三种芳烃溶剂在低密度聚乙烯膜材料中无限稀释扩散系数的测定

Measurement of Diffusion Coefficients of Three Aromatic Solvents at Infinite Dilution in Low Density Polyethylene Membrane Material

用气相色谱法测定了苯、甲苯和乙苯在固定液低密度聚乙烯中的保留时间和半峰宽,运用vanDeem ter模型进行数据处理,得到3种芳烃小分子在低密度聚乙烯膜材料中的无限稀释扩散系数.

The retention time and the peak widths at half-height of benzene, toluene and ethylbenzene in the stationary phase of low density polyethylene were obtained by using gas chromatography. The diffusion coefficients of the small molecule solvents at infinite dilution were calculated with van Deemter equation. The graphs plotted according to the results of the diffusion coefficients of the three aromatic solvents at infinite dilution vs. temperatures were in agreement with the Arrhenius equation. The variance in the diffusion coefficients at infinite dilution of three aromatic solvents was analyzed according to the differences in molecular mass.