Size exclusion chromatography (XII). Analysis of silicon-phenyl groups in molecular weight components of polydimethylsiloxanes

Technical Report · Fri Aug 01 00:00:00 EDT 1986

OSTI ID:5403247

Kohn, E

Methods for the qualitative and quantitative determination of silicon-phenyl groups in molecular weight components of silicones of the Sylgard type (polydimethylsiloxanes (PDMS)) were developed. On-line size exclusion chromatography was used with differential refractometer (DR), infrared (ir) and ultraviolet (uv) detection, at 254 and 215 nm. For the qualitative analyses the mobile phase was methylene chloride, with uv detection at 254 nm and monitoring for molecular weight distribution in the ir at 9.6 ..mu..m. For the quantitative measurements tetrahydrofuran was the mobile phase and uv detection was at 215 nm. In nonpolar solvents the absorbance of the phenyl group at both 254 and 215 nm is strongly dependent on its position on the PDMS chain, while in more polar solvents the absorbance, at both wavelengths, is less dependent on the phenyl position. The methods are illustrated with the analysis of some Sylgard prepolymers. 6 refs., 8 figs., 3 tabs.

• Research Organization: Mason and Hanger-Silas Mason Co., Inc., Amarillo, TX (USA)
• DOE Contract Number: AC04-76DP00487
• OSTI ID: 5403247
• Report Number(s): MHSMP-86-31; ON: DE86015001
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical & Physicochemical Properties
400301* -- Organic Chemistry-- Chemical & Physicochemical Properties-- (-1987)
ABSORPTION SPECTROSCOPY
AROMATICS
CHEMICAL ANALYSIS
CHROMATOGRAPHY
ELEMENTS
HYDROXY COMPOUNDS
INFRARED SPECTRA
ORGANIC COMPOUNDS
ORGANIC SILICON COMPOUNDS
PHENOLS
POLYMERS
QUALITATIVE CHEMICAL ANALYSIS
QUANTITATIVE CHEMICAL ANALYSIS
SEMIMETALS
SEPARATION PROCESSES
SILICON
SILICONES
SILOXANES
SPECTRA
SPECTROSCOPY
ULTRAVIOLET SPECTRA