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A novel reprocessable chloroprene rubber based on dynamic disulfide metathesis

International Journal of Smart and Nano Materials 2024年第1期15卷 42-61页

作者： Jianliang Jiang Junxue Zhai Yanqing Chen dongqi Zhao Yakai Feng School of Chemical Engineering and Technology Collaborative Innovation Center of Chemical Science and Chemical Engineering(Tianjin)Tianjin UniversityTianjinChina R&D Department of China(Yangzhou) Material Handling Tech-Engineering LtdYangzhouChina Key Laboratory of Rubber Plastics of Ministry of Education/Shandong Province (QUsT)School of Polymer Science&EngineeringQingdao University of Science&TechnologyQingdaoChina R&D Department of Tianjin Joaboa Technology Co.Ltd TianjinP.R.China Frontiers Science Center for Synthetic Biology Tianjin UniversityTianjinChina Key Laboratory of Systems Bioengineering(Ministry of Education) Tianjin UniversityTianjinChina

For sustainable application of chloroprene rubber(Cr),a new technology is developed by the vulcanization of Cr using 2,2'-dithiodipyridine(dPd)as a cross-linking agent with the repro-cessing performance owing to disulfde *** dPd was incorporated into Cr vulcanization,the Menschutkin reac-tion between allyl chloride group and pyridine group occurred with a maximum exothermic peak at 184°*** number of effective cross-linking bond at o.5 phr dPd vulcanizate was higher than that at high dPd *** vulcanizate showed high tensile strength(11.12 MPa)and elongation at break(1253±120%)owing to the exchangeable disulfide bond in the *** the catalysis of triphenylphosphine,the metathesis of disulfide compound was improved obviously,which endowed Cr/dPd vulcanizates with good recyclability *** cross-linkage maintains its stability at low temperature,thus ensuring the mechanical stability of Cr/dPd vulcanizate under the ambient *** and reprocessing of Cr/dPd vulcanizate can be conducted with common industrial rubber processing *** reprocessable chloroprene rubber could have potential appli-cation in Cr industry,also serve to significantly improve envir-onmental sustainability.

关键词： Chloroprene rubber reprocessable Menschutkin reaction disulfide

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Microstructure and Shear Properties Evolution of Minor Fe-doped SAC/Cu Substrate Solder Joint under Isothermal Aging

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Acta Metallurgica Sinica(English Letters) 2024年第7期37卷 1279-1290页

作者： Quanzhen Li Chengming Li Xiaojing Wang Shanshan Cai Jubo Peng Shujin Chen Jiajun Wang Xiaohong Yuan Jiangsu University of Science and Technology Zhenjiang212003China R&D Center Yunnan Tin Group(Holding)Co.LtdKunming650000China The 58 Research Institute of China Electronics Technology Group CorporationWuxi214100China Yunnan Precious Metals Lab Sino-Platinum Metals Co.LtdKunming650156China

different amounts of Fe(0.005,0.01,0.03,0.05,and 0.07 wt%)were added to SAC305 to study the shear behavior damage of Fe-doped SAC solder joints under thermal loading(170℃,holding time of 0,250,500,and 750 h).The results show that during isothermal aging at 170℃,the average shear force of all solder joints decreases with increasing aging time,while the average fracture energy first increases and then decreases,reaching a maximum at 500 *** Fe doping could both increase shear forces and related fracture energy,with the optimum Fe doping amount being 0.03 wt%within the entire aging *** is because the doping Fe reduces the undercooling of the SAC305 alloy,resulting in the microstructure refining of solder *** in turn causes the microstructure changing from network structure(SAC305 joint:eutectic network+β-Sn)to a single matrix structure(0.03Fe-doped SAC305 joint:β-Sn matrix+small compound particles).Specifically,Fe atoms can replace some Cu in Cu_(6)Sn_(5)(both inside the solder joint and at the interface),and then form(Cu,Fe)_(6)Sn_(5) compounds,resulting in an increase in the elastic modulus and nanohardness of the ***,the growth of Cu_(6)Sn_(5) and Cu_(3)Sn intermetallic compounds(IMC)layer are inhibited by Fe doping even after the aging time prolonging,and Fe aggregates near the interface compound to form FeSn_(2).This study is of great significance for controlling the growth of interfacial compounds,stabilizing the microstructures,and providing strengthening strategy for solder joint alloy design.

