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A Luminescent Dicyanodistyrylbenzene-based Liquid Crystal Polymer Network for Photochemically Patterned Photonic Composite Film

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Chinese Journal of Polymer Science 2018年第6期36卷 776-782页

作者： Zhe-Wei Zhang Jun-Tao Li Wan-Yuan Wei Jie Wei Jin-Bao Guo Key Laboratory of Carbon Fibers and Functional polymers Ministry of EducationBeijing Engineering Research Center for the Synthesis and Applications of Waterborne Polymers and College of Materials Science and EngineeringBeijing University of Chemical Technology

A novel photonic composite film based on a luminescent dicyanodistyrylbenzene-based liquid crystal polymer network（LCN） was fabricated by using a silica colloidal crystal as a template. The upper part of inverse opal structure and the luminescence characteristics of dicyanodistyrylbenzene-based moiety endowed the resulting bilayer photonic film with structural color arising from coherent Bragg reflection and fluorescence properties, respectively. A fluorescence enhancement phenomenon was observed in the photonic film due to the overlap between the reflection band and emission band of the fluorescent LCN. More importantly, the photo-induced irreversible Z/E photoisomerization of dicyanodistyrylbenzene-based moiety in the photonic film led to both a reflection spectral shift and an observable fluorescence variation. On the basis of this effective phototuning process, microscopic patterning of photonic film was developed under both fluorescence mode and reflection mode. The work demonstrated here provides a new route to construct photo-responsive photonic film.

关键词： Luminescent liquid crystal Polymer networks Photonic composite Photopatterning

Conventional Radical and RAFT Alternating Copolymerizations of Hydroxyalkyl Vinyl Ethers and Dialkyl Maleates

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Chinese Journal of Polymer Science 2023年第12期41卷 1856-1867,I0006页

作者： Yan-Xin Zhang Dong Chen Gao-Fei Hu Yu-Hong Ma Wan-Tai Yang beijing engineering research center of Syntheses and applications of waterborne polymers College of Materials Science and engineering Beijing University of Chemical TechnologyBeijing 100029China Analytical and Testing center Beijing University of Chemical TechnologyBeijing 100029China

The alternating copolymerization of hydroxyalkyl vinyl ethers and dialkyl maleates is investigated by conventional radical polymerization and reversible addition-fragmentation chain transfer polymerization(RAFT).The influence of comonomer structure,comonomer feeding ratios,and monomer concentrations on the copolymerization and the copolymer structure have been investigated systematically.With 2-hydroxyethyl vinyl ether(HEVE)and dimethyl maleates(DMM)as comonomers,a well-defined alternating copolymer is prepared with M_(n)=3400 and M_(w)/M_(n)=1.93 up to 71.6% monomer.The alternating sequential chain structure of the copolymers has been proved by both NMR and matrixassisted laser desorption/ionization time-of-flight mass spectrometry(MALDI-TOF MS).The experimental reactivity ratios and theoretical calculated highest occupied molecular orbital and the lowest unoccupied molecular orbital of vinyl ethers and alkyl maleates support that these monomer pairs have tendency to form alternating copolymers.With 2-cyanopropan-2-yl N-methyl-N-(pyridin-4-yl)carbamodithioate as the RAFT agent,the molecular weight of HEVE and DMM copolymer increases with the monomer conversion,demonstrating a controlled radical polymerization feature with well-controlled molecular weight and relatively narrower molecular weight distribution.With alternating copolymer of HEVE and DMM as macro-CTA(M_(n)=5200 and M_(w)/M_(n)=1.46),both the chain extension with HEVE and DMM(M_(n)=10400 and M_(w)/M_(n)=1.72)and block copolymerization with vinyl acetate have been successfully achieved(M_(n)=8500 and M_(w)/M_(n)=1.52).

