High performance size exclusion chromatography (IX) bulk and component analysis of silanol groups in polydimethylsiloxanes
Methods for the bulk and molecular weight component analysis of hydroxyl groups attached to silicon in polydimethylsiloxanes of the Sylgard type have been developed. The infrared (ir) absorbance band of the silanol adduct produced by hydrogen bonding with 1,4-dioxane is used. The determination of hydroxyl content as a function of molecular weight employs an on-line size exclusion chromatography-infrared (SEC-IR) technique. Interference by vinyl or phenyl groups in the sample or by traces of water in the solvent was negligible, but water or compounds containing other types of hydroxyl groups interfered. Sensitivity of the method is about 10 ..mu..g of the silanol, as OH in the polydimethylsiloxane. Primary calibration was by proton nuclear magnetic resonance (PNMR) at a high concentration of hydroxyl groups.
- Research Organization:
- Mason and Hanger-Silas Mason Co., Inc., Amarillo, TX (USA)
- DOE Contract Number:
- AC04-76DP00487
- OSTI ID:
- 6019122
- Report Number(s):
- MHSMP-85-06; ON: DE85006853
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360402* -- Polymers & Plastics-- Structure & Phase Studies-- (-1987)
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400102 -- Chemical & Spectral Procedures
CALIBRATION
CHROMATOGRAPHY
HYDROGEN COMPOUNDS
HYDROXIDES
MOLECULAR WEIGHT
ORGANIC COMPOUNDS
ORGANIC SILICON COMPOUNDS
OXYGEN COMPOUNDS
POLYMERS
SEPARATION PROCESSES
SILICONES
SILOXANES
STRUCTURAL CHEMICAL ANALYSIS