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Upcyclable thermosetting photopolymer containing degradable sulfite bonds for sustainable 3D printing

science China materials 2024年第12期67卷 4049-4058页

作者： Beitao Liu Cijian Zhang Jiahui Li Guangsheng Zhang Xigao Jian Zhihuan Weng State Key Laboratory of Fine Chemicals Frontiers Science Center for Smart MaterialsLiaoning Technology Innovation Center of High Performance Resin MaterialsDepartment of Polymer Science&EngineeringDalian University of TechnologyDalian 116024China

The advancement of photo-curing three-dimensional(3D)printing technology has significantly enhanced the capabilities of advanced manufacturing across various ***,the robust cross-linking network of photopolymers limits its application in information encryption and exacerbates environmental *** this study,a degradable thermosetting photopolymer platform for information encryption was proposed by incorporating sulfite bonds into the polymer *** to the autocatalytic behavior of sulfite bonds during hydrolysis under acidic conditions,the photopolymer can achieve complete degradation at 50℃ within 45 *** on the degradability of the developed photopolymers,a highly secure degradation-UV dual information encryption system has been established using photo-curing-based 3D printing ***,the degradation products of these photopolymers,generated during the information decryption process,can be utilized to prepare high-performance solar thermoelectric generators with a power density of 325.7µW cm^(−2)(under one sun)after a simple one-step *** work not only inspires the development of multiple information encryption methods based on 3D printing but also provides a practical solution to address environmental challenges associated with plastic pollution.

关键词： sustainable 3D printing thermosetting photopolymer upcycling information encryption solar thermoelectric generator

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Mechanoluminescent Fibers for Visualizing Motion Sensing

Mechanoluminescent Fibers for Visualizing Motion Sensing

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2024 International Conference on the Challenges, Opportunities, Innovations and Applications in Electronic Textiles, E-Textiles 2024

作者： Yang, Weifeng Wang, Hongzhi Menon, Carlo ETH Zürich Biomedical and Mobile Health Technology Laboratory Department of Health Science and Technology Zürich Switzerland State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and Engineering Donghua University Shanghai China

ISBN: (纸本)9783000804298

Motion monitoring using electronic fibers plays a pivotal role in personal healthcare, disease detection, and diagnosis. While existing studies primarily focus on enhancing the accuracy and sensitivity of electrical sensing signals, these signals remain invisible to the naked eye, hindering intuitive user experiences. Here, we propose a novel luminous fiber based on the mechanoluminescence (ML) effect. This fiber enables real-time visual sensing of external mechanical forces without relying on additional electronic components such as batteries or chips. This ML fiber features a simple structure and good stability, which consists of a core layer of ZnS:Cu2+ composite elastic material and a sheath layer of silicone rubber elastomer. Notably, within a tensile strain range of 30%, the ML fiber emits visible green light at 520 nm, with light intensity positively correlated to tensile acceleration. Our design strategy presents a viable solution for future motion management applications. © 2024 Fraunhofer IZM.

关键词： Silicones

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‘Catalyst + X’ strategies for transition metal-catalyzed olefin-polar monomer copolymerization

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Trends in Chemistry 2023年第2期5卷 147-159页

作者： Tan, Chen Chen, Min Chen, Changle Institutes of Physical Science and Information Technology Key Laboratory of Structure and Functional Regulation of Hybrid Materials of Ministry of Education Key Laboratory of Environment-Friendly Polymeric Materials of Anhui Province Anhui University Anhui Hefei230601 China CAS Key Laboratory of Soft Matter Chemistry Department of Polymer Science and Engineering University of Science and Technology of China Hefei230026 China

Transition metal-catalyzed olefin-polar monomer copolymerization holds great potential for the synthesis of polar group-functionalized polyolefin materials. The dominant approach to developing a new catalytic system is trial-and-error, which is challenging and time-consuming due to the poisoning reactions of polar groups toward the metal center. Recently, ‘catalyst + X’ strategies based on the interactions between the catalyst and other components in the copolymerization system have emerged. Different ‘X’ factors, including the solid support(s), comonomer(s), chemical agent(s), and light, have been demonstrated to influence the catalyst reactivity toward polar comonomers, olefin-comonomer copolymerization process, copolymer microstructure, and resulting copolymer material properties. This short review summarizes selected examples of these ‘catalyst + X’ strategies and discusses future perspectives. © 2022 Elsevier Inc.

