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Organic photovoltaic cell with 17% efficiency and superior processability

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National Science Review 2020年第7期7卷 1239-1246页

作者： Yong Cui Huifeng Yao Ling Hong Tao Zhang Yabing Tang Baojun Lin Kaihu Xian Bowei Gao Cunbin An Pengqing Bi Wei Ma Jianhui Hou State Key Laboratory of Polymer Physics and Chemistry Beijing National Laboratory for Molecular Sciences CAS Research/Education Center for Excellence in Molecular Sciences Institute of Chemistry Chinese Academy of Sciences University of Chinese Academy of Sciences State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong University

The development of organic photoactive materials, especially the newly emerging non-fullerene electron acceptors(NFAs), has enabled rapid progress in organic photovoltaic(OPV) cells in recent *** the power conversion efficiencies(PCEs) of the top-performance OPV cells have surpassed 16%,the devices are usually fabricated via a spin-coating method and are not suitable for large-area ***, we demonstrate that the fine-modification of the flexible side chains of NFAs can yield 17% PCE for OPV cells. More crucially, as the optimal NFA has a suitable solubility and thus a desirable morphology, the high efficiencies of spin-coated devices can be maintained when using scalable blade-coating processing technology. Our results suggest that optimization of the chemical structures of the OPV materials can improve device performance. This has great significance in larger-area production technologies that provide important scientific insights for the commercialization of OPV cells.

关键词： organic photovoltaic cells power conversion efficiency scalable large-area production processability non-fullerene acceptor

Sub-5 nm porous polymer decoration toward superhydrophobic MOFs with enhanced stability and processability

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Chinese Chemical Letters 2022年第4期33卷 2134-2138页

作者： Siyi Rong Pengcheng Su Shizheng Chen Miaomiao Jia Wanbin Li Guangdong Key Laboratory of Environmental Pollution and Health School of EnvironmentJinan UniversityGuangzhou 511443China

Metal-organic frameworks(MOFs) show great potential for various applications, but many of them suffer from the drawbacks of hydrolysis propensity and poor processability. Herein, we employ polymers of intrinsic microporosity(PIMs) with hydrophobic pores to decorate MOFs toward substantially improved water stability and shapeability. Through simple PIM-1 decoration, the sub-5 nm polymer layers can be uniformly deposited on MOF surfaces with almost no deterioration in porosity. Owing to the existence of superhydrophobic coating and the obstruction of water entrance into MOFs, the PIM-1 coated Cu BTC exhibits impressive water resistance and excellent pore preservation ability after exposure in water, even in acidic and alkaline solutions. Moreover, polymer decoration improves the processability of MOFs, while various MOF/PIM-1 bulk wafers and oil-water separators can be obtained straightforwardly.

关键词： Metal-organic framework Porous polymer decoration Hydrophobicity Stability processability

RHEOLOGICAL CHARACTERIZATION OF processability OF UNVULCANIZED POLYBUTADIENE

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Chinese Journal of Polymer Science 1987年第1期5卷 81-86页

作者：杜雪许元泽钱人元 Academia Sinica Beijing Institute of Chemistry

Rheological investigation on a series ot unvulcamzed polybutadiene elastomers of different processability has been carried out by means of a capillary extrusion rheometer. It is found that the processability of unvulcanized polybutadiene can be correlated with the occurrence of unsteady flow and the wall stress, dependence of the dimensionless number e characterizing the entrance elongational elasticity which has been found to be sensitive to the branching structure and the molecular weight distribution of the samples. Interpretations based on the structural data of unvulcanized polybutadiene were discussed.

关键词： Rheology Polybutadiene processability Elongational elasticity

High-strength and thermally stable TiB_(2)-modified Al-Mn-Mg-Er-Zr alloy fabricated via selective laser melting

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International Journal of Minerals,Metallurgy and Materials 2024年第10期31卷 2221-2232页

作者： Jiang Yu Yaoxiang Geng Yongkang Chen Xiao Wang Zhijie Zhang Hao Tang Junhua Xu Hongbo Ju Dongpeng Wang School of Materials Science and Engineering Jiangsu University of Science and TechnologyZhenjiang 212003China Beijing Advanced Innovation Center for Materials Genome Engineering Institute for Advanced Materials and TechnologyUniversity of Science and Technology BeijingBeijing 100083China National Engineering Research Center of Near-Net Shape Forming for Metallic Materials Guangdong Provincial Key Laboratory for Processing and Forming of Advanced Metallic MaterialsSouth China University of TechnologyGuangzhou 510640China CEMMPRE-Centre for Mechanical Engineering Materials and Processes Department of Mechanical EngineeringUniversity of CoimbraRua Luís Reis SantosCoimbra 3030-788Portugal

