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Abstract:
The possibilities of syntheses and the chromatographic properties of reversed-phase materials achieved by polymer coating have been investigated. Special alkylpolysiloxanes, which were to be immobilized on different types of silica, have been synthesized by equilibration of different mixtures of methylhydropolysiloxanes with octamethyltetrasiloxane and subsequent hydrosilylation of 1-alkenes of different chain length. The polymers obtained can easily be immobilized on silica by the usual methods, such as thermal treatment with dicumyl peroxide, γ-radiation, etc. The immobilization is even more effective if the polymer contains a low concentration of SiH bonds. The chromatographic behaviour of such phases in regard to efficiency, selectivity, adsorptivity, and stability has extensively been tested also in comparison with reversed-phase materials obtained by silanization of SiOH groups.