关键词： Catalysts

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Intense Intramolecular Charge Transfer Endows Cyanated polymer with Broad Absorption,Intensified Light-Harvesting,Long-Lived Exciton,and Superior Photovoltaic Property

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CCS Chemistry 2024年第9期6卷 2318-2332页

作者： Jinming Chen Huijuan Wang Songmin Mo Hui Chen Xinyu He Mingbin Su Dongyan Li Yonghong Xiao Zhiqi Wang Fanwei Ye Mingde Li Li Dang Xiao-Chun Huang Chang-Zhi Li Feng He Qinghe Wu Key Laboratory for Preparation and Application of Ordered Structural Materials of Guangdong Department of ChemistryShantou UniversityShantou 515063 Department of Chemistry Shenzhen Grubbs InstituteSouthern University of Science and TechnologyShenzhen 518055 Department of Polymer Science and Engineering Zhejiang UniversityHangzhou 310027 Chemistry and Chemical Engineering Guangdong Laboratory Shantou 515063 Guangdong Provincial Key Laboratory of Catalysis Southern University of Science and TechnologyShenzhen 518055

The donor–acceptor(D–A)copolymers,which exhibit wide broad absorption and intensified light-harvesting,are highly captivating for applications in solar conversion and ***,designing a polymer structure that can achieve these photophysical properties simultaneously remains a ***,we report two novel cyanated units 4-cyanobenzo[1,2-b:6,5-b′:3,4-c″]trithiophene(CBT)and 4,6-dicyanobenzo[1,2-b:6,5-b′:3,4-c″]trithiophene(C2BT)and their corresponding polymers,PCBT and *** interestingly,the PC2BT exhibited a broad absorption band with full width at half maxima(FWHM)of its absorption spectra,almost twice wider than PCBT and benchmark polymers PM6 and ***,the PC2BT demonstrated intensified light-harvesting and long-lived *** in-depth investigation unveiled that the presence of dicyano substitutions induced a strong intramolecular charge transfer(ICT),which,in turn,resulted in the formation of favorable photophysical ***,PC2BT-based polymer solar cells(PSCs)exhibited an efficiency of 18.06%,which was a record-setting efficiency for cyanated *** study suggests an efficient strategy for enhancing ICT to design polymers toward favorable photophysical properties and excellent photovoltaic performance.

关键词： intramolecular charge transfer broad absorption band dicyanobenzotrithiophene cyanated polymer polymer solar cell

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Steering S-scheme charge transfer via interfacial dipoles induced by amine-containing polyelectrolytes

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science China Chemistry 2023年第7期66卷 2098-2108页

作者： Tao Li Chuang Feng Biquan Xiong Xuhui Zhu Zhicai He Wai-Yeung Wong Institute of Polymer Optoelectronic Materials and Devices State Key Laboratory of Luminescent Materials and DevicesSchool of Material Science and EngineeringSouth China University of TechnologyGuangzhou 510640China Department of Applied Biology&Chemical Technology and Research Institute for Smart Energy The Hong Kong Polytechnic UniversityHung HomHong KongChina

The lack of a robust interfacial driving source over multicomponent photocatalysts is an essential contributor to the sluggish spatial charge transfer across the heterointerface and severe carrier recombination,thereby rendering maneuvering charge transfer of composite materials a thorny ***,we demonstrate an electric dipole moment-driven charge transfer photosystem utilizing amine-containing polyfluorene polyelectrolyte(i.e.,PFN)and inorganic semiconductor matrices(i.e.,WO_(3))as the building blocks to direct the interfacial charge transfer,effectively targeting the photoexcited charge carriers to the active *** results and theoretical simulations reveal that the electronic coupling interaction between the pendant electron-rich amine groups along the PFN backbone and WO_(3)surface enables the nonuniform charge distribution at the interface over the WO_(3)@PFN heterojunction,which ultimately fosters the formation of interfacial dipoles oriented from conjugated macromolecular backbone of PFN to the surface of WO_(3)*** interfacial dipoles with excellent charge transfer kinetics spontaneously activate the unidirectional and accelerated S-scheme charge motion from the WO_(3)framework to the conjugated chain of PFN due to the suitable band offsets at the interface,thus endowing WO_(3)@PFN heterostructures with a significantly enhanced net efficiency of *** findings would provide some insights into the design of advanced heterojunction photocatalysts for solar energy conversion as well as the study of the working mechanism of polyelectrolyte interlayers in optoelectronic devices.

