Time-Temperature Studies of High Temperature Deterioration Phenomena in Lubricant Systems: Synthetic Ester Lubricants
Final rept. 1 Apr 76-30 Sep 79,
FORD MOTOR CO DEARBORN MI RESEARCH STAFF
Pagination or Media Count:
A kinetic and mechanistic study of the autoxidation of liquid pentaerythrityl tetraheptanoate, PETH, in a stirred flow reactor at 180 to 220 C was completed. The results are consistent with the occurrence of a chain reaction scheme similar to that proposed for n-hexadecane autoxidation. This scheme includes the formation of monohydroperoxides by an intermolecular abstraction reaction, formation of alpha, gamma and alpha, delta- dihydroperoxides and hydroperoxyketones by intramolecular peroxy radical abstraction reactions and bimolecular termination reaction of peroxy radicals, and rapid conversion of alpha, gammma-hydroperoxyketones to cleavage acids and methylketones. Based upon the results of these inhibited autoxidation studies a method for establishing the relationships between structure and thermoxidative stability of synthetic ester lubricants has been developed.
- Organic Chemistry
- Lubricants and Hydraulic Fluids