Improvement of Lubrication
Original Publication Date: 1986-Sep-01
Included in the Prior Art Database: 2005-Mar-09
Commercial perfluorinated lubricants currently used are not monodispersed but rather are a distribution of molecular weights. One measure of its range in molecular weight is called the polydispersity index -- the ratio of its weight average molecular weight to its number average molecular weight. This polydispersity in molecular weight can be substantially reduced by fractionating commercial lube into several molecular weight fractions via molecular distillation or size exclusion chromatography. An experiment was completed which compared a low molecular weight cut of a lubricant to the high molecular weight residue. The conditions were that disks were spun at 6000 RPM at N 40ŒC (close to 3380 file temperatures) for 115 days. The FTIR intensities were measured at 10 days, 20 days, 52 days and 115 days.