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Chen W.,Wuhan Research Institute of Materials Protection | Chen W.,Hubei Key Laboratory of Materials Surface Protection Technology | Duan H.-T.,Wuhan Research Institute of Materials Protection | Duan H.-T.,Hubei Key Laboratory of Materials Surface Protection Technology | And 6 more authors.
Journal of Physical Chemistry B | Year: 2014

The oxidation mechanism of ultra-high-molecular-weight polyethylene (UHMWPE) and polyoxymethylene (POM) in hydrogen peroxide solution was investigated by molecular dynamics (MD) simulations via reactive force field (ReaxFF) method. MD results from ReaxFF suggested that UHMWPE provided better antioxidation activity at high temperature (>373 K) than its POM counterpart in the same concentration of hydrogen peroxide solution. Furthermore, POM was relatively more susceptible to erosion and swelling because of the infiltration of H2O2 solution. Calculations of the diffusion coefficient at different temperatures permit further understanding of the chemical phenomena involved in the level of oxidation in the course of MD simulations. Results of the simulations are generally consistent with the previous experimental available in literature. The simulations also provide new insights into understanding the mechanism resulting oxidation products among the interested polymers. © 2014 American Chemical Society. Source


Chen W.,Wuhan Research Institute of Materials Protection | Chen W.,Hubei Key Laboratory of Materials Surface Protection Technology | Duan H.,Wuhan Research Institute of Materials Protection | Duan H.,Hubei Key Laboratory of Materials Surface Protection Technology | And 7 more authors.
Gaofenzi Cailiao Kexue Yu Gongcheng/Polymeric Materials Science and Engineering | Year: 2015

In this work, pristine multi wall carbon nanotubes (MWNTs) were incorporated into ultra high molecular weight polyethylene (UHMWPE) at different concentrations. The bulk samples of the MWNTs/UHMWPE composites were prepared by the thermo-compression method. The intermolecular adhesive capacity between MWNTs and UHMWPE was deeply studied by the molecular dynamics simulation, and the reinforced effect of MWNTs on tribological properties of UHMWPE was predicted by the calculation of binding energy. Subsequently the tribological properties of MWNTs/UHMWPE composites were systematically studied by wear test. The results show that the MWNTs were effective filler for preparation of UHMWPE/MWNTs composite. With the increasing of mass fraction of MWNTs, the Shore scleroscope hardness of MWNTs/UHMWPE composites is marginally increased but the variation trend of friction coefficient is not significant. The MWNTs/UHMWPE composite with 0.3% of MWNTs exhibit smaller friction coefficient and excellent wear resistance. ©, 2015, Chengdu University of Science and Technology. All right reserved. Source


Zeng J.,Wuhan Research Institute of Materials Protection | Zeng J.,Hubei Key Laboratory of Materials Surface Protection Technology | Zheng P.,Wuhan Research Institute of Materials Protection | Zheng P.,Hubei Key Laboratory of Materials Surface Protection Technology | And 7 more authors.
Corrosion Science and Protection Technology | Year: 2016

The failure process of two composite coatings: epoxy-antirust primer/ epoxy-MIO (micaceous iron oxide)/acrylic polyurethane (P1) and epoxy-antirust primer/ chlorinated rubber (P2) in 3.5%(mass fraction) NaCl solution at 60 ℃ was investigated by electrochemical impedance spectroscopy. The variation of EIS Bode plot, electrical resistance, high-frequency capacitors and characteristic frequency of the coatings was monitored and analyzed. Results showed that: in the early immersion period, low-frequency impedance and coating resistance decreased rapidly, but they declined slowly in the later immersion period and fluctuated in a small range in the mid-term. In addition, high-frequency capacitance and characteristic frequency increased slowly in the early immersion period and increased rapidly in the later immersion period, in the mid-term, they also fluctuated in a small range. © 2016, Chinese Academy of Sciences. All rights reserved. Source

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