Novel Ni-PSF@PAO40 microcapsules(NPPMS)with high stability were prepared by using a combined processing method of electroless nickel plating and solvent volatilization.The results indicate that Ni is completely assemb...Novel Ni-PSF@PAO40 microcapsules(NPPMS)with high stability were prepared by using a combined processing method of electroless nickel plating and solvent volatilization.The results indicate that Ni is completely assembled on the surfaces of PSF/PAO40 microcapsules with the encapsulation capacity of NPPMS achieved at 50%.Organic solvents immersion shows that NPPMS have an excellent chemical stability.Macro thermal stability tests reveal that the softening temperature of NPPMS is increased up to over 400℃ while it becomes lower than 200℃ for PSF/PAO40 microcapsules.Furthermore,NPPMS were embedded into polyamide 6(PA6)to prepare PA6/NPPMS composites.The cross-sectional morphology shows that NPPMS are intact in PA6 matrices.The microhardness of PA6 is effectively improved with the incorporation of NPPMS.As compared with neat PA6,the coefficient of friction(COF)for PA6/NPPMS composites with 10%NPPMS could be reduced by 87.7%(from 0.49 to 0.06)and the wear rate could be decreased by 96.8%(from 1.29×10^(-5) to 4.15×10^(-7) mm^(3)/(N·m)).Further studies confirmed that increasing test loads and test temperatures was beneficial to improve the lubrication performance of NPPMS despite the opposite trend occurred when increasing the sliding speeds.It has been demonstrated that synergistic effects between PAO40 and Ni layer play an important role in improving the tribological properties of PA6.Therefore,NPPMS significantly improve the ability of microcapsules to resist a harsh environment,which has important scientific significance for expanding the use of microcapsules more practically in self-lubricating composites.展开更多
To expand the use of metal–organic frameworks(MOFs)based self-lubricating composite,flexible MOFs MIL-88D has been studied as a nanocontainer for loading lubricant.In this work,the mechanism of oleamine adsorption an...To expand the use of metal–organic frameworks(MOFs)based self-lubricating composite,flexible MOFs MIL-88D has been studied as a nanocontainer for loading lubricant.In this work,the mechanism of oleamine adsorption and desorption by MIL-88D was investigated through molecular simulations and experiments.Molecular simulations showed that the oleamines can be physically adsorbed into open MIL-88Ds with the Fe and O atoms of MIL-88D interacting with oleamine NH2-group.Higher temperature can cause Ole@MIL-88D to release more oleamines,while higher pressure on Ole@MIL-88D caused less oleamines released.Moreover the Ole@MIL-88D was incorporated into epoxy resin(EP)for friction tests.The optimum mass ratio of MIL-88D to EP is 15 wt%,and the EP/Ole@MIL-88D prefers light load and high frequency friction.This work suggests that flexible MOFs can be used as a nanocontainer for loading lubricant,and can be used as a new self-lubricating composite.展开更多
The goal of net zero carbon emissions is of a great concern to energy conservation and emission reduction.In aerospace and other industrial fields,one of main energy consumption forms is friction between motion pairs,...The goal of net zero carbon emissions is of a great concern to energy conservation and emission reduction.In aerospace and other industrial fields,one of main energy consumption forms is friction between motion pairs,although the energy consumption caused by equipment mass cannot be ignored.Therefore,ultra-low density self-lubricating composites with an interpenetrating polymer network(IPN)structure-liquid lubricant coupling mechanism are designed and prepared in this work to meet the pressing requirements of energy saving and emission reduction.The liquid lubricant is locked in situ into polyurethane acrylate(PUA)with IPN structures(IPN-PUA structures).The thermodynamic,mechanical,and tribological properties,as well as the comprehensive density-friction properties of the material with IPN-PUA structures were studied.After the liquid lubricant is locked into the IPN-PUA structure,the material possesses not only excellent self-lubricating properties but also good micro-mechanical properties,with a coefficient of friction(COF)of 0.0938,wear rate of 6.58×10^(−15) m^(3)/(N·m)and nanoindentation modulus of 4.5 GPa.Compared with other polymeric materials,such composite materials also possess an ultra-low density of 1.107 g/cm3,which contributes to their excellent versatile self-lubrication and low-density characteristics.展开更多
基金This work was supported by the Doctoral Fund Project of Yanshan University(No.BL18057)Aviation Scientific Fund Project(No.20200045099001)Aviation Scientific Fund Project(No.20184599001).
