{"title":"Enhancement of polyurea grease performance through graphene oxide-functionalized polyurea thickeners: A novel hydrogen-bond network approach","authors":"","doi":"10.1016/j.triboint.2024.110123","DOIUrl":null,"url":null,"abstract":"<div><p>In conventional grease formulations, thickeners and additives are added as distinct components. This study introduces a method that integrates graphene oxide (GO) functionalized polyurea thickeners, creating a unified structure of polyurea and GO. The impact of GO functionalized polyurea on the rheological and lubrication performance of polyurea grease was investigated. Results showed that the polyurea modifies GO by covalent bonds and forms a hydrogen bond network. The GO modified polyurea reduced the yield stress and improved the flowability of the polyurea grease. The GO modified polyurea enhanced the tribological performance of polyurea grease because of the collaboration effect of tribo-chemical film and graphene boundary film. This study emerges as a viable strategy to improve the performance of polyurea grease.</p></div>","PeriodicalId":23238,"journal":{"name":"Tribology International","volume":null,"pages":null},"PeriodicalIF":6.1000,"publicationDate":"2024-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Tribology International","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0301679X24008752","RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENGINEERING, MECHANICAL","Score":null,"Total":0}
引用次数: 0
Abstract
In conventional grease formulations, thickeners and additives are added as distinct components. This study introduces a method that integrates graphene oxide (GO) functionalized polyurea thickeners, creating a unified structure of polyurea and GO. The impact of GO functionalized polyurea on the rheological and lubrication performance of polyurea grease was investigated. Results showed that the polyurea modifies GO by covalent bonds and forms a hydrogen bond network. The GO modified polyurea reduced the yield stress and improved the flowability of the polyurea grease. The GO modified polyurea enhanced the tribological performance of polyurea grease because of the collaboration effect of tribo-chemical film and graphene boundary film. This study emerges as a viable strategy to improve the performance of polyurea grease.
在传统的润滑脂配方中，增稠剂和添加剂是作为不同的组分添加的。本研究介绍了一种整合氧化石墨烯（GO）功能化聚脲增稠剂的方法，从而形成聚脲和 GO 的统一结构。研究了 GO 功能化聚脲对聚脲润滑脂流变和润滑性能的影响。结果表明，聚脲通过共价键修饰了 GO，并形成了氢键网络。GO 改性聚脲降低了聚脲润滑脂的屈服应力，改善了其流动性。由于三化学膜和石墨烯边界膜的协同作用，GO 改性聚脲提高了聚脲润滑脂的摩擦学性能。这项研究是提高聚脲润滑脂性能的可行策略。
期刊介绍：
Tribology is the science of rubbing surfaces and contributes to every facet of our everyday life, from live cell friction to engine lubrication and seismology. As such tribology is truly multidisciplinary and this extraordinary breadth of scientific interest is reflected in the scope of Tribology International.
Tribology International seeks to publish original research papers of the highest scientific quality to provide an archival resource for scientists from all backgrounds. Written contributions are invited reporting experimental and modelling studies both in established areas of tribology and emerging fields. Scientific topics include the physics or chemistry of tribo-surfaces, bio-tribology, surface engineering and materials, contact mechanics, nano-tribology, lubricants and hydrodynamic lubrication.
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