Title

Residual Hydrogen Determination in Perfluoropolyalkylethers Using Fourier Transform Infrared and Proton Nuclear Magnetic Resonance Spectroscopies

Document Type

Article

Publication Date

1995

Publication Source

Applied Spectroscopy

Abstract

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.

Inclusive pages

1474-1477

ISBN/ISSN

0003-7028

Document Version

Published Version

Comments

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.

Publisher

The Optical Society

Volume

49

Issue

10

Peer Reviewed

yes