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Spherical Polyimide Particles as a Novel Stationary Phase in Liquid Chromatography

机译：球形聚酰亚胺颗粒作为液相色谱中的新型固定相

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Spherical polyimide (PI) particles have been introduced as a stationary phase in liquid chromatography (LC). The PI was prepared with the starting materials of pyromellitic dianhydride (PMDA) and 4,4'-diaminodiphenyl ether (4,4'-oxydianiline, ODA), resulting the spherical PI (PMDA-ODA type) particles with an average diameter of about 5 μm. The synthesized PI particles were packed into a conventional blank LC column having a typical size of 4.6 mm i.d, 150 mm length, and the retention behavior for a group of polycyclic aromatic compounds (PACs) was evaluated in LC. The retention behavior was compared with that obtained on a commercially-available octadecylsilica (ODS) phase. The results indicated a significantly larger retentivity of PACs on the PI stationary phase than that on typical ODS stationary phases, where the retention tendency on the PI phase for various PACs having different molecular size and shape was similar to the trend on the ODS phase. The large retention on the PI phase can be interpreted on the basis of the surface structure of the PI particles, because a number of aromatic functionalities are in the chemical structure of the polymer chain backbone.
机译：球形聚酰亚胺（PI）颗粒已作为固定相引入液相色谱（LC）中。用均苯四酸二酐（PMDA）和4,4'-二氨基二苯醚（4,4'-oxydianiline，ODA）的原料制备PI，得到球形PI（PMDA-ODA型）颗粒，平均直径约为5微米将合成的PI颗粒填充到典型的内径为4.6 mm，长度为150 mm的空白LC色谱柱中，并在LC中评估一组多环芳族化合物（PAC）的保留行为。将保留行为与在商用十八烷基二氧化硅（ODS）相上获得的保留行为进行了比较。结果表明，相比于典型的ODS固定相，PAC在PI固定相上的保留率明显更高，其中具有不同分子大小和形状的各种PAC在PI相上的保留趋势与ODS相上的趋势相似。在PI相上的较大保留可以基于PI颗粒的表面结构来解释，因为在聚合物链主链的化学结构中有许多芳香族官能团。

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