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Synthesis of Perfluoro Radiolabeled Lubricants and Their Utilization in Lubricant-Distribution Studies

IP.com Disclosure Number: IPCOM000047439D
Original Publication Date: 1983-Nov-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Afzali, A: AUTHOR [+3]

Abstract

While there are a number of methods to determine lubricant distribution on magnetic disks (surface extraction, ESCA), they do not provide the combination of high surface precision and the ability to evaluate a complete disk in a single, quick evaluation. The use of radiolabeled lubricants permits this kind of evaluation with a precision dependent only on the resolution of the film used for the autoradiography. With standard, single-coated, X-ray films, this precision is in the order of 25-80 microns. Synthesis: The starting material for these syntheses is a ca terminated perfluoro-polypropylene oxide available commercially from the DuPont Corporation under the name KRYTOX 157.

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Synthesis of Perfluoro Radiolabeled Lubricants and Their Utilization in Lubricant-Distribution Studies

While there are a number of methods to determine lubricant distribution on magnetic disks (surface extraction, ESCA), they do not provide the combination of high surface precision and the ability to evaluate a complete disk in a single, quick evaluation. The use of radiolabeled lubricants permits this kind of evaluation with a precision dependent only on the resolution of the film used for the autoradiography. With standard, single-coated, X-ray films, this precision is in the order of 25-80 microns. Synthesis: The starting material for these syntheses is a ca terminated perfluoro-polypropylene oxide available commercially from the DuPont Corporation under the name KRYTOX 157. Although a number of lubricants are usable as a labeled lubricant on magnetic disks, a methyl ester is preferred because of ease of preparation, and its close chemical resemblance to the unlabeled lubricant (RfCF3). The disk is sprayed with the lubricant solution with a precision sprayer, and wiped with a wiping protocol shown to be effective in removing excess lubricant. The disk is placed in a horizontal disk holder, and the selected film placed in contact. The film is held in place by placing an unlubricated disk on top of the film on the labeled disk, and the disk holder closed. It is convenient to place the entire disk holder in a light-tight "changing bag" available from photographic...