JOURNAL OF APPLIED POLYMER SCIENCE
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2020
·Vol. 137
·期 31
·48936
·
IF 2.52
Chang Li,Yalong Hu,Jiazhi Zhang,Liming Shen,Ningzhong Bao
A series of sodium iron titanate (NFTO)–fluorocarbon composite coatings have been prepared with the liquid-phase blending method. The effects of two types of NFTO, NFTO platelets, and NFTO whiskers, on the tribological and corrosion behaviors of the composite coatings, are systematically studied. The results show that the addition of NFTO can significantly enhance the friction-reducing and wear resistance performances of the fluorocarbon coating. Under dry sliding, the minimum specific wear rate is 1.67 × 10 −4 mm 3 /Nm for the platelet-filled composite coatings and 1.15 × 10 −4 mm 3 /Nm for the whisker-filled composite coatings, respectively, showing a decrease of 83.5 and 88.6% than that of pure coating. Under a simulated seawater environment, the minimum specific wear rate is 5.44 × 10 −5 mm 3 /Nm for the platelet-filled composite coatings and 0.84 × 10 −5 mm 3 /Nm for the whisker-filled composite coatings, respectively, showing a decrease of 90.5 and 98.5% than that of pure coating. The morphologies of worn surfaces, wear debris, and transfer films are analyzed, and the corresponding wear resistance mechanisms are discussed. The electrochemical impedance spectroscopy certifies a remarkably improved corrosion resistance of the composite coatings which have been immersed in 3.5 wt % NaCl solution for 30 days. The composite coating reinforced with 7.5 wt % platelets shows the highest resistance of 256.3 × 10 6 Ω·cm 2 , approximately two orders of magnitude higher than that of pure coating. © 2020 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020 , 137 , 48936.
研究领域:
材料科学
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表面工程
·
腐蚀与防护
✓ 已验证
产品关联
DOI
高影响因子
NANOTECHNOLOGY
·
2020
·Vol. 32
·期 12
·125703
·
IF 3.551
Penghao Zhang,Cheng Zhang,Chuansheng Zhang,Fei Kong,Ping Yan,Tao Shao
Polystyrene (PS) is a common insulating material in pulsed power devices, which has excellent and reliable insulation properties. However, the charge accumulation on the insulator surface seriously threatens its surface insulation property. Surface modification has been verified as an effective way for inhibiting surface charge accumulation. In this paper, plasma polymerized fluorocarbon (PPFC) coating was prepared by low-temperature plasma polymerization in the mixture of methyl-methacrylate and dodecafluoroheptyl-methacrylate (DFHMA). Compared with the untreated PS, the surface charge dissipation rate of PPFC coating is increased by more than 6 times. The introduction of DFHMA makes the coating have no obvious ageing effect after the storage, and has good reusability after the surface flashover. This work provides a new method for modification of polymer dielectrics and a novel way for the preparation of high-charge-dissipation polymers in other related fields.
