Isothermal retention indices on poly(3-cyanopropylmethylsiloxane) stationary phases.

Experimental isothermal retention indices (I) at 348, 363, 378 and 393 K of 52 solutes of varied polarity on seven different poly(cyanopropylmethylsiloxane) stationary phases with cyanopropyl group percentages between 0% and 75% have been determined by a well-proven, accurate method. Some of these I values were obtained on new stationary phases with cyanopropyl percentages never used before. The influence of column temperature and polymer polarity on I was thoroughly investigated. Finally, retention models were developed relating I values to physicochemical and molecular properties by multiple linear regression. The best model of retention index prediction for the proposed cyanosilicones involves the Abraham's descriptors.