HIGH-TEMPERATURE LUBRICANTS FROM AROMATIC ACIDS AND FLUOROALCOHOLS

Technical Report · Tue Sep 23 04:00:00 EDT 1958

OSTI ID:4313025

Murphy, C M; O'Rear, J G; Ravner, H; Sniegoski, P J; Timmons, C O

Aircraft gas-turbine engines soon to become operational will require lubricants which are considerably more resistant to pyrolysis and oxidation than are the alkyl diesters covered by Specification MIL-L-7808. Previous research at NRL revealed that fluoroalcohol esters of aliphatic acids had improved oxidation stability but were relatively volatile. To obtain esters with decreased volatility and increased stability, studies were extended to fluoroesters derived from aromatic acids, including the potentially available acids 2-phenylsuccinic, 2-phenylglutaric, diphenyl-2,2'-dicarboxylic or diphenic, and diphenyl ether 4,4'- dicarboxylic. The diphenate is preferred because of its oxidation stability at 527 F, its thermal stability ai 600 F, and its lower volatility as compared with fluoroalcohol esters of aliphatic acids. These gains are made at some expense of viscometric properties and freezing point. The results of this investigation open the way to more stable and less volatile fluoroesters which offer promising candidates for hightemperature jet-engine lubricants. (auth)

• Research Organization: Naval Research Lab., Washington, D.C.
• NSA Number: NSA-13-002731
• OSTI ID: 4313025
• Report Number(s): NRL-5223; Project NA-350-063
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ALCOHOLS
ALKYL RADICALS
AROMATIC HYDROCARBONS
AROMATICS
CARBOXYLIC ACIDS
CHEMICAL REACTIONS
CHEMICALS
CHEMISTRY
COMPOUNDS
ESTERS
FLUORINATED HYDROCARBONS
GLUTARIC ACID
HIGH TEMPERATURE
JETS
LUBRICATION
MEASURED VALUES
MELTING POINTS
MOTORS
ORGANIC ACIDS
ORGANIC FLUORINE COMPOUNDS
OXIDATION
PHENOLS
PHENYL RADICALS
PREPARATION
PYROLYSIS
SUCCINIC ACID
USES
VISCOSITY
VOLATILITY