Application of gel permeation chromatography to determination of the molecular weight distribution of polyorganosiloxanes

An universal calibration curve for polystyrene, polydimethylsiloxane and polymethylphenylsiloxane has been obtained by means of a combination of the GPC and viscometric methods. The MWD of polydimethylsiloxane has been determined by use of the universal calibration curve and this is compared with the MWD obtained by high speed sedimentation in the ultracentrifuge.