Add time:07/25/2019         Source:sciencedirect.com

The compositions of commercial cyano-containing polysiloxane stationary phases were determined using infrared, nuclear magnetic resonance, and proton-induced X-ray emission spectroscopies. Varying amounts of the polar carboxamide group were found in most polymers. This group, which is inadvertently formed during the hydrolysis step in the synthesis of the polymers, affects the polarity and selectivity of the phase. The chloride ion (believed to be present as HCl as a result of the synthesis from dichlorosilane monomers) was also detected. A specially synthesized 88% cyanopropyl polysiloxane from dimethoxysilane monomers, containing no detectable carboxamide groups or adsorbed HCl, possessed different properties than the comparable commercially available phases.

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