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Thermochemical Stability and Friction Properties of Soft Organosilica Networks for Solid Lubrication

In view of their possible application as high temperature solid lubricants, the tribological and thermochemical properties of several organosilica networks were investigated over a range of temperatures between 25 and 580 °C. Organosilica networks, obtained from monomers with terminal and bridging o...

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Autores principales: Gonzalez Rodriguez, Pablo, Dral, A. Petra, van den Nieuwenhuijzen, Karin J. H., Lette, Walter, Schipper, Dik J., ten Elshof, Johan E.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5848877/
https://www.ncbi.nlm.nih.gov/pubmed/29364164
http://dx.doi.org/10.3390/ma11020180
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author Gonzalez Rodriguez, Pablo
Dral, A. Petra
van den Nieuwenhuijzen, Karin J. H.
Lette, Walter
Schipper, Dik J.
ten Elshof, Johan E.
author_facet Gonzalez Rodriguez, Pablo
Dral, A. Petra
van den Nieuwenhuijzen, Karin J. H.
Lette, Walter
Schipper, Dik J.
ten Elshof, Johan E.
author_sort Gonzalez Rodriguez, Pablo
collection PubMed
description In view of their possible application as high temperature solid lubricants, the tribological and thermochemical properties of several organosilica networks were investigated over a range of temperatures between 25 and 580 °C. Organosilica networks, obtained from monomers with terminal and bridging organic groups, were synthesized by a sol-gel process. The influence of carbon content, crosslink density, rotational freedom of incorporated hydrocarbon groups, and network connectivity on the high temperature friction properties of the polymer was studied for condensed materials from silicon alkoxide precursors with terminating organic groups, i.e., methyltrimethoxysilane, propyltrimethoxysilane, diisopropyldimethoxysilane, cyclohexyltrimethoxysilane, phenyltrimethoxysilane and 4-biphenylyltriethoxysilane networks, as well as precursors with organic bridging groups between Si centers, i.e., 1,4-bis(triethoxysilyl)benzene and 4,4′-bis(triethoxysilyl)-1,1′-biphenyl. Pin-on-disc measurements were performed using all selected solid lubricants. It was found that materials obtained from phenyltrimethoxysilane and cyclohexyltrimethoxysilane precursors showed softening above 120 °C and performed best in terms of friction reduction, reaching friction coefficients as low as 0.01. This value is lower than that of graphite films (0.050 ± 0.005), a common bench mark for solid lubricants.
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spelling pubmed-58488772018-03-14 Thermochemical Stability and Friction Properties of Soft Organosilica Networks for Solid Lubrication Gonzalez Rodriguez, Pablo Dral, A. Petra van den Nieuwenhuijzen, Karin J. H. Lette, Walter Schipper, Dik J. ten Elshof, Johan E. Materials (Basel) Article In view of their possible application as high temperature solid lubricants, the tribological and thermochemical properties of several organosilica networks were investigated over a range of temperatures between 25 and 580 °C. Organosilica networks, obtained from monomers with terminal and bridging organic groups, were synthesized by a sol-gel process. The influence of carbon content, crosslink density, rotational freedom of incorporated hydrocarbon groups, and network connectivity on the high temperature friction properties of the polymer was studied for condensed materials from silicon alkoxide precursors with terminating organic groups, i.e., methyltrimethoxysilane, propyltrimethoxysilane, diisopropyldimethoxysilane, cyclohexyltrimethoxysilane, phenyltrimethoxysilane and 4-biphenylyltriethoxysilane networks, as well as precursors with organic bridging groups between Si centers, i.e., 1,4-bis(triethoxysilyl)benzene and 4,4′-bis(triethoxysilyl)-1,1′-biphenyl. Pin-on-disc measurements were performed using all selected solid lubricants. It was found that materials obtained from phenyltrimethoxysilane and cyclohexyltrimethoxysilane precursors showed softening above 120 °C and performed best in terms of friction reduction, reaching friction coefficients as low as 0.01. This value is lower than that of graphite films (0.050 ± 0.005), a common bench mark for solid lubricants. MDPI 2018-01-24 /pmc/articles/PMC5848877/ /pubmed/29364164 http://dx.doi.org/10.3390/ma11020180 Text en © 2018 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Gonzalez Rodriguez, Pablo
Dral, A. Petra
van den Nieuwenhuijzen, Karin J. H.
Lette, Walter
Schipper, Dik J.
ten Elshof, Johan E.
Thermochemical Stability and Friction Properties of Soft Organosilica Networks for Solid Lubrication
title Thermochemical Stability and Friction Properties of Soft Organosilica Networks for Solid Lubrication
title_full Thermochemical Stability and Friction Properties of Soft Organosilica Networks for Solid Lubrication
title_fullStr Thermochemical Stability and Friction Properties of Soft Organosilica Networks for Solid Lubrication
title_full_unstemmed Thermochemical Stability and Friction Properties of Soft Organosilica Networks for Solid Lubrication
title_short Thermochemical Stability and Friction Properties of Soft Organosilica Networks for Solid Lubrication
title_sort thermochemical stability and friction properties of soft organosilica networks for solid lubrication
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5848877/
https://www.ncbi.nlm.nih.gov/pubmed/29364164
http://dx.doi.org/10.3390/ma11020180
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