关键词： SAC305 solder Fe doping Shear mechanical behavior Isothermal aging Interfacial intermetallic compounds(IMC)

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Preparation of Fe-Al Hollow Nano-spherical Catalyst and its Application in Catalytic Cracking of Ethane for Carbon Nanotube Production

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China Petroleum Processing & Petrochemical technology 2024年第4期26卷 39-48页

作者： Liu Bei Wang Taoxiang Li Kang Sun Hongman Wang Youhe Yan Zifeng State Key Laboratory for Heavy Oil Processing China University of PetroleumQingdao 266580China Luoyang R&D Center of Technology of SINOPEC Engineering(Group)Co.Ltd. Luoyang 471003China

Fe-Al catalysts with hollow nano-spherical structures were synthesized following the hard template method using self-made carbon spheres as *** catalytic performance of these catalysts in the production of carbon nanotubes(CNTs)was evaluated through ethane catalytic cracking on a fixed bed ***,the influence of these hollow nanospheres on the yield and quality of CNTs was *** results showed that compared to the irregular-shaped catalyst synthesized by coprecipitation and the catalyst with micro-spherical structures prepared by the impregnation method,the Fe-Al hollow nano-spherical catalysts exhibited significantly enhanced specific surface area and pore volume,reaching 236 m^(2)/g and 0.77 cm^(3)/g,*** a reaction temperature of 700℃ and an ethane feed rate of 90 mL/min,the CNTs yield of Fe-Al hollow nano-spherical catalyst reached as high as 48.6 gCNT/gcat,which was 1.8 and 4.6 times higher than the yield of irregular-shaped(27.7 gCNT/gcat)and micro-spherical(10.5 gCNT/gcat)catalysts,*** was mainly attributed to the hollow cavity structure of Fe-Al catalyst providing sufficient space for the CNTs *** a result,the blockage of catalyst internal pores was prevented by the formed CNTs,which isolated ethane molecules from the active sites and lead to catalyst ***,the CNTs synthesized by Fe-Al hollow nano-spherical catalyst exhibited a uniform diameter distribution and a higher degree of graphitization.

关键词： Fe-Al oxides carbon nanotubes hollow nanospheres ethane catalytic cracking

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Organic matter occurrence and pore-forming mechanisms in lacustrine shales in China

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Petroleum Science 2022年第4期19卷 1460-1472页

作者： Li-Chun Kuang Lian-Hua Hou Song-Tao Wu Jing-Wei Cui Hua Tian Li-Jun Zhang Zhong-Ying Zhao Xia Luo Xiao-Hua Jiang Science and Technology R&D Department CNPCBeijing100000China Research Institute of Petroleum Exploration and Development CNPCBeijing100083China National Energy Tight Oil and Gas R&D Center Beijing100083China Key Laboratory of Oil and Gas Reservoirs CNPCBeijing100083China

The evolution of pore structure in shales is affected by both the thermal evolution of organic matter(OM)and by inorganic diagenesis,resulting in a wide variety of pore *** paper examines the OM distribution in lacustrine shales and its influence on pore structure,and describes the process of porosity *** principal findings are:(i)Three distribution patterns of OM in lacustrine shales are distinguished;laminated continuous distribution,clumped distribution,and stellate scattered *** differences in total organic carbon(TOC)content,free hydrocarbon content(S_(1)),and OM porosity among these distribution patterns are discussed.(ii)Porosity is negatively correlated with TOC and plagioclase content and positively correlated with quartz,dolomite,and clay mineral content.(iii)Pore evolution in lacustrine shales is characterized by a sequence of decreasing-increasing-decreasing porosity,followed by continuously increasing porosity until a relatively stable condition is reached.(iv)A new model for evaluating porosity in lacustrine shales is *** this model,the organic and inorganic porosity of shales in the Permian Lucaogou Formation are calculated to be 2.5%-5%and 1%-6.3%,respectively,which correlate closely with measured *** findings may provide a scientific basis and technical support for the sweet spotting in lacustrine shales in China.

关键词： Shale oil Unconventional oil and gas Organic matter Pore evolution Log interpretation model

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dynamic Location Method for Shallow Ocean Bottom Nodes Using the Levenberg-Marquart Algorithm

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Journal of Ocean University of China 2024年第4期23卷 953-960页

作者： TONG Siyou LI Junjie XU Xiugang FANG Yunfen WANG Zhongcheng Key Laboratory of Submarine Geosciences and Prospecting Techniques MOEOcean University of ChinaQingdao 266100China Laboratory for Marine Mineral Resources Qingdao Marine Science and Technology CenterQingdao 266237China R&D Center of BGP CNPCZhuozhou 072751China Insitute of Shengli Oilfield SINOPECDongying 257022China

