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Research Article | Open Access

Fabrication of high-stability Ni-PSF@PAO40 microcapsules and their lubricating properties in polyamide 6

Wenli ZHANG1,2, Xiaowen QI1,3( ), Xiao YANG1,2, Yu DONG4, Bingli FAN1,3( ), Lei LIANG5
School of Mechanical Engineering, Yanshan University, Qinhuangdao 066004, China
Key Laboratory of Self-Lubricating Spherical Plain Bearing technology of Hebei Province, Yanshan University, Qinhuangdao 066004, China
Aviation Key Laboratory of Science and Technology on Generic Technology of Self-Lubricating Spherical Plain Bearing, Yanshan University, Qinhuangdao 066004, China
School of Civil and Mechanical Engineering, Curtin University, Perth, WA 6845, Australia
Shanghai Research Institute of Synthetic Resins Co., Ltd., Shanghai 201702, China
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Abstract

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 °C while it becomes lower than 200 °C 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 mm3/(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.

Keywords

microcapsuleselectroless nickelhigh temperature resistantpolyamide 6 (PA6)friction and wear

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Friction
Volume 10 Issue 12,
December 2022
Pages 1985-1999
DOI: 10.1007/s40544-021-0560-y
Cite this article:
ZHANG W, QI X, YANG X, et al. Fabrication of high-stability Ni-PSF@PAO40 microcapsules and their lubricating properties in polyamide 6. Friction, 2022, 10(12): 1985-1999. https://doi.org/10.1007/s40544-021-0560-y

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Received: 24 July 2021
Revised: 30 August 2021
Accepted: 30 September 2021
Published: 12 April 2022
© The author(s) 2021.

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