研究领域:
材料科学
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电气工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Coatings
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2019
·Vol. 9
·期 10
·683
·
IF 2.33
Jiazhi Zhang,Chang Li,Kelan Yan,Liming Shen,Ningzhong Bao
Inorganic–organic composite coatings with fluoroethylene vinyl ether (FEVE) resin as polymer matrix and sodium iron titanate (NFTO) whiskers with different aspect ratios as reinforcement filler are prepared by the liquid-phase blending method. The influence of aspect ratio and content of NFTO whiskers on the morphology, and the mechanical and tribological performances, of NFTO-reinforced FEVE composite coatings are investigated. The addition of NFTO whiskers can obviously enhance the mechanical and wear resistance performances of the composite coatings and reduce the friction coefficient. The worn surface and wear debris of the composite coatings are studied with scanning electron microscopy (SEM) to reveal the friction-reducing and wear resistance mechanisms. The composite coating filled with ~10 wt.% NFTO whiskers has the best wear resistance performance, since the monodispersed hard whisker can carry the load applied on the sliding surface and reduce the adhesive wear of the polymer matrix. Among the three types of NFTO whiskers, the whiskers with a medium aspect ratio show the best reinforcement effect since they provide the optimum mechanical support to the polymer matrix and cannot be pulled out from the matrix easily.Keywords:fluorocarbon coating;sodium iron titanate whisker;surface modification;mechanical performances;tribological behaviors
研究领域:
材料科学
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表面工程
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复合材料
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2015
·
IF 2.711
Baozhong Lin,Shuxue Zhou
Novel functional silica nanoparticles (SiO 2 -NBS-F) with irreversible light-responsive wettability were prepared by grafting of a light-responsive silane coupling agent (NBS) and further bonding with hydrophobic segments via a click reaction. The NBS was synthesized using an o -nitrobenzyl alcohol derivative of the photolabile protecting group. The SiO 2 -NBS-F nanoparticles exhibited considerable change of wettability from near-superhydrophobicity to near-superhydrophilicity after UV irradiation. The changing mechanism of wettability was confirmed by UV–Vis absorption spectra and X-ray photoelectron spectra. The SiO 2 -NBS-F nanoparticles were incorporated into fluorocarbon FEVE coatings by simple mixing. The nanoparticles occurred at the surface of the dried coatings even though their content was as low as 5 wt%, being due to their low surface free energy. The wettability of the SiO 2 -NBS-F filled FEVE coatings could transform from hydrophobicity (WCA 106.4°) to hydrophilicity (WCA 33.3°) after UV irradiation. It demonstrates that SiO 2 -NBS-F nanoparticles are useful to acquire highly hydrophilic surface for organic coatings.
研究领域:
材料科学
·
化学工程
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产品关联
DOI
高影响因子
RARE METALS
·
2024
·Vol. 44
·期 3
·1577-1593
·
IF 9.6
Sun Gao-Xing,Zhu Bin,He Rui,Liang Qi-Dong,Jiang Sheng-Yu,Ren Yan,Pan Xiao-Xiao,Sun Yu-Qing,Lu Mi,Zhang Wen-Xian,Huang Cheng-Huan,Zhuang Shu-Xin
Although lithium-ion batteries are widely recognized as a new generation of energy storage devices, their large-scale application is severely hampered by their low energy density and restricted cyclic stability. Herein, an ingenious dual-modified interface, where the F-doping and fluorocarbon coating co-existed on Li[Ni 0.8 Co 0.1 Mn 0.1 ]O 2 surface, is rationally constructed to elevate its energy density and structural stability attributed to F − grafting between the bulk material and the coating utilizing a robust super-conformal fluorocarbon coating structural framework and more stable F-doped system under high charge/discharge cut-off voltage. In comparison with a single carbon-coated modified Li[Ni 0.8 Co 0.1 Mn 0.1 ]O 2 , the dual-modified sample overcomes the fatal disadvantage of carbon coating stripping during long-period cycles ascribed to the “TM-F-multifunctional coating” connector which firmly combines the bulk material with the coating with a strong interaction force, exhibiting a more stable-reversible structure and excellent comprehensive electrochemical performance under high cut-off voltage. Concomitantly, the F-transition metal bonds with stronger bond energies improve its structural reversibility during the processes of charge/discharge under high voltage. Furthermore, the fluorocarbon coating enhances its charge transfer ability and effectively restrains the interfacial side reactions. Additionally, the climbing nudged elastic band methodology is used to calculate the diffusion energy barrier of lithium-ions in the matrix material, which confirms the fundamental reason for its superior lithium-ion diffusion ability. The high pseudocapacitance contribution ratio is perfectly explained by calculating the adsorption capacity on the surface of the dual-modified sample. Consequently, experiments and theoretical calculations unequivocally confirm its distinguished electrochemical properties under high cut-off voltage. Graphical
研究领域:
材料科学
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电化学
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能源存储
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锂离子电池
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表面工程
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固态化学
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纳米材料
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）