Thin-Film Properties of Some Functionalized Perfluoropolyether Boundary Lubricants Based on the n-Perfluoropropylene Oxide Monomer Unit

Autor:	R. J. Waltman, N. Kobayashi
Rok vydání:	2010
Předmět:	Materials science Ethylene oxide Mechanical Engineering Chemical polarity Oxide Surfaces and Interfaces Adhesion Surface energy Surfaces Coatings and Films chemistry.chemical_compound Monomer chemistry Chemical engineering Mechanics of Materials Polymer chemistry Nanotribology Lubricant
Zdroj:	Tribology Transactions. 54:168-177
ISSN:	1547-397X 1040-2004
DOI:	10.1080/10402004.2010.531890
Popis:	The thin-film properties of some perfluoropolyether boundary lubricants based on hydroxyl-termination of the n-perfluoropropylene oxide monomer units are investigated as a function of molecular polarity. The n-perfluoropropylene oxide monomer units provide a stiffer main chain than perfluoropolyethers comprised of a copolymer of perfluoro-methylene oxide and -ethylene oxide monomer units. Terraced flow and bonding kinetics show that the stiffer main chain reduces lubricant mobility on the disk surface but provides a lower profile lubricant film. The lack of mobility attributed to the main chain can be compensated for by decreasing the number of OH end groups. The Hamaker constants, derived from surface energy vs. thickness measurements are larger than the corresponding flexible main chains, suggesting an increased adhesion to the underlying carbon surface.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::f479bdd258c0fc10079b0745a2227565 https://doi.org/10.1080/10402004.2010.531890 Zobrazit plný text záznamu