极性和非极性溶剂在聚乙烯中的无限稀释扩散系数的测定  

Measurement of Diffusion Coefficients of Polar Solvent and Nonpolar Solvent at Infinite Dilution in Polyethylene

作　　者：边宇[1] 李继定[1] 陈翠仙[1] 吕少华[1] 张树华[1] 

机构地区：[1]清华大学化工系膜技术和工程研究中心,北京100084

出　　处：《色谱》2002年第5期411-414,共4页Chinese Journal of Chromatography

基　　金：国家自然科学基金和清华大学基础基金资助项目 (B0 6 0 30 8)

摘　　要：气相色谱法研究小分子溶剂与高分子聚合物材料之间的相互作用是一个快速、准确、方便的方法 ,可以测量多种小分子溶剂在聚合物中的溶解、扩散参数。通过气相色谱法测定了 5种小分子溶剂 (正己烷、正庚烷、正癸烷、乙醇和水 )在固定液聚乙烯中的保留时间和半峰宽 ,运用vanDeemter模型进行数据处理 ,得到上述 5种小分子在聚乙烯中的无限稀释扩散系数 。Gas chromatography is a new, fast, accurate and convenient technique to study the correlation of small molecule solvents and polymer membrane materials. It can measure many parameters of dissolution and diffusing characters of a small molecule in a polymer. The retention times and the peak widths at half height of five small molecule solvents ( n hexane, n heptane, n decane, ethanol and water) in the stationary phase of polyethylene were measured. The diffusion coefficients of the small molecule solvents at infinite dilution were calculated with van Deemter equation. The graph plotted according to the results of the diffusion coefficients of n decane at infinite dilution vs temperatures agreed with the Arrhenius equation. The variance in the diffusion coefficients at infinite dilution of five small molecule solvents was analyzed according to the differences in molecular mass and polarity.

关 键 词：非极性溶剂 无限稀释扩散系数 测定 气相色谱 小分子溶剂 低密度聚乙烯 极性溶剂 

分 类 号：O645.14[理学—物理化学] O632.12[理学—化学]