关键词： Radical polymerization Vinyl ethers Maleates Alternating copolymer RAFT polymerization

Solidification of solvent additive for stable binary polymer solar cells with~19%efficiency

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Science China Materials 2023年第6期66卷 2523-2524页

作者： Hongru Chen Zhi-Guo Zhang Feng Gao State Key Laboratory of Chemical Resource engineering Beijing Engineering Research Center for the Synthesis and Applications of Waterborne PolymersBeijing University of Chemical TechnologyBeijing 100029China Department of Physics Biomolecular and organic electronicsChemistry and Biology(IFM)Linköping UniversityLinköping SE-58183Sweden

Polymer solar cells(PSCs)have garnered considerable attention due to their numerous benefits,such as solution-processability,and potential applications in flexible and semitransparent devices.With the development of photovoltaic materials and device structures,power conversion efficiencies(PCEs)of PSCs have exceeded 19%to date[1,2].Moreover,an ideal morphology for efficient and stable PSCs is extremely essential[3,4].

关键词： additive polymer benefits

Perylene-diimide derived organic photovoltaic materials

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Science China Chemistry 2022年第3期65卷 462-485页

作者： Ming Zhang Yang Bai Chenkai Sun Lingwei Xue Haiqiao Wang Zhi-Guo Zhang State Key Laboratory of Organic/Inorganic Composites Beijing Advanced Innovation Center for Soft Matter Science and EngineeringBeijing University of Chemical TechnologyBeijing 100029China College of Chemistry and Green Catalysis CenterZhengzhou UniversityZhengzhou 450001China School of Chemical and Environmental engineering Pingdingshan UniversityPingdingshan 467000China Beijing Engineering Research Center for the Synthesis and Applications of Waterborne Polymers Beijing University of Chemical TechnologyBeijing 100029China

In organic solar cells(OSCs), the material design on photovoltaic layers and interlayers has significantly contributed to the rapid progress of the device performance. Perylene-diimides(PDIs), owing to their distinct advantages of high electron affinity, high electron mobility and facial chemical modification, are being widely studied in OSCs, especially designed as photovoltaic acceptors and cathode interlayers. In this review, recent progress on those PDI derived photovoltaic materials is systematically summarized. Due to the different working mechanism in devices, the design strategies on modification of the parent PDI units towards their application as acceptors and cathode interlayers are explained. After disclosing the fundamental structure-property relationships, we disclose some common features in the design of those tailor-made PDI-based photovoltaic materials, and we also highlight the challenges and opportunities in improving their device performance in the future.

关键词： organic solar cells perylene-diimides photovoltaic acceptor cathode interlayer

Fabrication of Covalently Linked PAH/PVS Layer-by-layer Assembled Multilayers via a Post-photochemical Cross-linking Strategy

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Chemical research in Chinese Universities 2016年第3期32卷 493-498页

作者： JI Fanqin ZHANG Ymgwei GENG Yanling ZONG Yingxia WANG Lei State Key Laboratory of Inorganic synthesis and Applied Chemistry College of Chemistry and Molecular Engineering Qingdao University of Science and Technology Qingdao 266042 P. R. China Beijing Engineering Research Center for the Synthesis and Applications of Waterborne Polymers and beijing Laboratory of Biomedical Materials College of Materials Science and Engineering Beijing University of Chemical Technology Beijing 100029 P. R. China

A post-photochemical cross-linking strategy was successfully demonstrated to enhance the stability of polyelectrolyte poly（allylamine hydrochloride）（PAH）/poly（vinylsulfonic acid sodium salt）（PVS） multilayers. Con- ventional polyelectrolyte multilayers of PAH/PVS are usually fabricated through electrostatic layer-by-layer（LbL） assembly, resulting in poor stability, especially in basic solutions, which leads to the urgent demand for converting weak electrostatic interactions into covalent bonds to enhance the stability of the multilayers. This stability problem has been ultimately addressed by post-infiltrating a photosensitive cross-linking agent, 4,4＇-diazostilbene-2,2＇- disulfonie acid disodium salt（DAS）, into the LbL assembled films to initiate the photochemical reaction to cross-link the multilayers. The obviously improved stability of the photo-cross-linked multilayers was demonstrated through experiments with basic solution treatments. Compared to the complete decomposition of uncross-linked multilayers in basic solution, over 74.4% of the covalently cross-linked multilayers were retained under the same conditions, even after a longer duration of basic solution treatment.

