Relation between Dielectric Relaxation and Rheological Properties of Lubricating Greases

The dielectric spectroscopy method was applied to the investigation of the dynamics of base oil and thickener of lubricating grease. In order to observe the dielectric relaxations both of base oil and thickener, the lubricating grease formed from polyol ester base oil and lithium 12-hydroxy stearate...

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Autores principales:	Akihito Suzuki, Shinichi Kotake, Masabumi Masuko, Yukitoshi Fujinami
Formato:	article
Lenguaje:	EN
Publicado:	Japanese Society of Tribologists 2012
Materias:	lubricating grease dielectric relaxation rheology base oil thickener molecular motion polyol ester lithium 12-hydroxy stearate 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/53e67a4c3f9f4053b41d366ff38eb49a
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spelling	oai:doaj.org-article:53e67a4c3f9f4053b41d366ff38eb49a2021-11-05T09:24:57ZRelation between Dielectric Relaxation and Rheological Properties of Lubricating Greases1881-219810.2474/trol.7.165https://doaj.org/article/53e67a4c3f9f4053b41d366ff38eb49a2012-09-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/trol/7/3/7_165/_pdf/-char/enhttps://doaj.org/toc/1881-2198The dielectric spectroscopy method was applied to the investigation of the dynamics of base oil and thickener of lubricating grease. In order to observe the dielectric relaxations both of base oil and thickener, the lubricating grease formed from polyol ester base oil and lithium 12-hydroxy stearate thickener was prepared. Apparent viscosity, dynamic viscoelasticity and creep properties were measured, and the temperature characteristics of these rheological properties were compared to that of dielectric relaxation time. Prepared lubricating grease showed two dielectric relaxation processes. The dielectric relaxation observed in low-frequency and high-frequency regions were attributed to thickener and polyol ester base oil, respectively. The dielectric relaxation time of the high-frequency relaxation exhibited non-Arrhenius-type temperature dependence. This temperature characteristic is similar to that of viscoelastic relaxation time, shift factor obtained from superposition of creep compliance data, and viscosity of polyol ester base oil. On the other hand, the dielectric relaxation time of the low-frequency relaxation showed Arrhenius-type temperature dependence. However, no clear relation was observed between the dielectric relaxation in low-frequency region and the rheological properties measured in this study.Akihito SuzukiShinichi KotakeMasabumi MasukoYukitoshi FujinamiJapanese Society of Tribologistsarticlelubricating greasedielectric relaxationrheologybase oilthickenermolecular motionpolyol esterlithium 12-hydroxy stearatePhysicsQC1-999Engineering (General). Civil engineering (General)TA1-2040Mechanical engineering and machineryTJ1-1570ChemistryQD1-999ENTribology Online, Vol 7, Iss 3, Pp 165-170 (2012)
institution	DOAJ
collection	DOAJ
language	EN
topic	lubricating grease dielectric relaxation rheology base oil thickener molecular motion polyol ester lithium 12-hydroxy stearate Physics QC1-999 Engineering (General). Civil engineering (General) TA1-2040 Mechanical engineering and machinery TJ1-1570 Chemistry QD1-999
spellingShingle	lubricating grease dielectric relaxation rheology base oil thickener molecular motion polyol ester lithium 12-hydroxy stearate Physics QC1-999 Engineering (General). Civil engineering (General) TA1-2040 Mechanical engineering and machinery TJ1-1570 Chemistry QD1-999 Akihito Suzuki Shinichi Kotake Masabumi Masuko Yukitoshi Fujinami Relation between Dielectric Relaxation and Rheological Properties of Lubricating Greases
description	The dielectric spectroscopy method was applied to the investigation of the dynamics of base oil and thickener of lubricating grease. In order to observe the dielectric relaxations both of base oil and thickener, the lubricating grease formed from polyol ester base oil and lithium 12-hydroxy stearate thickener was prepared. Apparent viscosity, dynamic viscoelasticity and creep properties were measured, and the temperature characteristics of these rheological properties were compared to that of dielectric relaxation time. Prepared lubricating grease showed two dielectric relaxation processes. The dielectric relaxation observed in low-frequency and high-frequency regions were attributed to thickener and polyol ester base oil, respectively. The dielectric relaxation time of the high-frequency relaxation exhibited non-Arrhenius-type temperature dependence. This temperature characteristic is similar to that of viscoelastic relaxation time, shift factor obtained from superposition of creep compliance data, and viscosity of polyol ester base oil. On the other hand, the dielectric relaxation time of the low-frequency relaxation showed Arrhenius-type temperature dependence. However, no clear relation was observed between the dielectric relaxation in low-frequency region and the rheological properties measured in this study.
format	article
author	Akihito Suzuki Shinichi Kotake Masabumi Masuko Yukitoshi Fujinami
author_facet	Akihito Suzuki Shinichi Kotake Masabumi Masuko Yukitoshi Fujinami
author_sort	Akihito Suzuki
title	Relation between Dielectric Relaxation and Rheological Properties of Lubricating Greases
title_short	Relation between Dielectric Relaxation and Rheological Properties of Lubricating Greases
title_full	Relation between Dielectric Relaxation and Rheological Properties of Lubricating Greases
title_fullStr	Relation between Dielectric Relaxation and Rheological Properties of Lubricating Greases
title_full_unstemmed	Relation between Dielectric Relaxation and Rheological Properties of Lubricating Greases
title_sort	relation between dielectric relaxation and rheological properties of lubricating greases
publisher	Japanese Society of Tribologists
publishDate	2012
url	https://doaj.org/article/53e67a4c3f9f4053b41d366ff38eb49a
work_keys_str_mv	AT akihitosuzuki relationbetweendielectricrelaxationandrheologicalpropertiesoflubricatinggreases AT shinichikotake relationbetweendielectricrelaxationandrheologicalpropertiesoflubricatinggreases AT masabumimasuko relationbetweendielectricrelaxationandrheologicalpropertiesoflubricatinggreases AT yukitoshifujinami relationbetweendielectricrelaxationandrheologicalpropertiesoflubricatinggreases
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Relation between Dielectric Relaxation and Rheological Properties of Lubricating Greases

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