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Fabrication of 3D ordered needle-like polyaniline@hollow carbon nanofibers composites for flexible supercapacitors

Chinese Chemical Letters 2021年第8期32卷 2448-2452页

作者： Xuepeng Ni Yang Jiang Haoyu Chen Kunming Li Huifang Chen Qilin Wu Anqi Ju College of Materials Science and Engineering&State Key Laboratory for Modification of Chemical Fibers and Polymer Materials Donghua UniversityShanghai 201620China Zhejiang Provincial Key Laboratory of Yarn Material Forming and Composite Processing Technology Jiaxing UniversityShanghai 201620China Key Laboratory of High-Performance Fibers&Products Ministry of EducationDonghua UniversityJiaxing 314001China

Carbon nanofiber-based supercapacitors have broad prospects in powering wearable electronics owing to their high specific capacity,fast charge/discharge process,along with long-cycling ***,a poly(ac rylo n it rile-co-β-methyl hydrogen itaconate) copolymer was prepared and used to synthesize flexible hollow carbon nanofibers(HCNFs) via an electrospinning method without breaking after multiple ***,the inner and outer surfaces of HCNFs were evenly covered with ordered needlelike polyaniline(PANI) through in-situ polymerization methods to obtain three-dimensional flexible HCNFs/PANI composites,which exhibited a high capacity 1196.7 F/g at 1 A/g and good cycling stability(90.1% retention at 5 A/g after 3000 cycles).The symmetrical supercapacitor based on the HCNFs/PANI composites also delive red an outsta nding electrochemical performance with high energy/power density(60.28 Wh/kg at 1000 W/kg) and superior cycling durability(90% capacitance retention after at 5 A/g3000 cycles),which confirmed that the HCNFs/PANI composites had a wide application potential in flexible energy storage devices.

关键词： Flexible Polyaniline Electrospinning Hollow carbon nanofibers Supercapacitors

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Research of the influence factors on transesterification reaction degree in PC/PBT blends

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Advanced Industrial and Engineering Polymer Research 2019年第4期2卷 203-208页

作者： Zhao, Tipeng Ai, Junwei Wang, Peitao Tong, Wei Ding, Chao Cen, Yin Zhang, Mingqiu Plastic Modification and Processing of Product Research and Development Center National Engineering Laboratory Kingfa Technology Co Ltd. Guangzhou510520 China Key Laboratory for Polymeric Composite and Functional Materials of Ministry of Education GD HPPC Lab School of Chemistry Sun Yat-sen University Guangzhou510275 China

PC/PBT blends have excellent comprehensive properties and are widely used in the market. It's inevitable that transesterification reaction will take place in the melting process for this kind of blends, and this reaction has decisive effects on the blend properties, in this paper, the effects of resin ratio of PC to PBT, resin viscosity and processing technology on the transesterification reaction degree were studied. Considering that the reaction occurred at the phase interface of PC and PBT, with the combination of the phase morphology and crystallization behavior of PBT phase under different resin ratios, the correlation between phase morphology and transesterification degree was established. From the perspective of PBT phase, the lower its ratio is, the smaller its phase size is, the worse its crystallinity is, and the greater the transesterification degree, besides, the lower PBT resin viscosity, the higher the transesterification degree. Moreover, through the research on processing technology, the higher the extruder speed, the higher the transesterification degree. Those studies will provide direct guidance for further research on the influence factors of the transesterification degree and the actual processing of the corresponding products. © 2019 Kingfa SCI. & TECH. CO., LTD.

关键词： Transesterification

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What is the key Factor of Forming the "Core-Shell" Structure in the Blends of Two Polymers? "Entanglement Degree" or "Viscosity"

SSRN

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SSRN 2024年

作者： Shi, Yanqin Ni, Leikun Ma, Meng Chen, Si He, Huiwen Zhu, Yulu Wang, Xu College of Materials Science and Engineering Zhejiang University of Technology Hangzhou310014 China Key Laboratory of Plastic Modification and Processing Technology Research of Zhejiang Province Hangzhou310014 China