关键词： photocatalysis heterojunction interfacial dipole polyelectrolyte S-scheme

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Study on the Co-crystal Transition Process and Mechanism of CL-20 and HMX in Propellant Formulation 4

Study on the Co-crystal Transition Process and Mechanism of ...

引用

4th International Conference on Defence technology, ICDT 2024

作者： Zou, Pangangjing Li, Shichun Huang, Shiliang Zhang, Haobin Liu, Yu Li, Liangbin Xu, Jinjiang CAS Key Laboratory of Soft Matter Chemistry Department of Polymer Science and Engineering University of Science and Technology of China Anhui 230026 China Institute of Chemical Materials China Academy of Engineering Physics Mianyang621900 China

The integration of CL-20 into solid propellants to enhance their energy levels has emerged as a focal point in the research of high-energy solid propellants and the use of CL-20 as a partial substitute for traditional oxidizers in propellant formulations has emerged as a viable method for propellant modification. However, research indicates that the microstructure and crystal form of CL-20 and HMX may undergo changes due to external stimuli and energy induction, resulting in significant deterioration of the propellant's mechanical and combustion properties, as well as its safety. We were surprised to find that CL-20 and HMX can form co-crystal not only in the nitric ester plasticizer like DOS but also in some specific binders, such as GAP and HTPE, and revealed that the solvent's capacity to dissolve two explosives is the key determinant in the formation of co-crystal. © 2024 Institute of Physics Publishing. All rights reserved.

关键词： HMX

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Host defense peptide-mimicking peptide polymer-based antibacterial hydrogel enables efficient healing of MRSA-infected wounds

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science China Chemistry 2023年第6期66卷 1824-1833页

作者： Zhongqian Qiao Wenjing Zhang Yueming Wu Weinan Jiang Ning Shao Jiayang Xie Guixue Xia Qimeng Chen Zhefeng Liu Jingcheng Zou Jiawei Gu Shifang Luan Haodong Lin Runhui Liu State Key Laboratory of Bioreactor Engineering East China University of Science and TechnologyShanghai 200237China Key Laboratory for Ultrafine Materials of Ministry of Education Frontiers Science Center for Materiobiology and Dynamic ChemistryShanghai Frontiers Science Center of Optogenetic Techniques for Cell MetabolismResearch Center for Biomedical Materials of Ministry of EducationSchool of Materials Science and EngineeringEast China University of Science and TechnologyShanghai 200237China Department of Orthopedic Surgery Shanghai General HospitalShanghai Jiao Tong University School of MedicineShanghai 200080China State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China

Wound infections are a compelling health issue caused by the invasion and proliferation of pathogens in wound *** hydrogels are widely used to achieve anti-infectious wound ***,due to the quick emergence of drugresistant bacteria,such as methicillin-resistant Staphylococcus aureus(MRSA),wound infection has been a formidable challenge to human *** address MRSA-infected wounds,an antibacterial peptide polymer-loaded hyaluronic acid(HA)hydrogel(Gel-HA@P)is *** peptide polymer is designed to mimic host defense peptides as the antibiotic alternative showing potent antibacterial activity,low susceptibility to drug resistance and good stability against *** is biocompatible and biodegradable hydrogel substrate as a primary constituent of the extracellular matrix and suitable for cell migration and wound ***-HA@P shows potent activity against MRSA in vitro and in vivo,low toxicity during the treatment and promotes the wound healing in *** design has proven to be an effective and antibiotic-free strategy to enable the healing of MRSA-infected wounds.

