环己烷在聚乙烯和聚异丁烯中无限稀释扩散系数的测定-上海有机化学.PDFVIP

2001 年第 59 卷 化 学 学 报 Vol. 59 , 2001 第 1 期 , 34～38 ACTA CHIMICA SINICA No. 1 , 34 ～38 环己烷在聚乙烯和聚异丁烯中无限稀释扩散系数的测定 蒋文华　　刘　华　　韩世钧 (浙江大学化学系 　杭州 　310027) 摘要 　采用填充柱的反相气相色谱方法 ,基于 Hadj - Romdhane - Danner 色谱过程的数学模型 ,在 323. 2～363. 2K 温 度范围内测定了环己烷在聚异丁烯和聚乙烯膜中的无限稀释扩散系数. 从实验数据可以看出 ,环己烷更容易在 PIB 中发生扩散. 对实测扩散数据进行了自由体积理论关联 ,结果表明 ,采用空穴自由体积替代 Vrentas - Duda 自由体积 理论方程中自由体积项的修正方程能很好地描述溶剂分子扩散系数随温度的变化关系. 关键词 　高分子膜 ,无限稀释扩散系数 , 自由体积理论 Measurement of Infinite Dilution Diffusion Coefficients of Cyclohexane in Polyethylene and Polyisobutylene J IANG Wen - Hua 　　LIU Hua 　　HAN Shi - Jun ( Department of Chemistry , Zhejiang University , Hangzhou , 310027) Abstract 　Based on the Hadj - Romdhane - Danner mathematical model of the chromatographic process , the infinite dilution diffusion coefficients of cyclohexane in polyethylene ( PE) and polyisobutylene ( PIB) were measured in the temperature range between 323. 2 and 363. 2K by reverse gas chromatography. The experimental data show that the diffusion data of cyclohexane in PE are smaller than those in PIB at the same temperature ,which indicates that the diffusion of cyclohexane in PE membrane is more difficult if compared with PIB membrane. The correlation of the experimental data was performed by using the modified Vrentas - Duda free - volume equation , where the hole free volume was introduced instead of the whole free volume