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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Main Authors: Kazuaki Hachiya, Takao Tanaka
Format: Article
Language:English
Published: Japanese Society of Tribologists 2013-05-01
Series:Tribology Online
Subjects:
Online Access:https://www.jstage.jst.go.jp/article/trol/8/3/8_227/_pdf/-char/en
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author Kazuaki Hachiya
Takao Tanaka
author_facet Kazuaki Hachiya
Takao Tanaka
author_sort Kazuaki Hachiya
collection DOAJ
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.
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spelling doaj.art-5331a6a61c21466fba484bfeccbc91222022-12-21T19:44:06ZengJapanese Society of TribologistsTribology Online1881-21982013-05-018322723310.2474/trol.8.227trolRelationship between Friction Coefficient, Contact Angle and Infrared Absorbance of Polypropylene Glycol on Metal SurfaceKazuaki Hachiya0Takao Tanaka1Department of Mechanical System Engineering, Okayama University of ScienceDepartment of Mechanical System Engineering, Okayama University of ScienceThe 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.https://www.jstage.jst.go.jp/article/trol/8/3/8_227/_pdf/-char/enpolypropylene glycolfriction coefficientcompressibilitycontact angleinfrared absorbanceboundary lubricationmetal oxide surface
spellingShingle Kazuaki Hachiya
Takao Tanaka
Relationship between Friction Coefficient, Contact Angle and Infrared Absorbance of Polypropylene Glycol on Metal Surface
Tribology Online
polypropylene glycol
friction coefficient
compressibility
contact angle
infrared absorbance
boundary lubrication
metal oxide surface
title 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_short 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
topic polypropylene glycol
friction coefficient
compressibility
contact angle
infrared absorbance
boundary lubrication
metal oxide surface
url https://www.jstage.jst.go.jp/article/trol/8/3/8_227/_pdf/-char/en
work_keys_str_mv AT kazuakihachiya relationshipbetweenfrictioncoefficientcontactangleandinfraredabsorbanceofpolypropyleneglycolonmetalsurface
AT takaotanaka relationshipbetweenfrictioncoefficientcontactangleandinfraredabsorbanceofpolypropyleneglycolonmetalsurface