The key factor of forming a "core-shell" structure in the blends of two polymers after flowing in pipelines was revealed. The "core-shell" structure of high viscosity PP coated low viscosity PE was prepared by blending PP(T30S) and PE(2200J), PP(H2150) and PE(2200J) in a capillary rheometer at different shear rates. The results were not consistent with the principle of minimum viscous dissipation, while they were consistent with the principle of normal stress balance on the layered interface due to the entanglement degree of both PP(T30S) and PP(H2150) being higher than that of PE(2200J). However, the viscosity ratio of the two polymers had an effect on the integrity of the coating structure. Moreover, the core-shell structure could be obtained in a wider range of shear rates and was more complete when the volume ratio of PP(H2150) to PE(2200J) decreased from 2:1 to 1:2. It may be related to the fact that the small amount of PP could migrate to the outer layer in a shorter time. The "core-shell" structure could also be obtained by mixing high-polarity PA6(1010C2) with PP(T30S) or PP(H2150). The formation of a "core-shell" structure in both PA6(1010C2)/PP(T30S) and PA6(1010C2)/PP(H2150) complied with the high entanglement degree PA6 coated the low entanglement degree. The worse the compatibility of the two composites, the better the core-shell structure. The results meant the entanglement degree was the key factor in determining which polymer coated the other polymer. The principle of normal stress balance on the layered interface was more suitable for guiding the preparation of the core-shell structure blends. © 2024, The Authors. All rights reserved.

关键词： Polymer blends

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Recent Progress of Graphene Fiber/Fabric Supercapacitors:From Building Block Architecture,Fiber Assembly,and Fabric Construction to Wearable Applications

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Advanced Fiber Materials 2023年第3期5卷 896-927页

作者： Tuxiang Guan Zemei Li Dianchun Qiu Guan Wu Jian Wu Liping Zhu Meifang Zhu Ningzhong Bao State Key Laboratory of Materials‑Oriented Chemical Engineering College of Chemical EngineeringNanjing Tech UniversityNanjing 210009People’s Republic of China National Engineering Lab for Textile Fiber Materials and Processing Technology School of Materials Science and EngineeringZhejiang Sci-Tech UniversityHangzhou 310018People’s Republic of China State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and EngineeringDonghua UniversityShanghai 201620People’s Republic of China

High-performance fiber-shaped power sources are anticipated to considerably contribute to the continuous development of smart wearable *** one-/two-dimensional(1D/2D)frameworks constructed from graphene sheets,graphene fibers and fabrics inherit the merits of graphene,including its lightweight nature,high electrical conductivity,and exceptional mechanical *** as-fabricated graphene fiber/fabric flexible supercapacitor(FSC)is,therefore,regarded as a promis-ing candidate for next-generation wearable energy storage devices owing to its high energy/power density,adequate safety,satisfactory flexibility,and extended cycle *** gap between practical applications and experimental demonstrations of FSC is drastically reduced as a result of technological *** this end,herein,recent advancements of FSCs in fiber element regulation,fiber/fabric construction,and practical applications are methodically reviewed and a forecast of their growth is presented.

关键词： Graphene fibers/fabrics Flexible supercapacitor Element regulation Fiber/fabric construction Wearable application

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Morphology and Properties of PBT/SEBS and PBT/SEBS-G-MAH Blends

Morphology and Properties of PBT/SEBS and PBT/SEBS-G-MAH Ble...

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2014功能材料国际会议

作者： Xiang Lu Jintao Huang Guangjian He Jinping Qu The Key Laboratory of Polymer Processing Engineering of the Ministry of Education National Engineering Research Center of Novel Equipment for Polymer Processing National Engineering Laboratory of the Plastic modification and Processing South China University of Technology

A series of poly(butylene terephthlate)(PBT)/ styrene-ethylene/butylene-styrene(SEBS) and PBT/(styrene-ethylene/butylene-styrene)-G-(Maleic anhydride)(SEBS-G-MAH) blends were prepared by melt blending *** the morphology,thermal and mechanical properties were studied to identify the effect of SEBS or SEBS-G-MAH weight fraction on the properties of *** scanning calorimetry(DSC) analysis indicate that all the SEBS and SEBS-G-MAH could affect crystallization of PBT,but the effect of SEBS-G-MAH on the crystallization behavior of PBT was more obvious,because of the reaction between SEBS-G-MAH and PBT hinder the movement and fold in the order of PBT molecular *** Electronic Microscope(SEM) show that the minor phase was hardly distinguishable in the blend of PBT/SEBS-G-MAH as the result of the improvement in dispersibility,compared with PBT/SEBS *** mechanical properties analysis(DMA) confirms that there are well miscibility between PBT and SEBS-G-MAH and immiscibility between PBT and *** these results lead to the different mechanical and dynamic mechanical properties between PBT/SEBS and PBT/SEBS-G-MAH blends.

