文献类型：会议论文

英文题名：Vapor-liquid equilibria for mixed solvents-polymer systems, measurement and correlation

作者：Liu, Honglai[1]; Huang, Yongmin[1]; Wang, Kun[1]; Hu, Ying[1]

机构：[1]E China Univ Sci & Technol, Dept Chem, Shanghai 200237, Peoples R China

会议论文集：9th International Conference on Properties and Phase Equilibria for Product and Process Design

会议日期：MAY 20-25, 2001

会议地点：KURASHIKI, JAPAN

语种：英文

外文关键词：vapor-liquid equilibrium; polymer solution; mixed solvent; experiment; equation of state

摘要：VLE data for mixed solvents-polymer systems are rare in literature. The pivotal problem in the measurement is how to accurately determine compositions of mixed solvents. In this work, a new experimental method is presented by combining quartz spring weighing and material balance. To improve the accuracy, 21 baskets containing polymer powder are used to increase the total amount of mixed solvents being adsorbed. One of these baskets is used as a monitor, while the weight of the others can be estimated. The quantity of mixed solvents in vapor phase is calculated from the pVT data measured simultaneously. Both liquid and vapor compositions are then determined by material balance, VLE data for four mixed solvents-polymer ternary systems. butanone-toluene-poly(methyl methacrylate)(PMMA), butanone-acetone-PMMA, benzene-toluene-polystyrene(PS) and benzene-toluene-PMMA at 308.15 K, have been measured. The solubility of butanone in PMMA is enhanced due to the existence of toluene, while the solubility of toluene in PMMA is lowered due to the existence of butanone. The solubilities of acetone and butanone in butanone-acetone-PMMA ternary system, as well as those of benzene and toluene in benzene-toluene-PS ternary system, are consistent to those in the corresponding binary polymer solutions. The results were correlated by an equation of state developed previously for polymer systems. (C) 2002 Elsevier Science B.V. All rights reserved.