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DC Field | Value | Language |
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dc.citation.endPage | 172 | - |
dc.citation.number | 4 | - |
dc.citation.startPage | 161 | - |
dc.citation.title | TRIBOLOGY LETTERS | - |
dc.citation.volume | 7 | - |
dc.contributor.author | Ruths, M | - |
dc.contributor.author | Granick, S | - |
dc.date.accessioned | 2023-12-22T12:09:31Z | - |
dc.date.available | 2023-12-22T12:09:31Z | - |
dc.date.created | 2020-08-05 | - |
dc.date.issued | 1999-11 | - |
dc.description.abstract | The dynamic shear properties of molecularly-thin films of unfunctionalized and end-functionalized (telechelic) Fomblin-Z perfluoropolyalkylether (PFPAE) melts with number-average molecular weight M-n approximate to 3000-4000 g mol(-1) have been studied at shear rates of 10(-2)-10(5) s(-1) at normal pressures of 1 and 3 MPa. The shear responses are compared to measurements on end-functionalized polymers of the same chemical composition but lower molecular weight, M-n approximate to 2000 g mol(-1). The predominantly elastic response and high shear moduli of the confined film of unfunctionalized polymer, Fomblin Z03, suggest that it forms a structure likely to solidify already at low pressure. Its lubricating properties are less favorable than the ones found for hydroxyl- (DOL) and piperonyl-terminated Fomblin-Z (AM2001, AM3001), where associated molecules form a structure less prone to solidification under confinement. The thickness of the compressed films of the end-functionalized polymers increased more strongly with molecular weight than as M-n(0.5). The shear moduli were found to be larger, the higher the molecular weight, indicating slower relaxations. At a normal pressure of 3 MPa, these films solidified and displayed stick-slip as seen already at 1 MPa in the Z03 film. The limiting shear stress of the unfunctionalized Z03, sigma > 3 MPa, exceeded by an order of magnitude the limiting shear stress of all of the end-functionalized polymers. The limiting shear stress of the hydroxyl-terminated polymer was larger than that of the piperonyl-terminated polymer. | - |
dc.identifier.bibliographicCitation | TRIBOLOGY LETTERS, v.7, no.4, pp.161 - 172 | - |
dc.identifier.doi | 10.1023/A:1019137824102 | - |
dc.identifier.issn | 1023-8883 | - |
dc.identifier.scopusid | 2-s2.0-0001102801 | - |
dc.identifier.uri | https://scholarworks.unist.ac.kr/handle/201301/47402 | - |
dc.identifier.url | https://link.springer.com/article/10.1023%2FA%3A1019137824102 | - |
dc.identifier.wosid | 000084935700001 | - |
dc.language | 영어 | - |
dc.publisher | BALTZER SCI PUBL BV | - |
dc.title | Tribology of confined Fomblin-Z perfluoropolyalkylethers: molecular weight dependence and comparison between unfunctionalized and telechelic chains | - |
dc.type | Article | - |
dc.description.isOpenAccess | FALSE | - |
dc.relation.journalWebOfScienceCategory | Engineering, Chemical; Engineering, Mechanical | - |
dc.relation.journalResearchArea | Engineering | - |
dc.type.docType | Article | - |
dc.description.journalRegisteredClass | scie | - |
dc.description.journalRegisteredClass | scopus | - |
dc.subject.keywordAuthor | rheological properties | - |
dc.subject.keywordAuthor | molecular weight dependence | - |
dc.subject.keywordAuthor | unfunctionalized Fomblin-Z | - |
dc.subject.keywordAuthor | end-functionalized Fomblin-Z | - |
dc.subject.keywordPlus | STRONGLY ADSORBING SURFACES | - |
dc.subject.keywordPlus | ULTRATHIN LIQUID-FILMS | - |
dc.subject.keywordPlus | POLYMER MELTS | - |
dc.subject.keywordPlus | THIN-FILM | - |
dc.subject.keywordPlus | PERFLUOROPOLYETHER LUBRICANTS | - |
dc.subject.keywordPlus | SHEAR RESPONSE | - |
dc.subject.keywordPlus | AMORPHOUS-CARBON | - |
dc.subject.keywordPlus | ADSORPTION LIMIT | - |
dc.subject.keywordPlus | RHEOLOGY | - |
dc.subject.keywordPlus | DISKS | - |
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