Ocean bottom node(OBN)data acquisition is the main development direction of marine seismic exploration;it is widely promoted,especially in shallow sea ***,the OBN receivers may move several times because they are easily affected by tides,currents,and other factors in the shallow sea environment during long-term *** uncorrected,then the imaging quality of subsequent processing will be *** conventional secondary positioning does not consider the case of multiple movements of the receivers,and the accuracy of secondary positioning is *** first arrival wave of OBN seismic data in shallow ocean mainly comprises refracted *** this study,a nonlinear model is established in accordance with the propagation mechanism of a refracted wave and its relationship with the time interval curve to realize the accurate location of multiple receiver *** addition,the Levenberg-Marquart algorithm is used to reduce the influence of the first arrival pickup error and to automatically detect the receiver movements,identifying the accurate dynamic relocation of the *** simulation and field data show that the proposed method can realize the dynamic location of multiple receiver movements,thereby improving the accuracy of seismic imaging and achieving high practical value.

关键词： OBN dynamic location method Levenberg-Marquart algorithm seismic exploration of shallow sea

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distributed-array radar system with synchronization using known targets 8

Distributed-array radar system with synchronization using kn...

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8th Asia-Pacific Conference on Synthetic Aperture radar, APSAr 2023

作者： Takahashi, Yoshiki Yamada, Hiroyoshi Hagiwara, Tatsuya Oshima, Tadashi Mitsubishi Electric Corporation Information and Technology R&D Center Kanagawa Japan Graduate School of Science & Technology Niigata University Niigata Japan

ISBN: (纸本)9798350393590

recently, radar systems with distributed-array antennas, in which multiple phased arrays are distributed and the received signals from each phased array (hereafter called subarrays) are combined, have been considered to improve radar detection performance and reduce costs. However, when synchronizing the transmit-receive timing between subarrays, signal lines across boards and housings are required for synchronization, which increases the size of the equipment. To solve this problem, this paper proposes a distributed radar system in which each subarray has an independent reference signal source and uses a known signal for synchronization. A prototype of the distributed radar system is also presented, and the principle of the proposed system is verified using actual data. ©2023 IEEE.

关键词： Synchronization

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Open-delta Flux-Modulating Consequent Pole Motors

Open-Delta Flux-Modulating Consequent Pole Motors

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2023 IEEE International Magnetic Conference - Short Papers, INTErMAG Short Papers 2023

作者： Mitsuda, Hiroshi Fukami, Tadashi Koyama, Masato Tanaka, Toshinori Graduate School of Engineering Kanazawa Institute of Technology Ishikawa Japan Advanced Technology R&D Center Mitsubishi Electric Corporation Hyogo Japan

ISBN: (纸本)9798350338362

This paper proposes a new variable-flux permanent magnet (PM) motor, named the "open-delta flux-modulating consequent pole motor (OFCM)."The armature winding of the proposed OFCM is connected in open-delta and is also used as a field winding by simultaneously supplying a three-phase armature current and a dC field current. The flux linkage of the armature winding can be adjusted by changing the field current. The flux-regulation capability of the OFCM is confirmed through three-dimensional finite element analysis (3-d FEA) and experiments conducted on a prototype machine. © 2023 IEEE.

关键词： AC motors

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High sensitivity thermal diode infrared sensors using a thin metal film absorber 49

High sensitivity thermal diode infrared sensors using a thin...

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Infrared technology and Applications XLIX 2023

作者： Kobayashi, S. Shintani, K. Hanaoka, M. Hata, H. Fujisawa, d. Imaki, M. Suzuki, N. Mitsubishi Electric Corporation Information Technology R&D Center 5-1-1 Ofuna Kamakura Kanagawa247-8501 Japan Mitsubishi Electric Corporation Advanced Technology R&D Center 8-1-1 Tsukaguchi-Honmachi Amagasaki Hyogo661-8661 Japan

ISBN: (数字)9781510661837

ISBN: (纸本)9781510661820

We demonstrate an improvement in the thermal sensitivity of the MeldIr thermal diode infrared sensor which was launched by Mitsubishi Electric Corporation in 2019. To improve the thermal sensitivity of a MeldIr sensor while suppressing any increase in its thermal time constant, we proposed a high thermal absorption pixel structure using an Ir absorber composed of a thin metal film. The thin metal film is deposited on the upper layer of the layer of p-n junction diodes. We used a flat structure which has almost the same layer structure as the original MeldIr temperature sensor to confirm the effect of the thin metal film. The measured results showed that the average Ir absorbance of the sample at wavelengths from 8 to 14 μm was improved by up to approximately 160%. This value agrees approximately with the calculated results using a Fresnel equation model. Based on these initial results, we numerically estimated the performance of the temperature sensor used in MeldIr using the high thermal absorption pixel structure and verified that the thermal sensitivity of that used in MeldIr had been improved while also suppressing any increase in the thermal time constant. © 2023 SPIE.