关键词： keyworks:PBT/SEBS blend PBT/SEBS-G-MAH blend morphology properties

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Numerical simulation of two-track laser hardening process of 42CrMo steel

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Heat Treatment and Surface Engineering 2022年第1期4卷 20-34页

作者： Daming, Tong Ziyang, Zhang Zhuguo, Li Jianfeng, Gu Sijia, Li Qunli, Zhang Chuanwei, Li Junyu, Zhao Zhaonan, Hu Institute of Materials Modification and Modelling School of Materials Science and Engineering Shanghai Jiao Tong University Shanghai China Shanghai Key Laboratory of Materials Laser Processing and Modification Shanghai Jiao Tong University Shanghai China Openlaser Labs Huzhou RayOpen Research Institute Huzhou China Institute of Laser Advanced Manufacturing Zhejiang University of Technology Hangzhou China Chongqing Gearbox Co. LTD Chongqing China

In this study, a thermal–phase–mechanical coupled numerical model was presented for the prediction of the distribution of temperature, phase and residual stress of 42CrMo steel during two-track laser hardening process. Austenite and tempering transformation were simulated based on the isoconversional method. K-M equation was used to calculate the fraction of martensite. Residual stress was calculated considering the thermal strain, transformation strain and transformation plasticity. The accuracy of the numerical model was verified according to the comparison with experimental results. The stress distribution of two-track laser hardening process was studied according to numerical simulation results. And the effect of the second track on the residual stress produced by the first track in two-track laser hardening was also analyzed by using this numerical model. © 2022 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group.

关键词： Laser hardening numerical simulation overlapping residual stress

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Interactions between TiAl and ZrO2 face coat during centrifugal investment casting

Interactions between TiAl and ZrO2 face coat during centrifu...

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International Conference on Frontiers of Energy, Materials and Information Engineering, ICFMEI 2014

作者： Chen, Yan Fei Chen, Yuong Tu, Jiang Ping Zheng, Shun Qi Department of Materials Science and Engineering Zhejiang University Hangzhou China Ningbo Key Laboratory of Precision Plastic Processing of Metals Ningbo Branch of China Ordnance Academy Ningbo China School of Materials Science and Engineering Harbin Institute of Technology Harbin China

ISBN: (纸本)9783038352778

γ-TiAl alloys are emerging as potential light-weight, high-temperature structural materials and possess wide capacities of engineering applications in aeronautics, space and automobile industries because of their low density, high specific strength and specific modulus, good oxidation-resistance and creep-resistance. Investment casting is introduced to complex TiAl net-shape or near net-shape components. In this research, ZrO2 (CaO stabilized) was chosen as the face coat materials for the investment casting of TiAl alloys. The present study mainly focuses on the fabrication of ceramic shell mould for TiAl investment casting. Optimisation of reducing the stress in cast-mould system was carried out. The processing technology of the invented ceramic shell moulds was successfully verified in the investment casting of prototype TiAl parts. The interfacial reaction between TiAl alloys and ZrO2 ceramic mould was analyzed using OM, SEM, EDS and XRD. The experimental results showed that, when the rotation speed is 200 rpm and 400 rpm, the thickness of reaction layer is about 5μm and 20μm, respectively. © (2014) Trans Tech Publications, Switzerland.

关键词： Titanium alloys

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Superhydrophobic Pctfe-Based Microporous Membrane For Water/Oil Emulsion Separation in Various Environments

SSRN

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SSRN 2024年

作者： He, Lu Qin, Jinxian Zhang, Wanli Chen, Rong Zhu, Weiwei Li, Jiang Guo, Shaoyun Shen, Jiabin State Key Laboratory of Polymer Materials Engineering Polymer Research Institute Sichuan University Sichuan Provincial Engineering Laboratory of Plastic Rubber Complex Processing Technology Chengdu610065 China Zhejiang Chemical Industry Research Institute Co. Ltd. Hangzhou310023 China

