Proton irradiation effects on the structural and tribological properties of polytetrafluoroethylene

Liu, Baixing; Liang, Jun; Zhen-jun, Peng; Wang, Xiang-Li

doi:10.1007/s10118-016-1862-9

Cited by 4 publications

(3 citation statements)

References 29 publications

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“…However, the Si 2p peaks for the coatings exposed to AO shifted to higher binding energies from 102.4 to 103.3 eV compared to unexposed coatings, indicating the oxidation of silicon from Si 2 O 3 to SiO 2. These changes are consistent with the observations from SEM, FTIR, and XRD and confirm that the incorporation of OvPOSS improves the AO resistance of the PMB/PTFE composite coatings.…”

Section: Resultssupporting

confidence: 89%

Tribological properties of the polyacrylate/PTFE coating modified by POSS in the space environment

Wan

et al. 2019

J of Applied Polymer Sci

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The irradiation conditions in the low earth orbit (LEO) severely inhibit the development of polymeric materials for solid lubrication coatings used on the external surfaces of spacecraft. To solve the problem, octavinyl polyhedral oligomeric silsesquioxanes (OvPOSS) were covalently grafted onto poly(methyl/butyl methacrylate) composites (PMB). The results showed that the appropriate incorporation of OvPOSS (10 wt %) significantly reduced the friction coefficient and improved the wear resistance of the OvPOSS/PMB composite coatings. Furthermore, the impact of OvPOSS on the tribological properties of PMB/polytetrafluoroethylene (PTFE) lubrication coatings in the space environment was investigated. In particular, the degradations, mass losses, surface morphologies, and chemical compositions of POSS/PMB/PTEF composite coatings were characterized under ultraviolet (UV), electric irradiation (EI), and atomic oxygen (AO). The results indicated that OvPOSS provides numerous SiOSi bonds in the polymer matrix that improve the resistance to UV and EI. Besides, a passivating SiO2 layer was formed to prevent further erosion and degradation of the underlying PMB and PTFE components during AO irradiation. Particularly, the wear resistance of OvPOSS/PMB/PTFE coatings under AO irradiation increased significantly compared with the pristine PMB/PTFE coating. Overall, our results indicate that POSS‐containing composites are a good prospective material for space application in the LEO. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020, 137, 48730.

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Section: Resultssupporting

confidence: 89%

Tribological properties of the polyacrylate/PTFE coating modified by POSS in the space environment

Wan

et al. 2019

J of Applied Polymer Sci

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“…Specifically, PTFE exhibits a non‐adhesive property with respect to other materials owing to its low surface energy and chemical inertness. It includes a chain of molecules in a spiral shape with a carbon chain in the middle that is surrounded by fluorine atoms that form a compact protective layer on the surface of the PTFE molecule.…”

Section: Theorymentioning

confidence: 99%

Trimethyl borate‐treated polytetrafluoroethylene micropowders with improved hydrophilic and adhesive properties based on coordination bond theory

Long

Zhang

et al. 2018

Surface & Interface Analysis

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Based on coordination bond theory, the current study proposes a novel method to modify the surface of the polytetrafluoroethylene (PTFE) micropowders. The samples were treated with trimethyl borate in the n‐hexane solution, and this improves the hydrophilic and adhesive properties of PTFE micropowders. The surface properties of treated samples were evaluated by using X‐ray photoelectron spectrometry, contact angle measurement, settling velocity measurement, and adhesive property measurement. Trimethyl borate treatment led to an evident increase in the hydrophilic and adhesive properties of PTFE micropowders. The water contact angle of PTFE micropowders decreased from 115° to 85.4°, while the ethanol contact angle of PTFE micropowders decreased from 39.8° to 11.2° owing to the combination of the trimethyl borate with PTFE micropowders as indicated by the X‐ray photoelectron spectrometry spectra. Furthermore, the settling velocity of powders dispersed in ethanol/water (1/10) solution (pH = 8.5) improved (with a settlement ratio exceeding 20% in 60 minutes), and the fracture stress of the powders/resin composite membrane increased from 4.68 to 6.67 MPa while the elongation at the yield of membrane increased from 25.4% to 31.5%.

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“…In some areas of application, e.g., in the nuclear industry or space research, the radiation resistance of PEEK is of major importance [ 5 ]. The irradiation causes degradation of polymeric chains, breakage of chemical bonds, generation of free radicals and release of gas degradation products [ 6 , 7 , 8 ]. Subsequent chemical reactions of transient highly reactive species lead to excessive double bonds [ 9 ], low-mass stable degradation products, large cross-linked structures and oxidized structures [ 10 ].…”

Section: Introductionmentioning

confidence: 99%

Study on the Microstructure of Polyether Ether Ketone Films Irradiated with 170 keV Protons by Grazing Incidence Small Angle X-ray Scattering (GISAXS) Technology

Yang

Tian

et al. 2020

Polymers

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Polyether ether ketone (PEEK) films irradiated with 170 keV protons were calculated by the stopping and ranges of ions in matter (SRIM) software. The results showed that the damage caused by 170 keV protons was only several microns of the PEEK surface, and the ionization absorbed dose and displacement absorbed dose were calculated. The surface morphology and roughness of PEEK after proton irradiation were studied by atomic force microscope (AFM). GISAXS was used to analyze the surface structural information of the pristine and irradiated PEEK. The experimental results showed that near the surface of the pristine and irradiated PEEK exists a peak, and the peak gradually disappeared with the increasing of the angles of incidence and the peak changed after irradiation, which implies the 170 keV protons have an effect on PEEK structure. The influences of PEEK irradiated with protons on the melting temperature and crystallization temperature was investigated by differential scanning calorimetry (DSC). The DSC results showed that the crystallinity of the polymer after irradiation decreased. The structure and content of free radicals of pristine and irradiated PEEK were studied by Fourier transform infrared spectroscopy (FTIR) and electron paramagnetic resonance (EPR). The stress and strain test results showed that the yield strength of the PEEK irradiated with 5 × 1015 p/cm2 and 1 × 1016 p/cm2 was higher than the pristine, but the elongation at break of the PEEK irradiated with 5 × 1015 p/cm2 and 1 × 1016 p/cm2 decreased obviously.

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Proton irradiation effects on the structural and tribological properties of polytetrafluoroethylene

Cited by 4 publications

References 29 publications

Tribological properties of the polyacrylate/PTFE coating modified by POSS in the space environment

Tribological properties of the polyacrylate/PTFE coating modified by POSS in the space environment

Trimethyl borate‐treated polytetrafluoroethylene micropowders with improved hydrophilic and adhesive properties based on coordination bond theory

Study on the Microstructure of Polyether Ether Ketone Films Irradiated with 170 keV Protons by Grazing Incidence Small Angle X-ray Scattering (GISAXS) Technology

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