关键词： Post-infiltration Photochemical cross-linking Poly（allylamine hydrochloride）/poly（vinylsulfonic acid sodium salt） Multilayer Layer-by-layer（LbL） assembly

Coupling N-doping and rich oxygen vacancies in mesoporous ZnMn_(2)O_(4)nanocages toward advanced aqueous zinc ion batteries

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Nano research 2022年第9期15卷 8118-8127页

作者： Can Huang Qiufan Wang Daohong Zhang Guozhen Shen Key Laboratory of Catalysis and Energy Materials Chemistry of Ministry of Education&Hubei Key Laboratory of Catalysis and Materials Science Hubei R&D Center of Hyperbranched Polymers Synthesis and ApplicationsSchool of Chemistry and Materials ScienceSouth-Central Minzu UniversityWuhan 430074China School of Integrated Circuits and Electronics Beijing Institute of TechnologyBeijing 100081China

The development of a high specific capacity and stable manganese(Mn)-based cathode material is very attractive for aqueous zinc-ion(Zn^(2+))batteries(ZIBs).However,the inherent low electrical conductivity and volume expansion challenges limit its stability improvement.Here,a mesoporous ZnMn_(2)O_(4)(ZMO)nanocage(N-ZMO)coupled with nitrogen doping and oxygen vacancies is prepared by defect engineering and rational structural design as a high-performance cathode material for rechargeable ZIBs.The oxygen vacancies enhance the electrical conductivity of the material and the nitrogen doping releases the strong electrostatic force of the material to maintain a higher structural stability.Interestingly,N-ZMO exhibits excellent ability of Zn^(2+)storage(225.4 mAh·g^(−1)at 0.3 A·g^(−1)),good rate,and stable cycling performance(88.4 mAh·g^(−1)after 1,000 cycles at 3 A·g^(−1)).Furthermore,a flexible quasi-solid-state device with high energy density(261.6 Wh·kg^(−1))is assembled,demonstrating long-lasting durability.We believe that the strategy in this study can provide a new approach for developing aqueous ZIBs.

关键词： nitrogen(N)-doping oxygen vacancies defect zinc-ion(Zn^(2+))storage flexible quasi-solid-state device

High-performance and multifunctional organic field-effect transistors

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中国化学快报:英文版 2023年第9期34卷 100-118页

作者： Yujie Zhao Wei Wang Zihan He Boyu Peng Chong-An Di Hanying Li MOE Key Laboratory of Macromolecular synthesis and Functionalization International Research Center for X PolymersDepartment of Polymer Science and EngineeringZhejiang UniversityHangzhou 310027China beijing National Laboratory for Molecular Sciences CAS Key Laboratory of Organic SolidsInstitute of ChemistryChinese Academy of SciencesBeijing 100190China School of Chemical Sciences University of Chinese Academy of SciencesBeijing 100049China

Organic field-effect transistors(OFETs)refer to field-effect transistors that use organic semiconductors as channel materials.Owing to the advantages of organic materials such as solution processability and intrinsic flexibility,OFETs are expected to be applicable in emergent technologies including wearable electronics and sensors,flexible displays,internet-of-things,neuromorphic computing,etc.Improving the electrical performance and developing multifunctionalities of OFETs are two major and closely relevant aspects for OFETs-related research.The former one aims for investigating the device physics and expanding the horizons of OFETs,while the later one is critical for leading OFETs into practical and emergent applications.The development in each of the two aspects would undoubtfully promote the other and bring more confidence for future development of OFETs.Hence,this review is divided into two parts that respectively summarize the recent progress in high-performance OFETs and multifunctional OFETs.

关键词： Organic filed-effect transistors Organic semiconductors High-performance Multifunctionality Organic electronics

Impact of Polymer Matrix on Polymer Mechanochromism from Excited State Intramolecular Proton Transfer

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Chinese Journal of Chemistry 2024年第6期42卷 611-616页

作者： Yu Wu Xin Cheng Huan Hu Shui Hu Zhimin Ma Zhiyong Ma beijing Advanced Innovation center for Soft Matter Science and engineering Beijing State Key Laboratory of Organic-Inorganic CompositesCollege of Chemical EngineeringBeijing University of Chemical TechnologyBeijing100029 China center of Advanced Elastomer Materials College of Materials Science and EngineeringBeijing University of Chemical TechnologyBeijing100029 China College of engineering Peking UniversityBeijing100871 China

