一种溶胶-凝胶改性聚二甲基硅氧烷气相色谱柱的制作和分离效果的研究

用醋酸乙烯酯(VAc)与端羟基聚二甲基硅氧烷(hydroxy-teminated PDMS或OH-terminated PDMS)反应得到PDMS-VAc接枝共聚物．以此共聚物为固定液用溶胶一凝胶法制成毛细管气相色谱柱．此色谱柱的分离性能力较强，不仅对于烷烃类和芳烃类等化合物达到有效的分离，而且对酚类和胺类等较难分离的化合物也有令人满意的分离效果．更值得一提的是该柱对各类有机物的混合物的分离也相当出色．测定结果表明该色谱柱对各类化合物，特别是对极性化合物的惰性良好，不对称因子(A)的测定结果均为1．柱效率较高，理论塔板数达到2940／m．该柱且具有良好的稳定性，各类化合物保留时间10次测定的相对标准偏差不超过0．30％．麦氏常数总和测定值为464，表明此固定相已达中等极性．

A New Modified Poly-Dimethylsiloxane and Its Application in Gas Chromatography

PDMS-VAc is obtained from the reaction between VAc and hydroxy-terminated poly-dimethylsiloxane (or OH-terminated PDMS). It is used as stationary phase to make capillary column for gas chromatography by using sol-gel method. The column has a strong separative power, and can not only efficiently separate alkyl compounds and aromatic compounds, but also satisfactorily separate such compounds as hydroxybenzenes and amines which are difficult to separate. What is more, the column can separate various organic compounds quite well. The testing results show that the column has a good inertia for various organic compounds and especially polar compounds. The testing result of unsymmetric gene (A) is 1. This column also shows good column efficiency, satisfactory stability and fine symmetry of the peaks. The testing result of the sum of McReynold's constants is 464, which shows that the polarity of the new stationary phase is stronger than that of PDMS, reaches the middling polarity.