Determination of silanol in silicones by quantitative FTIR
A great many two-component silicone resins depend upon the reaction of a silane-hydrogen containing (SiH) material with a silanol containing (SiOH) material. There are many methods that work quite well for the quantitation of SiH. There are probably even more methods available for SiOH determination. Unfortunately, most of them suffer from large disadvantages. This laboratory has has tried nearly every available method for silanol analysis in an effort to find a reliable one. As a result, an infrared method has been developed that is not only fast and reliable but has very vew interferences. The method involves measuring the absorbance of the non-bonded SiOH band (3685 cm-1) of very dilute solutions of the silanol in carbon tetrachloride. The analysis is performed on an FTIR spectrophotometer, and the effects of moisture and other interfering species are digitally subtracted. The choice of a suitable standard silanol proved to be one of the most difficult problems to overcome, since the absorptivity coefficient is somewhat structure dependent. The method is now being used on a routine basis.
- Research Organization:
- Bendix Corp., Kansas City, MO (USA)
- DOE Contract Number:
- AC04-76DP00613
- OSTI ID:
- 5041540
- Report Number(s):
- BDX-613-2825; CONF-820850-1; ON: DE82020342
- Resource Relation:
- Conference: Society for Applied Spectroscopy and Rocky Mountain Chromatography Group conference, Denver, CO, USA, 1 Aug 1982
- Country of Publication:
- United States
- Language:
- English
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