Polyimide capillary column for gas-liquid chromatography

✍ Scribed by J Balla; M Bálint

• Publisher: Elsevier Science
• Year: 1984
• Tongue: English
• Weight: 576 KB
• Volume: 299
• Category: Article
• ISSN: 1873-3778
• DOI: 10.1016/s0021-9673(01)97827-6

✦ Synopsis

A new principle and method have been developed for producing a high-efficiency WCOT column by forming a polyimide capillary tube of l-5 pm wall thickness inside a supporting glass capillary (tube-in-tube system). This polyimide layer is chemically resistant, heat-proof (up to 450°C) and mechanically stable. Adsorption on the silica surface can be virtually eliminated using this polyimide column. The preparation of the column is simpler than usual because it is not necessary to use pre-treatment or deactivation procedures. The polyimide tube can be coated easily with polar and apolar stationary liquids by dynamic or static coating methods.

The wettability, thermal stability, character of interactions between Carbowaxes and the polymer surface and the adsorption effect of the polyimide tube were investigated. The performance of some polyimide capillary columns is demonstrated with different examples.