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| 1 | Synthesis and Properties of Novel Epoxidized Soybean Oil-modified Phenolic Resin /Montmorillonite Nanocomposites显示文摘The novel epoxidized soybean oil-modified-phenolic resin/clay nanocomposites(ESO-M-PR/CN) was prepared. The coupling agent-benzyldimethylphenylammonium chloride [C6H5CH2N+(CH3)2C6H5Cl-,B2MP] was adopted to modify the interface between the organic and inorganic phases. The effect of the nanocomposite structure on its physical and chemical properties was discussed. During the synthesizing process of ESO-M-PR/CN, the phenol hydroxyl was etherified by ESO or ESO epoxy resin prepolymer to provide long ESO epoxy segments. Long ESO epoxy resin chain segments enhanced the crosslink density of ESO-M-PR/CN. The thermal and mechanical properties exhibit a significant improvement. The temperature at which a weight loss of 5% occurs increases from 287.1 ℃ to 402.3 ℃. The flexural strength increases by 25%, while the flexural modulus increases by 39%. Moreover, the properties of resin were enhanced by the effect of the inorganic nanoparticles, while the size of the nanomontmorillonites in the phenolic resin was characterized with a scanning electron microscope. The particle size of inorganic montmorillonites in the modifi ed system is less than 100 nm. | HU Jianfeng SITU Yue XU Li HUANG Hong FU Heqing ZENG Hanwei CHEN Huanqin | 2008 | Journal of Wuhan University of Technology(Materials Science)2008，23，4： | 1 |
| 2 | Insights into the rheological modeling of semi-solid metals:Theoretical and simulation study显示文摘The power law model is the most widely used model for the rheological behavior of semi-solid metals(SSMs)in the numerical simulation of semi-solid processing.However,it is still not known why the anomalous negative flow exponent exists in the power law model for SSMs and its influence on the simulation.In this research,the rheological behavior of semi-solid Al-7Si-0.3Mg aluminum alloy is experimentally studied followed by modeling.The power law model fitting results show flow curves deviate from the experimental data and negative flow exponents,which are physically nonsensical and inapplicable to the simulation of SSMs flow proved by hydrodynamic analysis.This drawback of the power law model stems from neglecting the yield stress of SSMs.By contrast,the model referring Herschel-Bulkley(HB)theory which takes yield stress into consideration has reasonable flow exponent and yields good agreement between the fitting and experimental results.Furthermore,the simulation of die filling process is conducted,suggesting that the power law model over-optimistically predicts the tendency of blistering and misrun defects at low temperature and high filling velocity during semi-solid processing. | Zhen Ma Huarui Zhang Hanwei Fu Yanzhao Yang Jianji Wang Ming Du Hu Zhang | 2022 | Journal of Materials Science & Technology2022，，5： | 0 |
| 3 | Foldable high-strength electrode enabled by nanosheet subunits for advanced sodium-ion batteries显示文摘Power sources with strong mechanical properties and high-energy density are highly desirable for the next-generation flexible electronics.However,the challenge arises from the current electrode structure design,which is unable to bring both satisfactory mechanical and electrochemical properties with high active materials content and mass.Herein,we reported novel flexible,highstrength,and mechanically stable TiO_(2)-based film electrodes for advanced sodium-ion batteries,achieving an ultrahigh strength(up to≈60 MPa)and commercial-level areal capacity(4.5 mAh cm^(-2)).Highly-dispersed TiO_(2) and interlaced carbon nanotube(CNT)networks are embedded in the sheet-liked cellulose to form porous,high-conductive,and high-active TiO_(2)-C nanosheets that is basic building subunits of TiO_(2)-C films,allowing the films with structural robustness and origami-level flexibility.This strategy reconciles the contradiction between mechanical properties and active material content in flexible electrodes,and the fabricated electrode with a high TiO_(2) content of>65%can be bent more than 11000 times without breaking.Meanwhile,good capacity and excellent cycle stability(0.02‰capacity-decay rate over 9000 cycles)of TiO_(2)-C film under a higher active content(75%)has well satisfied the demands of flexible energy storage devices for electrochemical performances.This TiO_(2)-C subunit assembly methodology demonstrates enormous potential in high-strength/toughness flexible electrode construction for flexible electronics. | Hanwei Wang Jinzhou Fu Chao Wang Ruiwang Zhang Yingying Li Yushan Yang Haobo Li Qingfeng Sun Huiqiao Li | 2022 | InfoMat2022，4，2： | 0 |
| 4 | A high-safety, flame-retardant cellulose-based separator with encapsulation structure for lithium-ion battery显示文摘The safety issues of lithium-ion batteries have received attention because flammable organic electrolytes are used.Also,the commercial polyolefin separator will undergo severe thermal shrinkage when the internal temperature of the battery increases to 130-160°C,which increases the risk.Therefore,the development of a high thermal stability and high-safety separator is an effective strategy to improve battery safety.Herein,we design a green,cellulose-based separator(Cel@DBDPE)with a unique encapsulation structure for lithium-ion batteries,in which functional flame retardants(DBDPE)are wrapped in microscrolls formed by the self-rolling of 2D cellulose nanosheets upon freeze-drying.This structure can firmly anchor DBDPE particles in the separator to prevent them from undergoing exfoliation and does not affect the properties of the separator,such as the thickness and the pore structure.Compared with commercial polypropylene,Cel@DBDPE has excellent thermal stability and flame retardancy.The former makes it less prone to thermal shrinkage and the latter can effectively prevent the combustion of the electrolyte,showing an efficient self-extinguishing ability.Moreover,the Cel@DBDPE is only 15μm in size and has competitive properties comparable to polypropylene.Thus,there is no sacrifice in the electrochemical performance of battery when the Cel@DBDPE is used as separator.This study provides a new structural design for the construction of a high-safety separator. | Jinzhou Fu Hanwei Wang Zhichen Du Yao Liu Qingfeng Sun Huiqiao Li | 2023 | SmartMat2023，4，5： | 0 |
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