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RISS 인기검색어
- 검색키워드
- 저자 : Mengxiang (검색결과 6 건)
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Meng Xiang,Chengjie Li,Lin Ye 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.62 No.-
Based on the industrialized reduced graphene oxide (RGO) product, the graphene precursor of RGO-TDI with reactive sites of isocyanate groups was prepared with high grafting ratio, and a series of PA6/RGO-TDI composites were prepared via reactive melt processing. The PA6 molecules were confirmed to reactively intercalate into RGO layers through covalent and hydrogen bonding, which had high grafting ratio and layer thickness, exhibiting almost monolayer dispersion state. The molecular bridge effect of exfoliated RGO-TDI lowered activation energy of electrically conductive network formation, which resulted in a rapid increase of electrical conductivity of the composites with a low threshold percolation.
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Meng Xiang,Chengjie Li,Lin Ye 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.50 No.-
Based on the industrialized reduced graphene oxide (RGO) product, MC nylon-6/RGO composites were insitu synthesized through anchoring effect of polyetheramine (PEA). Nylon-6 chains were confirmed tointercalate into RGO layers with high grafting ratio by formation of covalent bond and intermolecularhydrogen bond. By presence of PEA, RGO was well exfoliated by the nylon-6 chains and the average layerthickness increased remarkably. Moreover, the stacking of RGO layers was much more weakened andexhibited almost monolayer homogenous dispersion state in the matrix, resulting in the establishment ofthe electrically conductive network with a low threshold percolation.
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Thermal-balanced integral model for pyrolysis and ignition of wood
Rui Xiao,Dekui Shen,Mengxiang Fang,Wanki Chow 한국화학공학회 2013 Korean Journal of Chemical Engineering Vol.30 No.1
The pyrolysis and ignition of wood is of great importance to understand the initial stage of combustion,helping control the occurrence and spread of unwanted building and forestry fires. The development of a thermal-balanced model is introduced for examining the analytical relationship between the ignition time and external heat flux. The critical heat flux, one of the important fire-retardant characteristics of combustible solid, is determined from a correlation study between the ignition time and external heat flux. One of the thermal-balanced integral models, considering the effect of surface heat losses, average absorptivity and moisture content, is employed to give the prediction of surface temperature rise, ignition time and ignition temperature of the Aspen. The results show that the model readily and satisfactorily predicts ignition temperature and ignition time of wood with different moisture contents.
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Influence of carbon fibers on interfacial bonding properties of copper-coated carbon fibers
Zhang Guodong,Yang Weizhuang,Ding Jianan,Liu Mengxiang,Di Chengrui,Ci Shengzong,Qiao Kun 한국탄소학회 2024 Carbon Letters Vol.34 No.3
Copper-coated carbon fibers have excellent conductivity and mechanical properties, making them a promising new light-weight functional material. One of the main challenges to their development is the poor affinity between carbon fiber and metals. This paper selects different carbon fibers for copper electroplating experiments to study the effect of carbon fiber properties on the interface bonding performance between the copper plating layer and carbon fibers. It has been found that the interfacial bonding performance between copper and carbon fiber is related to the degree of graphitization of carbon fiber. The lower the degree of graphitization of carbon fiber, the smaller the proportion of carbon atoms with sp2 hybrid structure in carbon fiber, the stronger the interfacial bonding ability between carbon fiber and copper coating. Therefore, carbon fiber with lower graphitization degree is conducive to reducing the falling off rate of copper coating and improving the quality of copper coating, and the conductivity of copper-plated carbon fibers increases with the decrease of graphitization degree of carbon fibers. The conductivity of copper-plated carbon fibers increases by more than six times when the graphitization degree of carbon fibers decreases by 23.9%. This work provides some benchmark importance for the preparation of high-quality copper-plated carbon fibers.
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Zhipeng Lyu,Wenguang Liu,Chao Liu,Yuhang Zhang,Mengxiang Fang 대한기계학회 2021 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.35 No.10
In this paper, the vibration and buckling behavior of a functionally graded piezoelectric porous cylindrical microshell under thermo-electro-mechanical loads are explored on the basis of modified couple stress theory and higher-order shear deformation theory. First, the model of a functionally graded piezoelectric porous cylindrical microshell composed of piezoelectric materials with gradient change in the thickness direction was described. Second, the governing equations of the microshell were derived by Hamilton's principle and Maxwell equation. Third, the modal frequency and buckling equations of the microshell with simply supported ends were obtained on the basis of harmonic trigonometric functions. Finally, the effects of parameters on the modal frequency and buckling behavior were carried out by case studies. The results show that the modal frequency of the microshell can be adjusted by changing the porosity volume fraction, power index, applied voltage, axial load and geometric dimensions. It is also found that the vibration of the microshell is suppressed by positive voltage and axial compression but is strengthened by negative voltage and axial tension, and the material length scale parameter increases stiffness. In addition, the effects of applied voltage and axial load on the buckling behavior are larger than those of temperature. Results can be used to guide the design and application of piezoelectric devices.
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Dekui Shen,Qian Liu,Rui Xiao,Huiyan Zhang,Mengxiang Fang 한국화학공학회 2013 Korean Journal of Chemical Engineering Vol.30 No.3
A mathematical model of thermal decomposition together with the flammability limit is proposed to describe the pyrolysis and spontaneous ignition of wood slab subjected to the radiation from a truncated-cone heater. The prominent physical and chemical phenomena were considered in the model, involving heat transfer in a solid, heat consumed by thermal decomposition reactions, the evaporation of moisture, re-radiation from pore surfaces inside a solid and so on. The numerical solution allows the prediction of in-depth temperature profiles, evolution of volatiles,variation of thermal conductivity, apparent mass loss (solid conversion) and ignition time. The different densities for wood species and effect of moisture content and grain orientation on thermal conductivity are also considered in the model, producing a good prediction of surface temperatures. This gives birth to the reasonable prediction on ignition time of wood by employing fixed surface temperature (400 oC) as ignition criterion. However, the analysis of constituent fractions for the species associated with the multi-components kinetic scheme should be included in the mathematical model to give a more precise prediction on the apparent mass loss of solid.
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