Abstract
The thermal immobilization of polysiloxanes bearing carboxyalkyl functional groups has been investigated. Under conditions of reduced carrier-gas flow, in particular with water vapour saturated, carrier-gas, high degrees of immobilization could be achieved at moderate temperatures (<200°C). The mechanism of immobilization is shown two involve condensation of carboxyl groups of the polysiloxane with silanol groups either originally present in the polymer or formed during the immobilization process. Other polysiloxane stationary phases could also be immobilized under similar conditions when mixed with carboxyalkyl polysiloxanes. In particular, cyanoalkyl silicones which are otherwise difficult to crosslink, are amenable to this form of immobilisation.
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