Mechanochromic polymers based on non-covalent changes have attracted much attention recently.Herein,we report the impact of inter/intramolecular hydrogen bonds on polymer mechanochromism from the excited state intramolecular proton transfer (ESIPT) process.PhMz-NH2-OH and PhMz=2A are designed and obtained by simple and high-yield synthesis,and are connected into polyurethane and poly(methyl acrylate-co-2-ethylhexyl acrylate),respectively.In the initial state,the PhMz-NH2-OH@PU sample shows blue fluorescence from the excited enol form (E*) excitons,owing to intermolecular hydrogen bonds that interrupt the ESIPT reactions but the PhMz=2A@PMA-2-EA sample expresses cyan fluorescence belonging to the excited keto form (K*) emission,implying that the intramolecular hydrogen bonds matter.Furthermore,under stretching,external force can tune the emission of the PhMz=2A@PMA-2-EA sample from K* to E* state.Though external force can putatively still promote a bond rotation,ESIPT reactions remain equivalently interrupted in both the relaxed and stressed states in a hydrogen-bond donating environment.DFT calculation confirms the force-induced increase in dihedral angle for the transition of ESIPT-on/off.Thus,PhMz-NH2-OH@PU and PhMz=2A@PMA-2-EA showed disparate initial ESIPT states and further different responses/sensitivity to force.This study reports a novel and efficient strategy for enriching mechanochromic investigation and extending the applications of ESIPT reactions.

关键词： Polymer mechanochromism Excited state intramolecular proton transfer Hydrogen bonding Supramolecular chemistry Elastomers

Highly Thermally Conductive and Structurally Ultra‑Stable Graphitic Films with Seamless Heterointerfaces for Extreme Thermal Management

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Nano-Micro Letters 2024年第3期16卷 383-397页

作者： Peijuan Zhang Yuanyuan Hao Hang Shi Jiahao Lu Yingjun Liu Xin Ming Ya Wang Wenzhang Fang Yuxing Xia Yance Chen Peng Li Ziqiu Wang Qingyun Su Weidong Lv Ji Zhou Ying Zhang Haiwen Lai Weiwei Gao Zhen Xu Chao Gao MOE Key Laboratory of Macromolecular synthesis and Functionalization Department of Polymer Science and EngineeringKey Laboratory of Adsorption and Separation Materials and Technologies of Zhejiang ProvinceZhejiang University38 Zheda RoadHangzhou 310027People’s Republic of China Shanxi-Zheda Institute of Advanced Materials and Chemical engineering Taiyuan 030032People’s Republic of China beijing Spacecrafts Manufacturing Co. LtdBeijing Friendship Road 104Haidian DistrictBeijing 100094People’s Republic of China beijing Institute of Space Mechanics and Electricity Beijing Friendship Road 104Haidian DistrictBeijing 100094People’s Republic of China China Academy of Aerospace Aerodynamics Beijing 100074People’s Republic of China Hangzhou Gaoxi Technol Co. LtdHangzhou 311113People’s Republic of China International research center for X polymers International CampusZhejiang UniversityHaining 314400People’s Republic of China

Highly thermally conductive graphitic film(GF)materials have become a competitive solution for the thermal management of high-power electronic devices.However,their catastrophic structural failure under extreme alternating thermal/cold shock poses a significant challenge to reliability and safety.Here,we present the first investigation into the structural failure mechanism of GF during cyclic liquid nitrogen shocks(LNS),which reveals a bubbling process characterized by“permeation-diffusion-deformation”phenomenon.To overcome this long-standing structural weakness,a novel metal-nanoarmor strategy is proposed to construct a Cu-modified graphitic film(GF@Cu)with seamless heterointerface.This well-designed interface ensures superior structural stability for GF@Cu after hundreds of LNS cycles from 77 to 300 K.Moreover,GF@Cu maintains high thermal conductivity up to 1088 W m^(−1)K^(−1)with degradation of less than 5%even after 150 LNS cycles,superior to that of pure GF(50%degradation).Our work not only offers an opportunity to improve the robustness of graphitic films by the rational structural design but also facilitates the applications of thermally conductive carbon-based materials for future extreme thermal management in complex aerospace electronics.

关键词： Highly thermally conductive Structurally ultra-stable Graphitic film Extreme thermal management Liquid nitrogen bubbling