Size Exclusion Chromatography (XIII): Identification and Quantitation of Silicon Hydride Containing Oligomeric Components of Sylgard Prepolymers

摘要

Methods for the identification and quantitation of oligomeric, silicon hydride (SiH), containing components of Sylgard prepolymers (polydimethylsiloxane: PDMS) have been developed. They employ a combination of size exclusion chromatography (SEC), with infrared (ir) and differential refractometer (DR) detection and gas chromatography/mass spectrometry (GC/MS) verification. The identified oligomers were present at about 20% of total prepolymer and contained from one to six SiH linkages per molecule. Such lower molecular weight oligomers may contribute to the vapor pressure of resins prepared from the prepolymers since they may contain a significant number of molecules which have only one or two SiH groups and are not capable of forming large polymeric structures. 5 refs., 8 figs., 2 tabs. (ERA citation 13:018689)