Relationship between Friction Coefficient, Contact Angle and Infrared Absorbance of Polypropylene Glycol on Metal Surface

The kinematic viscosities in the undiluted solutions of propylene glycol and the polypropylene glycols were proportional to their molecular weights, but the friction coefficients and compressibilities in polypropylene glycols hardly depended on their molecular weights except for those in propylene g...

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Autores principales:	Kazuaki Hachiya, Takao Tanaka
Formato:	article
Lenguaje:	EN
Publicado:	Japanese Society of Tribologists 2013
Materias:	polypropylene glycol friction coefficient compressibility contact angle infrared absorbance boundary lubrication metal oxide surface Physics QC1-999 Engineering (General). Civil engineering (General) TA1-2040 Mechanical engineering and machinery TJ1-1570 Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/5331a6a61c21466fba484bfeccbc9122
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spelling	oai:doaj.org-article:5331a6a61c21466fba484bfeccbc91222021-11-05T09:24:16ZRelationship between Friction Coefficient, Contact Angle and Infrared Absorbance of Polypropylene Glycol on Metal Surface1881-219810.2474/trol.8.227https://doaj.org/article/5331a6a61c21466fba484bfeccbc91222013-05-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/trol/8/3/8_227/_pdf/-char/enhttps://doaj.org/toc/1881-2198The kinematic viscosities in the undiluted solutions of propylene glycol and the polypropylene glycols were proportional to their molecular weights, but the friction coefficients and compressibilities in polypropylene glycols hardly depended on their molecular weights except for those in propylene glycol. In the friction coefficient measurement, the sliding metal surface was oxidized by strong mechanical shearing force and heat. The boundary lubricant film formation between the polypropylene glycols and the metal oxide layer on the sliding surface was investigated by the contact angle and infrared absorption measurements. The contact angle of the polypropylene glycol at 40°C decreased with an increase in the heat-treated temperature of the metal plate. The infrared absorbance of the polypropylene glycol at 3496 cm-1 was proportional to the lubricant film thickness, but the absorbance intercept in the plot of the absorbance vs. the film thickness was negative at zero film thickness. The negative intercept indicates that the hydroxyl group of the polypropylene glycol disappeared owing to the adsorption of the lubricant molecules to the metal oxide surface. The molecular weight dependence of the friction coefficient was explained by the boundary lubricant film formation of the polypropylene glycol on the metal oxide surface.Kazuaki HachiyaTakao TanakaJapanese Society of Tribologistsarticlepolypropylene glycolfriction coefficientcompressibilitycontact angleinfrared absorbanceboundary lubricationmetal oxide surfacePhysicsQC1-999Engineering (General). Civil engineering (General)TA1-2040Mechanical engineering and machineryTJ1-1570ChemistryQD1-999ENTribology Online, Vol 8, Iss 3, Pp 227-233 (2013)
institution	DOAJ
collection	DOAJ
language	EN
topic	polypropylene glycol friction coefficient compressibility contact angle infrared absorbance boundary lubrication metal oxide surface Physics QC1-999 Engineering (General). Civil engineering (General) TA1-2040 Mechanical engineering and machinery TJ1-1570 Chemistry QD1-999
spellingShingle	polypropylene glycol friction coefficient compressibility contact angle infrared absorbance boundary lubrication metal oxide surface Physics QC1-999 Engineering (General). Civil engineering (General) TA1-2040 Mechanical engineering and machinery TJ1-1570 Chemistry QD1-999 Kazuaki Hachiya Takao Tanaka Relationship between Friction Coefficient, Contact Angle and Infrared Absorbance of Polypropylene Glycol on Metal Surface
description	The kinematic viscosities in the undiluted solutions of propylene glycol and the polypropylene glycols were proportional to their molecular weights, but the friction coefficients and compressibilities in polypropylene glycols hardly depended on their molecular weights except for those in propylene glycol. In the friction coefficient measurement, the sliding metal surface was oxidized by strong mechanical shearing force and heat. The boundary lubricant film formation between the polypropylene glycols and the metal oxide layer on the sliding surface was investigated by the contact angle and infrared absorption measurements. The contact angle of the polypropylene glycol at 40°C decreased with an increase in the heat-treated temperature of the metal plate. The infrared absorbance of the polypropylene glycol at 3496 cm-1 was proportional to the lubricant film thickness, but the absorbance intercept in the plot of the absorbance vs. the film thickness was negative at zero film thickness. The negative intercept indicates that the hydroxyl group of the polypropylene glycol disappeared owing to the adsorption of the lubricant molecules to the metal oxide surface. The molecular weight dependence of the friction coefficient was explained by the boundary lubricant film formation of the polypropylene glycol on the metal oxide surface.
format	article
author	Kazuaki Hachiya Takao Tanaka
author_facet	Kazuaki Hachiya Takao Tanaka
author_sort	Kazuaki Hachiya
title	Relationship between Friction Coefficient, Contact Angle and Infrared Absorbance of Polypropylene Glycol on Metal Surface
title_short	Relationship between Friction Coefficient, Contact Angle and Infrared Absorbance of Polypropylene Glycol on Metal Surface
title_full	Relationship between Friction Coefficient, Contact Angle and Infrared Absorbance of Polypropylene Glycol on Metal Surface
title_fullStr	Relationship between Friction Coefficient, Contact Angle and Infrared Absorbance of Polypropylene Glycol on Metal Surface
title_full_unstemmed	Relationship between Friction Coefficient, Contact Angle and Infrared Absorbance of Polypropylene Glycol on Metal Surface
title_sort	relationship between friction coefficient, contact angle and infrared absorbance of polypropylene glycol on metal surface
publisher	Japanese Society of Tribologists
publishDate	2013
url	https://doaj.org/article/5331a6a61c21466fba484bfeccbc9122
work_keys_str_mv	AT kazuakihachiya relationshipbetweenfrictioncoefficientcontactangleandinfraredabsorbanceofpolypropyleneglycolonmetalsurface AT takaotanaka relationshipbetweenfrictioncoefficientcontactangleandinfraredabsorbanceofpolypropyleneglycolonmetalsurface
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Relationship between Friction Coefficient, Contact Angle and Infrared Absorbance of Polypropylene Glycol on Metal Surface

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