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New silarylene/methylphenylsiloxane copolymer stationary phase for open tubular gas chromatography

✍ Scribed by Karel Janák; Ingela Hägglund; Lars G. Blomberg; Saturnin G. Claude; Raffaele Tabacchi

Publisher
John Wiley and Sons
Year
1991
Tongue
English
Weight
495 KB
Volume
3
Category
Article
ISSN
1040-7685

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✦ Synopsis

Abstract

A new silanol‐terminated silarylene/siloxane copolymer, having 30% phenyl and 1.5% vinyl substitution, has been evaluated for use as a stationary phase in gas chromatography. The polymer was found to be auto‐cross‐linkable. The highest degree of immobilization (90%) was obtained at relatively low temperatures (300°C). The auto‐cross‐linking at lower temperatures might be due to a silanol catalyzed reaction of vinyl groups. At higher temperatures (350–370°C) scission of phenyl groups and the formation of branched structures are the dominating immobilization reactions. Column polarity is thereby decreased.

Thermal stability was excellent at 370°C after conditioning at this temperature. The utility of the columns was illustrated by the separation of polycyclic aromatic compounds.

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