关键词： diodes

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Experimental research regarding the Flow Pattern and Pressure drop in a Slurry Composed of Polypropylene-Particles 9

Experimental Research Regarding the Flow Pattern and Pressur...

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9th International Conference on Advances in Machinery, Materials Science and Engineering Applications, MMSE 2023

作者： Fan, Jinchao Xu, Zhaohui Fang, Chao Lin, Zili Cnpc Engineering Technology R&d Company Limited China National Engineering Research Center for Oil and Gas Drilling and Completion Technology China

ISBN: (纸本)9781643684383

Pipelines used for product transportation require regular cleaning. A new method has emerged using slurry for the cleaning process, during which the flow pattern and pressure drop in the slurry are essential. The flow of slurry containing polypropylene particles was investigated using a laboratory-scale, closed-circuit pipeline facility. While the slurry was pumped, the pressure drop was measured, and the flow pattern was observed regarding particle type, slurry particle concentration, and slurry flow velocity. The results showed that after the critical flow velocity, the particles mixed uniformly with the water in the pipe, increasing the pressure drop in conjunction with the flow velocity. Although a higher particle mass fraction and small particle size reduced the critical flow velocity, the mass fraction and particle size had no significant influence on the pressure drop. This research establishes a solid foundation for the practical application of this cleaning method. © 2023 The Authors.

关键词： Flow patterns

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Microstructure Evolution,Tribological and Corrosion Properties of Amorphous Alloy Strengthening Stainless Steel Fabricated by Selective Laser Melting in NaCl Solution

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Acta Metallurgica Sinica(English Letters) 2024年第5期37卷 825-839页

作者： Pengwei Jiang Gang Wang Yaosha Wu Zhigang Zheng Zhaoguo Qiu Tongchun Kuang Jibo Huang dechang Zeng School of Materials Science and Engineering South China University of TechnologyGuangzhou 510640China Zhongshan R&D Center for Materials Surface and Thin Films Technology of the South China University of Technology Gent Materials Surface Technology(Guangdong)Co.Ltd.Zhongshan 528437China Zhongshan Torch Polytechnic Zhongshan 528436China Yangjiang Branch Guangdong Laboratory Materials Science and Technology Yangjiang Advanced Alloys LaboratoryYangjiang 529599China

As a type of austenitic stainless steel,316L stainless steel has excellent plasticity,corrosion resistance,and biocompatibility,making it widely used in industries,especially in the marine ***,its lower yield strength and wear resistance are the obvious disadvantages that restrict its application in more *** this work,an Fe-based amorphous alloy(Fe^(am))was selected as reinforcement to enhance the 316L stainless steel prepared by selective laser melting(SLM),and microstructure evolution,mechanical properties,tribological and corrosion performance of the SLMed samples were investigated in *** relative density values of both 316L stainless steel and Fe^(am)-reinforced samples are above 99%,which suggests that Fe^(am)-reinforced samples also have outstanding *** the as-etched micrograph,all of the SLMed samples exhibit cellular ***^(am)-reinforced samples have thicker sub-grain boundaries,and retained amorphous phase can be observed in the samples reinforced with 10 wt%and 15 wt%Fe^(am).As the addition of Fe^(am) increases,the microhardness and compression strength of the Fe^(am)-reinforced samples gradually improve and reach 449.2 HV and 2181.9 MPa,*** wear morphologies show that the 316L stainless steel and Fe^(am)-reinforced samples both experience abrasive wear and corrosion wear in a 3.5 wt%NaCl ***,as the amount of Fe^(am) added increases,the coefficient of friction and wear rate of SLMed samples gradually *** to the unreinforced sample,Fe^(am)-reinforced samples have lower corrosion current density and higher pitting potential according to the potentiodynamic polarization curves and also exhibit superior corrosion resistance in the salt spray *** work suggests that the addition of Fe-based amorphous alloy can improve the mechanical properties and wear resistance of 316L stainless steel,as well as its ability to withstand salt spray corrosion.

关键词： Selective laser melting 316L stainless steel Amorphous alloy Tribology Corrosion

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