The separation of oil from oily water is a critical endeavor owing to the escalating global oil pollution. Membrane separation technology has gained widespread adoption for oily water treatment. Inspired by the vertical segregation phenomenon in drying multi-component suspensions, this study proposed an evaporation-induced stratification coupled with sacrificial template method to prepare superhydrophobic polychlorotrifluoroethylene (PCTFE) membrane for fast gravity-driven oil/water separation. The precursor of PCTFE microporous membranes, PCTFE/fluoroelastomer/hydrophobic silica nanoparticles (PCTFE/FR/SiO2) composite films, were fabricated via a solvent-assisted method. Induced by solvent evaporation, the pre-fabricated composite films exhibited a stratified structure, where SiO2 nanoparticles enriched near the top surfaces, making it easily tailor the surficial wettability. For the matrix, PCTFE-rich domains and FR-rich domains intersected, forming a bicontinuous structure. After sacrificing FR, PCTFE porous membranes were obtained. Meanwhile, the PCTFE-based porous skeletons combining with surface enriched SiO2 nanoparticles constructed a multi-level roughness, thus achieving superhydrophobicity. The optimized membrane possessed an average pore size of ~1.84 μm, a porosity of ~60%, and a WCA above 155°, owning excellent self-cleaning properties and efficient oil/water separation ability. The membrane exhibited remarkable capability in various oil/water mixtures, including emulsified water-in-oil. The separation flux and oil recovery purity for water-in-dichloromethane emulsion were up to 2843±84 L/(m2·h) and 99.95 wt%, respectively. Furthermore, though being immersed into various organic solvents for 7 days or experiencing 15 separation cycles, the performances of the membranes hardly changed. Accordingly, this work provides a practical approach for tailoring surficial wettability and fabricating PCTFE-based membranes suitable for oil/water separation fields. ©

关键词： Wetting

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Laser-Directed Energy Deposition of Low-Carbon Low-Temperature Ultra-Fine Bainitic Steel: Multi-Physical Modelling, Metallurgy and Performance Studies

SSRN

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SSRN 2023年

作者： Guo, Yanbing Wu, Dongsheng Chen, Yuan Wang, Lyuyuan Chi, Yuanqing Feng, Kai Li, Zhuguo Ma, Ninshu College of Ocean Science and Engineering Institute of Marine Materials Science and Engineering Shanghai Maritime University Shanghai201306 China Osaka University 11-1 Mihogaoka Osaka Ibaraki567-0047 Japan Key Laboratory of Crop Harvesting Equipment Technology of Zhejiang Province Jinhua Polytechnic Jinhua321017 China School of Materials Science and Engineering Nanjing University of Science and Technology Nanjing210094 China School of Mechanical and Electrical Engineering Guangdong University of Technology Guangzhou510006 China Shanghai Key Lab of Materials Laser Processing and Modification School of Materials Science and Engineering Shanghai Jiao Tong University Shanghai200240 China

An innovative iron-based alloy powder characterized by reduced carbon content and elevated Mn content was developed, leading to the fabrication of iron-based ultrafine bainitic steel with exceptional mechanical properties utilizing laser-directed energy deposition (L-DED). The layers' morphology, microstructure, phase composition, and elemental distribution were analyzed, indicating that the melting depth of the layer was deep and ultra-fine dendrite formed in the top region. A multi-physical powder and melt pool simulation was conducted to analyze the melt flow and pool solidification characteristics, showing that the strong downward flow inside the molten pool caused by the powder impingement leaded to the increase of the melting depth. The cooling rate G×R, where G was the temperature gradient and R was the solidification rate, was higher at the top pool boundary, which facilitated the ultra-fine dendrite formation at this location. Following subsequent low-temperature isothermal heat treatment, a refined bainitic microstructure emerged within the deposited layer. The bainitic plates in the 573K isothermally transformed bainite were interspersed with film-retained austenite (RA). Conversely, the bainitic plates formed at a lower temperature (523K) exhibited a coalesced morphology, stemming from the diminished stability of super-cooled austenite. The bainite plates underwent growth and coalescence, ultimately giving rise to the bainitic microstructure. The 523K transformed coatings demonstrated superior hardness (509.2 HV), strength (1435 MPa), and elongation (11.5%) compared to the 573K transformed coatings (456.5 HV, 1241 MPa, 10.1%). This research holds significant implications for the advancement of low-carbon bainitic materials with remarkable comprehensive mechanical properties in additive manufacturing applications. © 2023, The Authors. All rights reserved.

关键词： Bainite

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