The graphene-based semi-solid grease with low friction coefficient was prepared by highly dispersed mixing method. The friction testing result showed that the friction coefficient of the graphene oxidebased semi-solid...The graphene-based semi-solid grease with low friction coefficient was prepared by highly dispersed mixing method. The friction testing result showed that the friction coefficient of the graphene oxidebased semi-solid grease reduced from ca. 0.105 of graphite-based one to ca. 0.075, approximately 30% decreasing. Further, the graphene-based semi-solid grease shows the more outstandingly lubricating property, and the friction coefficient approximately drops to the range of between 0.04 and 0.06. By comparing with the graphite-based grease, the friction coefficient decreases about 40%-60% and the wear reduced over 50%.展开更多
Polyvinyl butyral（PVB） polymer was successfully synthesized using ionic liquid（IL） catalyst. The synthesis of PVB was achieved by acetalization of polyvinyl alcohol（PVA） and butyraldehyde（BA） in the presence o...Polyvinyl butyral（PVB） polymer was successfully synthesized using ionic liquid（IL） catalyst. The synthesis of PVB was achieved by acetalization of polyvinyl alcohol（PVA） and butyraldehyde（BA） in the presence of [HMIM]~＋HSO_4^-IL catalyst. The FT-IR,~1H NMR, DSC, GPC and SEM characterizations were used to analyze the structure and properties of PVB. The effects of the concentration of PVA in water and the number of reuse cycles on the acetalization degree were investigated. The results indicated that the maximum acetalization degree of PVB obtained using [HMIM]~＋HSO_4^-IL catalyst was up to 72%. The comparison of the commercial PVB and the PVB obtained using [HMIM]~＋HSO_4^-IL catalyst showed that the self-made PVB has a larger molecular weight, higher viscosity, and higher acetalization degree than the commercial PVB.展开更多
基金supported by the talent introduction fund of Yangzhou University
文摘The graphene-based semi-solid grease with low friction coefficient was prepared by highly dispersed mixing method. The friction testing result showed that the friction coefficient of the graphene oxidebased semi-solid grease reduced from ca. 0.105 of graphite-based one to ca. 0.075, approximately 30% decreasing. Further, the graphene-based semi-solid grease shows the more outstandingly lubricating property, and the friction coefficient approximately drops to the range of between 0.04 and 0.06. By comparing with the graphite-based grease, the friction coefficient decreases about 40%-60% and the wear reduced over 50%.
基金supported by the Talent Introduction Fund of Yangzhou University, Jiangsu Social Development Project(No. BE2014613)Six Talent Peaks of Jiangsu Province (No. 2014-XCL-013)the Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions
文摘Polyvinyl butyral（PVB） polymer was successfully synthesized using ionic liquid（IL） catalyst. The synthesis of PVB was achieved by acetalization of polyvinyl alcohol（PVA） and butyraldehyde（BA） in the presence of [HMIM]~＋HSO_4^-IL catalyst. The FT-IR,~1H NMR, DSC, GPC and SEM characterizations were used to analyze the structure and properties of PVB. The effects of the concentration of PVA in water and the number of reuse cycles on the acetalization degree were investigated. The results indicated that the maximum acetalization degree of PVB obtained using [HMIM]~＋HSO_4^-IL catalyst was up to 72%. The comparison of the commercial PVB and the PVB obtained using [HMIM]~＋HSO_4^-IL catalyst showed that the self-made PVB has a larger molecular weight, higher viscosity, and higher acetalization degree than the commercial PVB.
