of mixed solvents being adsorbed. The vapor-liquid equilibrium data and adsorption kinetic curves of four mixed-solvent/polymer systems have been measured using this apparatus. The thermodynamic and transport properties such as vapor-liquid equilibrium data, infinite diluted activity coefficients, infinite diluted diffusion coefficients for some single-solvent/polymer systems have also been measured by using quartz spring weighing, inverse gas chromatography and quartz crystal microbalance methods. A mutual-diffusion-coefficient model based on local-composition concept, two transport models for mixed solvents in glassy polymer membrane based on adsorption/absorption dual-mode theory and based on creep of polymer/mixing theory and a molecular thermodynamic model for copolymer systems have been developed. The correlated results for the experimental data are satisfactorily.

用石英弹簧称重与系统物料衡算相结合、采用多个样品池提高测量精度的方法测定混合溶剂在高分子膜中的溶解度和吸收动力学数据，解决确定膜中混合溶剂组成及其随时间变化的难题；建立混合溶剂-高分子系统的分子热力学模型和分子传递模型；通过传递性质的测定推飧叻肿幽の⒐劢峁埂Ｍ贫肿尤攘ρШ痛堇砺垩芯浚し掷牍毯湍げ牧咸峁┲傅肌