文摘Novel Ni-PSF@PAO40 microcapsules(NPPMS)with high stability were prepared by using a combined processing method of electroless nickel plating and solvent volatilization.The results indicate that Ni is completely assembled on the surfaces of PSF/PAO40 microcapsules with the encapsulation capacity of NPPMS achieved at 50%.Organic solvents immersion shows that NPPMS have an excellent chemical stability.Macro thermal stability tests reveal that the softening temperature of NPPMS is increased up to over 400℃ while it becomes lower than 200℃ for PSF/PAO40 microcapsules.Furthermore,NPPMS were embedded into polyamide 6(PA6)to prepare PA6/NPPMS composites.The cross-sectional morphology shows that NPPMS are intact in PA6 matrices.The microhardness of PA6 is effectively improved with the incorporation of NPPMS.As compared with neat PA6,the coefficient of friction(COF)for PA6/NPPMS composites with 10%NPPMS could be reduced by 87.7%(from 0.49 to 0.06)and the wear rate could be decreased by 96.8%(from 1.29×10^(-5) to 4.15×10^(-7) mm^(3)/(N·m)).Further studies confirmed that increasing test loads and test temperatures was beneficial to improve the lubrication performance of NPPMS despite the opposite trend occurred when increasing the sliding speeds.It has been demonstrated that synergistic effects between PAO40 and Ni layer play an important role in improving the tribological properties of PA6.Therefore,NPPMS significantly improve the ability of microcapsules to resist a harsh environment,which has important scientific significance for expanding the use of microcapsules more practically in self-lubricating composites.
基金Foundation of State Key Laboratory of Tribology in Advanced Equipment at Tsinghua University(Grant No.SKLTKF21B13)Natural Science Foundation of Hebei Province of China(Grant No.E2021203092)National Natural Science Foundation of China(Grant No.51905297)are acknowledged.
文摘To expand the use of metal–organic frameworks(MOFs)based self-lubricating composite,flexible MOFs MIL-88D has been studied as a nanocontainer for loading lubricant.In this work,the mechanism of oleamine adsorption and desorption by MIL-88D was investigated through molecular simulations and experiments.Molecular simulations showed that the oleamines can be physically adsorbed into open MIL-88Ds with the Fe and O atoms of MIL-88D interacting with oleamine NH2-group.Higher temperature can cause Ole@MIL-88D to release more oleamines,while higher pressure on Ole@MIL-88D caused less oleamines released.Moreover the Ole@MIL-88D was incorporated into epoxy resin(EP)for friction tests.The optimum mass ratio of MIL-88D to EP is 15 wt%,and the EP/Ole@MIL-88D prefers light load and high frequency friction.This work suggests that flexible MOFs can be used as a nanocontainer for loading lubricant,and can be used as a new self-lubricating composite.
基金financially supported by the Natural Science Foundation of Hebei Province of China(No.E2021203092)the Opening Foundation of State Key Laboratory of Tribology in Advanced Equipment(SKLT)at Tsinghua University(No.SKLTKF21B13)+1 种基金the National Natural Science Foundation of China(No.51905297)the Aviation Scientific Fund Project(No.20200045099001).
文摘The goal of net zero carbon emissions is of a great concern to energy conservation and emission reduction.In aerospace and other industrial fields,one of main energy consumption forms is friction between motion pairs,although the energy consumption caused by equipment mass cannot be ignored.Therefore,ultra-low density self-lubricating composites with an interpenetrating polymer network(IPN)structure-liquid lubricant coupling mechanism are designed and prepared in this work to meet the pressing requirements of energy saving and emission reduction.The liquid lubricant is locked in situ into polyurethane acrylate(PUA)with IPN structures(IPN-PUA structures).The thermodynamic,mechanical,and tribological properties,as well as the comprehensive density-friction properties of the material with IPN-PUA structures were studied.After the liquid lubricant is locked into the IPN-PUA structure,the material possesses not only excellent self-lubricating properties but also good micro-mechanical properties,with a coefficient of friction(COF)of 0.0938,wear rate of 6.58×10^(−15) m^(3)/(N·m)and nanoindentation modulus of 4.5 GPa.Compared with other polymeric materials,such composite materials also possess an ultra-low density of 1.107 g/cm3,which contributes to their excellent versatile self-lubrication and low-density characteristics.
