The residual hydrogen content of several perfluoropolyalkylether base fluids has been determined with the use of proton nuclear magnetic resonance (NMR) and Fourier transform infrared (FT-IR) spectroscopies. The analysis of standard samples gives a linear calibration curve for hydrogen concentrations between 0.5 and 500 ppm for both FT-IR and NMR. The two methods have similar detection limits of about 1 ppm. Analysis of identical samples of Krytox 143 AC and Krytox 143 AZ by both methods gives results which are in excellent agreement. The two methods also provide information about the chemical environment in which the hydrogen is located. In both of the Krytox samples, the hydrogen is located in CFH groups within the polymer chain. Index Headings: Perfluoropolyalkylether (PFPAE); FT-IR; NMR; Residual hydrogen.
- Analytical Chemistry,
- Biochemical Phenomena, Metabolism, and Nutrition,
- Chemical and Pharmacologic Phenomena,
- Chemistry,
- Environmental Chemistry,
- Inorganic Chemistry,
- Materials Chemistry,
- Medical Biochemistry,
- Medicinal-Pharmaceutical Chemistry,
- Organic Chemistry,
- Other Chemistry and
- Physical Chemistry
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The authors acknowledge the support of this project by the Materials Directorate of Wright Laboratory and by the Air Force Office of Scientific Research through its Summer Faculty Research Program at Wright-Patterson Air Force Base. NMR instrumentation used in this study was provided by a donation from Procter and Gamble to the University of Dayton. The authors would also like to express their appreciation to Dr. K. J. Eisentraut, Ms. L. J. Gschwender, and Mr. C. E. Snyder Jr., for assistance and encouragement.