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Capillary columns with immobilized stationary phases. Part 3: The basic influence of vinyl groups

✍ Scribed by Grob, K. ;Grob, G.

Publisher
John Wiley and Sons
Year
1981
Tongue
English
Weight
333 KB
Volume
4
Category
Article
ISSN
0935-6304

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✦ Synopsis

Abstract

This article presents a preliminary description of the influence exerted by vinyl groups on the process and on the result of immobilization. Vinyl groups may occur in the stationary phase (e. g. in SE‐54) or may be bound to the support surface by persilylation with divinyltetramethyldisilazane. In the first case they promote the crosslinking process in the stationary phase. In the second case bonding to the solid surface is intensified. We have observed that vinyl groups in both situations contribute with comparable efficiency to the final non‐extractability of the stationary phase. A further, yet entirely independent influence of surface‐bonded vinyl groups concerns the acidity of the column. Whereas regular persilylation produces slightly acidic columns, a substantial shift to basic column behavior is observed after persilylation with a vinyl‐containing reagent. The potential future importance of both kinds of influence is discussed.

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