To increase the processability and plasticity of the selective laser melting(SLM)fabricated Al-Mn-Mg-Er-Zr alloys,a novel TiB_(2)-modified Al-Mn-Mg-Er-Zr alloy with a mixture of Al-Mn-Mg-Er-Zr and nano-TiB_(2) powders was fabricated by *** pro-cessability,microstructure,and mechanical properties of the alloy were systematically investigated by density measurement,microstruc-ture characterization,and mechanical properties *** alloys fabricated at 250 W displayed higher relative densities due to a uni-formly smooth top surface and appropriate laser energy *** maximum relative density value of the alloy reached(99.7±0.1)%,demonstrating good *** alloy exhibited a duplex grain microstructure consisting of columnar regions primarily and equiaxed regions with TiB_(2),Al6Mn,and Al3Er phases distributed along the grain *** directly aging treatment at a high tem-perature of 400℃,the strength of the SLM-fabricated TiB_(2)/Al-Mn-Mg-Er-Zr alloy increased due to the precipitation of the secondary Al6Mn *** maximum yield strength and ultimate tensile strength of the aging alloy were measured to be(374±1)and(512±13)MPa,*** SLM-fabricated TiB_(2)/Al-Mn-Mg-Er-Zr alloy demonstrates exceptional strength and thermal stability due to the synergistic effects of the inhibition of grain growth,the incorporation of TiB_(2) nanoparticles,and the precipitation of secondary Al6Mn nanoparticles.

关键词： selective laser melting aluminum alloy processability mechanical properties thermal stability

Crack elimination and strength enhancement mechanisms of selective laser melted Si-modified Al−Mn−Mg−Er−Zr alloy

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Transactions of Nonferrous Metals Society of China 2024年第8期34卷 2431-2441页

作者： Jiang YU Yao-xiang GENG Hong-bo JU Zhi-jie ZHANG Jun-hua XU School of Materials Science and Engineering Jiangsu University of Science and TechnologyZhenjiang 212100China Department of Mechanical Engineering CEMMPRE-Centre for Mechanical Engineering Materials and ProcessesUniversity of CoimbraCoimbraPortugal

In order to increase the processability and process window of the selective laser melting(SLM)-fabricated Al−Mn−Mg−Er−Zr alloy,a novel Si-modified Al−Mn−Mg−Er−Zr alloy was *** effect of Si alloying on the surface quality,processability,microstructure,and mechanical properties of the SLM-fabricated alloy was *** results showed that introducing Si into the Al−Mn−Mg−Er−Zr alloy prevented balling and keyhole formation,refined the grain size,and reduced the solidification temperature,which eliminated cracks and increased the processability and process window of the *** maximum relative density of the SLM-fabricated Si/Al−Mn−Mg−Er−Zr alloy reached 99.6%.The yield strength and ultimate tensile strength of the alloy were(371±7)MPa and(518±6)MPa,*** values were higher than those of the SLM-fabricated Al−Mn−Mg−Er−Zr and other Sc-free Al−Mg-based alloys.

关键词： selective laser melting Al−Mn−Mg−Er−Zr−Si alloy surface roughness processability mechanical properties

SYNTHESIS AND CHARACTERIZATION OF POLY(PHTHALAZINONE BIPHENYL ETHER SULFONE KETONE)S FROM 4,4'-DICHLOROBENZOPHENONE

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Chinese Journal of Polymer Science 2011年第6期29卷 719-725页

作者：刘程蹇锡高 Department of Polymer Science and Materials College of Chemical EngineeringDalian University of Technology Liaoning Province Engineering Center of High Performance Resins

A series ofpoly（aryl ether sulfone ketone）s containing phthalazinone and biphenyl moieties were synthesized by aromatic nucleophilic displacement polycondensation of 4-（4-hydroxylphenyl）（2H）-phthalazin-l-one （DHPZ）, 4,4＇- dichlorobenzophenone （DCB）, 4,4＇-dichlorodiphenyl sulfone （DCS） and 4,4＇-biphenol （BP） in different molar ratios. The obtained copolymers were characterized by different instrumental techniques （FTIR, TGA, DSC, WAXD, etc.）. The inherent viscosities of these polymers were in the range of 0.43-0.56 dL g^-1. They were amorphous and had good solubility in polar aprotic organic solvents. The copolymers exhibited high glass transition temperatures （TgS） between 225℃ and 256℃and excellent thermal stability up to 517-526℃ （thermal decomposition temperatures for 5% weight loss, Td, 5%） in nitrogen. The tensile strength and elongation at break of the polymers ranged from 63 MPa to 71 MPa and from 18% to 21%, respectively. The processability of the material was effectively improved by the introduction of biphenyl group into polymer backbone.

