环二硅氮烷-聚硅氧烷共聚物高温气相色谱固定相的研究

含苯基的环二硅氮烷聚硅氧烷共聚物(TMCDPS)主链上含有刚性结构,具有良好的耐热性能。将此材料用作毛细管气相色谱固定相,考察该固定相的柱效、极性、热稳定性,并对石蜡、聚乙烯裂解产物、原油等样品进行色谱分析。实验结果表明:该固定相有着良好的分离效果,属于中等极性固定相,其最为突出的特点就是在聚硅氧烷主链上引入大分子基团,使得其耐温性能大大提高,温度达到400℃时,柱流失量依然不高。

[1,1,6,6-tetraphenyl-3,3,5,5-tetramethylcyclodisilazane-1,6-sil-2,4-diyl]-diphenylsiloxane copolymer as stationary phase in gas chromatography

1,1,6,6-tetraphenyl-3,3,5,5-tetramethylcyclodisilazane-1,6-sil-2,4-diyl]-diphenylsiloxane copolymer(TMCDPS) showed good thermal stability,with rigid construction in the main chain.It was used as stationary phase of capillary column in gas chromatography for the first time.In this paper,its chromatographic properties were investigated by using different probes and detecting paraffin,polyethylene pyrolysis and petroleum.The results showed that it was a good stationary phase with good separation ability,and it has showed medium polarity,high thermal stability and low column bleeding,result from added the rigid construction in the main chain.When the temperature was up to 400℃,the column bleeding was low.Above the data that the stationary phase has showed fine chromatographic properties and it was promising as gas stationary phase.