关键词： peptide polymer wound healing MRSA drug-resistance host defense peptide

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Inverse Hall-Petch effect in nanocrystalline ice predicted by machine-learned coarse-grained molecular simulations

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Journal of Micromechanics and Molecular Physics 2023年第1期8卷 1-10页

作者： Chen, Guang Tao, Lei Kröger, Martin Li, Ying Department of Mechanical Engineering University of Connecticut Storrs 06269 CT United States Department of Materials Polymer Physics Eth Zürich Zürich CH-8093 Switzerland Department of Mechanical Engineering Institute of Materials Science University of Connecticut Storrs 06269 CT United States Polymer Program Institute of Materials Science University of Connecticut Storrs 06269 CT United States

We study the grain-size effect on mechanical behaviors of polycrystalline ice at nanoscale through large-scale molecular dynamics simulations, enabled by an accurate and efficient machine-learned coarse-grained water model [H. Chan, M. J. Cherukara, B. Narayanan, T. D. Loeffler, C. Benmore, S. K. Gray and S. K. Sankaranarayanan. Machine learning coarse grained models for water. Nature Communications 10(1), p. 379, 2019]. Polycrystalline ice systems with different grain sizes in the range of 5∼30 nm are systematically investigated through uniaxial tensile tests. Simulation results reveal that Young's modulus and yield strength increase as the grain size increases, leading to an inverse Hall-Petch effect in nanocrystalline ice. Such an observation is significantly different from the conventional Hall-Petch effect in polycrystalline ice observed by experiments at millimeter scale. The deformation behavior suggests that grain boundaries (GBs), rather than grain interiors, play the active role in accommodating external loading in nanocrystalline ice. Further void analysis of nanocrystalline ice during deformation reveals that nanocrack initiates and propagates along GBs and eventually leads to failure of systems with larger grain sizes (≥20nm), yielding a sudden drop in the stress-strain curve. While for systems with smaller grain sizes (≤15nm), only extensive plastic deformation is presented without significant void growth. Our simulation results demonstrate that the GB sliding is the governing mechanism for the inverse Hall-Petch effect observed in nanocrystalline ice. © 2023 World Scientific Publishing Company.

关键词： grain boundary inverse Hall-Petch effect molecular dynamics simulation Polycrystalline ice water model

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Super-Tough PLA-Based Blends with Excellent Stiffness and Greatly Improved Thermal Resistance via Interphase engineering (vol 15, pg 22445, 2023)

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ACS APPLIED materials & INTERFACES 2024年第13期16卷 17065-17066页

作者： Mazidi, Majid Mehrabi Sharifi, Hossein Aghjeh, Mir Karim Razavi Zare, Leila Khonakdar, Hossein Ali Reuter, Uta Faculty of Polymer Engineering Sahand University of Technology Tabriz 51335-1996 Iran Department of Materials Science and Engineering Sharif University of Technology Tehran *** Iran Faculty of Polymer and Chemistry Sciences Islamic Azad University Fasa *** Iran Department of Polymer Processing Iran Polymer and Petrochemical Institute *** Tehran Iran Leibniz-Institut fur Polymerforschung Dresden e.V. 01069 Dresden Germany

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Highly Penetrable Silicone Emulsion for Water-Repellent Concrete with Reserved Surface Recoatability

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Journal of Wuhan University of technology(materials science) 2022年第1期37卷 58-65页

作者： ZHANG Qian ZHANG Guozheng YOU Jun ZHANG Qunchao TAO Haizheng State Key Laboratory of Silicate Materials for Architectures(Wuhan University of Technology) Wuhan 430070China Hubei Key Laboratory of Polymer Materials Department of Materials Science and EngineeringHubei UniversityWuhan 430062China

Highly stable and permeable silicone emulsions were prepared by encapsulating N-octyl triethoaysilane microdroplets into micelles of NH_(2)-PDMS/SiO_(2).The conversion of siloxane to sub-1μm emulsions,on one hand,endows the concrete with a highly hydrophobic internal ***,its outside surface maintains relatively high surface energy,which is beneficial for the post-coating of other *** a result,the coated concreted can simultaneously acquire water repellency and low *** utilization of water-dispersed silicone emulsions,on the other hand,is beneficial for the environmental ***,this work offered a green procedure for the comprehensive protection of concrete.

关键词： concrete silicone waterproof recoatability emulsions

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