Synthesis and Structure-Activity Correlation of Additives for Perfluoropolyalkyether Base Fluids
Abstract
Seventeen novel phosphates/phosphonates were developed as potential additives for perfluoropolyalkylether fluids to inhibit thermal oxidative degradation (in the presence of metals), to provide rust protection, and to enhance lubricity. The materials comprised aromatic phosphates and phosphonates as well as partially esterified compounds, wherein the benzene rings were substituted by perfluoroalkyl and perfluoroalkylether chains. The effects of the substituents on materials' hydrolytic stability and solubility in perfluoropolyalkylether fluids, Krytox 143AC, Demnum S-100 and Fomblin Z25, were determined. The optimum composition, identified to provide thermal oxidative degradation inhibition (at 330 deg C, over 24 h in the presence of metals), rust protection and lubricity enhancement was a mixture of: ?C3F7OCF(CF3)CF23C6H4O!2P (O) OC6H5 and C3F7OCF(CF3)CF23C6H4OP (O) (OC6H5) OH.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 01, 1997
- Accession Number
- ADA353023
Entities
People
- K. J. Paciorek