关键词： Phthalazinone Poly(aryl ether) Polycondensation processability Thermal stability

A multifunctional biomedical patch based on hyperbranched epoxy polymer and MXene

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Science China(Technological Sciences) 2021年第12期64卷 2744-2754页

作者： ZOU Yang JIN Xin ZHANG XiaoPing KONG XiaoLing ZHANG Qian XIE XianHua LIU ChangJun KE LinNan LIU WenGuang WANG Wei School of Materials Science and Engineering Tianjin Key Laboratory of Composite and Functional MaterialsTianjin UniversityTianjin 300350China Institutes for Food and Drug Control Beijing 100050China

Biomedical patches play fundamental roles in various applications such as wound closure and tissue *** hybrid patches integrating versatile properties will prominently improve the therapeutic effects in clinical ***,an epoxy network loading curcumin and Ti3 C2 TxMXenes were developed as a hybrid biomedical *** hybrid patch was basically prepared through an epoxy/thiol curing chemistry,and its topological structure can be destructed and rearranged as a vitrimer does due to the active transesterification at high *** resulted hybrid patch exhibits shape-morphing capability,multi-substrate adhesion,self-healing ability,and photothermal effects under 980 nm near infrared(NIR).Additionally,the asprepared hybrid patch possesses strong UV-shielding,excellent oxidation resistance(ROS scavenging efficiency was 89.3%in3 min),highly effective antibacterial vitality(more than 99%)against *** and ***,and good *** a proof of concept,the present multifunctional hybrid patch broadens the potential applications in the biomedical field.

关键词： biomedical patch MXenes photothermal processability antioxidation antibacterial activity

Preparation of Low-dielectric Permittivity Polyimide Resins with High Surface Activity from Chemically Bonded Hyperbranched Polysiloxane

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Chinese Journal of Polymer Science 2021年第9期39卷 1200-1210页

作者： Xiu-Ting Li Xiao-Meng Zhu Jie Dong Xin Zhao Qing-Hua Zhang State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and EngineeringDonghua UniversityShanghai 201620China

Thermosetting resin matrix is the key component of advaneed wave-tra nsparent composites,where low dielectric constant,excellent processability,high thermal stability,as well as good bonding ability are required for ***,we prepared a series of phenylethynyl terminated polyimide(PI)resins by grafting amine-functi onalized hyperbra nched polysiloxane(HBPSi)to PI chains during the in situ *** effects of HBPSi on the processability of oligomers,molecular packing,thermal stability,dielectric property and bonding ability to reinforce Kevlar fibers of the cured PI/HBPSi composite resins have been examined in *** dielectric constants of the cured composite resins were greatly reduced from 3.29 to 2.19 without compromising its processability and thermal ***,the 10 wt%HBPSi-containing PI resin demonstrated better bonding ability to reinforce fibers with the in terfacial shear strength(IFSS)of 37.64 MPa,compared with that of neat PI-6 matrix(27.34 MPa),and better adhesion to metal with the lap shear strength of 10.48 MPa,50%higher than that of neat resin PI-6(6.98 MPa).These resultant PI/HBPSi composite resins exhibit excellent comprehensive properties,indicating their great potential as low-dielectric constant resin matrix in radar radome.

关键词： Hyperbranched polysiloxane Polyimide resin Low dielectric constant processability Bonding ability

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浅议加工性理论和语言发展(英文)

思想战线 2010年第S1期36卷 304-306页

作者：李媛云南大学大学外语教学部

cognitive processing approaches in language learning explores how second language learners process linguistic information and how their ability to process L2 develops. Focusing on the processability Theory, this essay examines connections to L2 acquisition of cognitive skills. The links between the approach and L2 teaching is investigated, and teaching application in Chinese EFL contexts is also discussed.

关键词： SLA, SLT processability theory teaching application