Accession Number:

AD0621566

Title:

NMR ANALYSIS OF MIXED PENTAERYTHRITOL DIPENTAERYTHRITOL, AND 1, 1, 1-TRIMETHYLOPROPANE ESTERS.

Descriptive Note:

Final rept.,

Corporate Author:

NAVAL RESEARCH LAB WASHINGTON D C

Personal Author(s):

Report Date:

1965-08-19

Pagination or Media Count:

23.0

Abstract:

Benzene solutions of mixed pentaerythritol, dipentaerythritol, and 1, 1, 1-trimethylolpropane esters may be quantitatively assayed by proton NMR spectroscopy with an absolute accuracy of 5 mole- for each of the ester types. Higher accuracies are possible if a calibration curve is used. Average acid chain length and the approximate degree of chain branching are also obtained. The NMR method can be used for monitoring base stocks, checking blend compositions, and determining constancey of formulation of oils qualified under specification MIL-L23699. NMR analyses of a group of commercial esters and of several aircraft engine lubricant formulations were made. Results were obtained on both the Varian A-60 and HA-100 spectrometers, with comparable accuracy. The A-60 is felt to be the preferred instrument, however, because its integrals are simpler to process. Author

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE