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Design and synthesis of thiol-terminated imidothioether oligomer as thermally latent hardener and modifier for high-performance epoxy/thiol thermosets

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Science China Chemistry 2024年第2期67卷 632-641页

作者： Xing Liu Jianjun Zhou Shumei Liu Jianqing Zhao School of Materials Science and Engineering South China University of TechnologyGuangzhou510640China Key Lab Guangdong High Property&Functional Polymer Materials Key Laboratory of Polymer Processing EngineeringMinistry of EducationGuangzhou510640China

Conventional base-catalyzed epoxy/aliphatic thiol systems have a poor storage stability,and are impossible to be one-pot systems.A widely accepted solution is to use the latent catalysts,which are usually insoluble anionic initiators sensitive to impurities and moisture,and have many limitations in practical *** this work,a soluble thiol-terminated imidothioether oligomer(TPI) was synthesized and used as a latent hardener and modifier to prepare one-pot epoxy/thiol systems without the latent *** latent behavior and curing mechanism of epoxy systems(EP/TPI series),consisted of bisphenol A diglycidyl ether(DGEBA),pentaerythritol tetrakis(mercaptoacetate)(PETMP) and TPI,were *** thiol exchange reaction between TPI and PETMP preceded the curing reaction of DGEBA,and produced aromatic thiols,which were unreactive at ambient conditions and reacted with DGEBA to form the thermosets at temperatures above 130 ℃.At the loading of 24.4 wt%TPI,the epoxy system(EP/TPI-3) had a shelf life of 13 days and was completely cured within 20 min at 180 ℃.Meanwhile,the catalyst-free curing process of EP/TPI-3 system was insensitive to impurities and ***,the thermal and mechanical properties of EP/TPI-3 thermoset were simultaneously improved,thereinto,the glass transition temperature,Young's modulus and ultimate tensile strength were increased by 16.7 ℃,12.9%,and 13.6%,respectively,compared with those of the commercial DGEBA/PETMP *** work shows that TPI has the potential to be a powerful alternative to commercial latent catalysts,and EP/TPI thermosets with high performance have broad application prospects.

关键词： thiol-terminated imidothioether oligomer epoxy systems thiol exchange reaction thermal latency high performance

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Cyclic Pulsating Pressure Enhanced Segregating Structuration of Ultra-High Molecular Weight Polyethylene/Graphene Composites as High-performance Light-Weight EMI Shields

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Chinese Journal of polymer Science 2024年第7期42卷 958-967,I0008页

作者： Yun-Zhi Huang Xiao-Xiao Liu Lan-Wei Li Guang-Ming Huang Zhao-Xia Huang Jin-Ping Qu National Engineering Research Center of Novel Equipment for Polymer Processing Key Laboratory of Polymer Processing EngineeringMinistry of EducationGuangdong Provincial Key Laboratory of Technique and Equipment for Macromolecular Advanced ManufacturingSchool of Mechanical and Automotive EngineeringSouth China University of TechnologyGuangzhou 510641China School of Advanced Manufacturing Technology Guangdong Mechanical&Electrical PolytechnicGuangzhou 510550China

Currently,the enhancement in electromagnetic interference(EMI)performance of polymeric composite generally relies on either improving electrical conductivity(σ)for stronger electromagnetic(EM)reflections or tailoring structure for higher EM ***,we proposed a novel technique called cyclic pulsating pressure enhanced segregating structuration(CPP-SS),which can reinforce these two factors *** structural information was supplied by optical microscopy(OM)and scanning electron microscopy(SEM),both of which confirmed the formation and evolution of segregate structured ultra-high molecular weight polyethylene(UHMWPE)/graphene ***,the result showed that CPP-SS can significantly improve theσof ***,advanced specific EMI shielding efficiency of 31.1 d B/mm was achieved for UHMWPE/graphene composite at 1-mm thickness and a low graphene loading of 5 wt%.Meanwhile,it also confirmed that the intrinsic disadvantage of poor mechanical properties of conventional segregated structure composites can be *** work is believed to provide a fundamental understanding of the structural and performance evolutions of segregated structured composites prepared under CPPSS,and to bring us a simple and efficient approach for fabricating high-performance,strong and light-weight polymeric EMI shields.

关键词： Cyclic pulsating pressure Segregated structure Ultra-high molecular weight polyethylene Graphene Electromagnetic interface

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Efficient blocked symmetric compressed sparse column method for finite element analysis

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Frontiers of Mechanical engineering 2025年第1期20卷 87-104页

作者： Yingjun WANG Shijie LUO Jinyu GU Yuanfang ZHANG National Engineering Research Center of Novel Equipment for Polymer Processing The Key Laboratory of Polymer Processing Engineering of the Ministry of EducationGuangdong Provincial Key Laboratory of Technique and Equipment for Macromolecular Advanced ManufacturingSouth China University of TechnologyGuangzhou 510641China Shien-Ming Wu School of Intelligent Engineering South China University of TechnologyGuangzhou 511442China

In finite element analysis(FEA),optimizing the storage requirements of the global stiffness matrix and enhancing the computational efficiency of solving finite element equations are pivotal *** address these goals,we present a novel method for compressing the storage of the global stiffness matrix,aimed at minimizing memory consumption and enhancing FEA *** method leverages the block symmetry of the global stiffness matrix,hence named the blocked symmetric compressed sparse column(BSCSC)*** also detail the implementation scheme of the BSCSC method and the corresponding finite element equation solution *** approach optimizes only the global stiffness matrix index,thereby reducing memory requirements without compromising FEA computational *** then demonstrate the efficiency and memory savings of the BSCSC method in FEA using 2D and 3D cantilever beams as *** addition,we employ the BSCSC method to an engine connecting rod model to showcase its superiority in solving complex engineering ***,we extend the BSCSC method to isogeometric analysis and validate its scalability through two examples,achieving up to 66.13%memory reduction and up to 72.06%decrease in total computation time compared to the traditional compressed sparse column method.

关键词： finite element analysis global stiffness matrix blocked symmetric property memory reduction isogeometric analysis

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Comparative Study of Intrachain versus Interchain Cross-linking on the Mechanical,Thermal and Dielectric Properties of Low-k Polyimide

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Chinese Journal of polymer Science 2024年第11期42卷 1824-1834,I0014页

作者： Wan-Jing Zhao Yi-Zhang Tong Pei-Pei Zeng Yang-Sheng Zhou Xian-Wu Cao Wei Wu National Engineering Research Center of Novel Equipment for Polymer Processing Key Laboratory of Polymer Processing Engineering of Ministry of EducationGuangdong Provincial Key Laboratory of Technique and Equipment for Macromolecular Advanced ManufacturingSchool of Mechanical and Automotive EngineeringSouth China University of TechnologyGuangzhou510640China Engineering Center for Superlubricity Jihua LaboratoryFoshan528200China Guangdong Provincial Key Laboratory of Distributed Energy Systems Guangdong Provincial Engineering Research Center of Distributed Energy SystemsDongguan University of TechnologyDongguan523808China

Polyimide(PI)is widely used in high-frequency communication technology due to its exceptional comprehensive ***,traditional PI has a relatively elevated dielectric constant and dielectric ***,the different cross-linked structures were introduced in PI matrix and conducted a detailed discussion on the influence of cross-linking agent content and cross-linking structure type on the overall performance of PI *** comparison to the dielectric constant of 2.9 of neat PI,PI with an interchain cross-linking structure containing 2 wt%1,3,5-tris(4-aminophenyl)benzene(TAPB)(interchain-PI-2)exhibited the reduced dielectric constant of 2.55 at 1 *** PI films with intrachain crosslinking structure containing 2 wt%TAPB(intrachain-PI-2)exhibited the lowest dielectric constant of 2.35 and the minimum dielectric loss of0.0075 at 1 *** was due to the more entanglement junctions of intrachain-PI resulting in decreased carrier *** thermal expansion coefficients of both interchain-PI and intrachain-PI films were effectively ***,in contrast to interchain-PI films,the intrachain-PI films maintained colorlessness and transparency as the cross-linking agent content *** work compared the effects of two different cross-linked structures on the performance of PI films and provided a feasible way to obtain low-k PI films with excellent comprehensive performance for 5G applications.

关键词： Interchain cross-linking Intrachain cross-linking Polyimide Low dielectric

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polymer composites designed with 3D fibrous CNT“tracks”achieving excellent thermal conductivity and electromagnetic interference shielding efficiency

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Nano Research 2023年第8期16卷 11411-11421页

作者： Gui Yang Liangchun Zhou Mingjie Wang Tiantian Xiang Duo Pan Jingzhan Zhu Fengmei Su Youxin Ji Chuntai Liu Changyu Shen National Engineering Research Center for Advanced Polymer Processing Technology The Key Laboratory of Material Processing and Mold of Ministry of EducationCollege of Materials Science and EngineeringZhengzhou UniversityZhengzhou 450002China

The rapid improvement in the running speed,transmission efficiency,and power density of miniaturized devices means that multifunctional flexible composites with excellent thermal management capability and high electromagnetic interference(EMI)shielding performance are urgently ***,inspired by the fibrous pathways of the human nervous system,a“core–sheath”fibers structured strategy was proposed to prepare thermoplastic polyurethane/polydopamine/carbon nanotube(TPU/PDA/CNT)composites film with thermal management capability and EMI shielding ***,TPU@PDA@CNT fibers with CNT shell were prepared by a facile polydopamine-assisted coating on electrospun TPU ***,TPU/PDA/CNT composites with three-dimensional(3D)fibrous CNT“tracks”are obtained by a hot-pressing process,where CNTs distributed on adjacent fibers are compactly *** fabricated TPU/PDA/CNT composites exhibit a high in-plane thermal conductivity(TC)of 9.6 W/(m·K)at low CNT loading of 7.6 wt.%.In addition,it also presents excellent mechanical properties and excellent EMI shielding effectiveness of 48.3 dB as well as multi-source driven thermal management ***,this study provides a simple yet scalable technique to prepare composites with advanced thermal management and EMI shielding performance to develop new-generation wireless communication technologies and portable intelligent electronic devices.

关键词： composites three-dimensional(3D)fibrous carbon nanotube(CNT)“tracks” in-plane thermal conductivity(TC) electromagnetic interference(EMI)shielding multi-source driven thermal management

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Fabrication of Polytetrafluoroethylene Aerogels with Excellent Sound Absorption and Thermal Insulation

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Chinese Journal of polymer Science 2025年第5期43卷 808-818页

作者： Cong-Cong Li You-Lei Tu Shao-Yun Guo Jia-Bin Shen State Key Laboratory of Polymer Materials Engineering Polymer Research Institute of Sichuan UniversityNational Engineering Laboratory of Eco-Friendly Polymeric Materials(Sichuan)Sichuan Provincial Engineering Laboratory of Plastic/Rubber Complex Processing TechnologyChengdu610065China Department of Mechanics College of Architecture&EnvironmentSichuan UniversityChengdu610065China

As the application scenarios of aerogels expand,higher requirements are put forward for the materials used to prepare *** to the unique chemical structure,polytetrafluoroethylene(PTFE)has excellent properties such as high-temperature resistance,hydrophobicity,and chemical ***,the PTFE aerogels are difficult to be molded due to the weak interaction between resin *** this work,poly(ethylene oxide)(PEO)was selected as the carrier to assist the PTFE aerogels *** pure PTFE aerogels were prepared by homogeneously mixing PTFE aqueous dispersion and PEO,freeze-drying,and high-temperature *** the mass fraction of PTFE and PEO were appropriate,the porosity of PTFE aerogels exceeded 90%and had a hierarchical honeycomb *** showed that the PTFE aerogels not only had excellent hydrophobicity but also possessed superior acoustic insulation,mechanical strength,thermal insulation,and heat resistance ***,the water contact angle is about 140°.The noise reduction coefficient is 0.34 and the average sound absorption coefficient is greater than 88%in the frequency range of 2000-6400 ***,the thermal conductivity in the air is about 0.045 W/(m·K),and the initial thermal decomposition temperature is 450℃.More importantly,the PTFE aerogels had excellent temperature and corrosion *** after extremely thermal and chemical treatment,they remained unchanged porous structure as well as acoustic and thermal insulation properties,which exhibits great potential for application in many harsh environments.

关键词： Polytetrafluoroethylene Fluoropolymer Aerogel Acoustic absorption Thermal insulation

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High-performance MXene films by sequential bridging

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National Science Review 2024年第12期11卷 65-66页

作者： Xianhu Liu Jingna Zhang Chuntai Liu Changyu Shen State Key Laboratory of Structural Analysis Optimization and CAE Software for Industrial Equipment National Engineering Research Center for Advanced Polymer Processing TechnologyZhengzhou University

MXenes—a kind of two-dimensional(2D) carbides, nitrides, oxycarbides and carbonitrides of early transition metals—have high mechanical and electrical properties and excellent photothermal conversion, biocompatibilit... 详细信息

关键词： mxene high bridging films performance sequential

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Ag anchored mesoporous carbon hollow sphere in Cellulose nanofibers/MXene composite films for high-performance electromagnetic interference shielding

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Nano Materials Science 2025年第1期7卷 65-73页

作者： Wenting Tao Wenqin Shao Meng Ma Si Chen Yanqin Shi Huiwen He Yulu Zhu Xu Wang College of Materials Science and Engineering Zhejiang Key Laboratory of Plastic Modification and Processing TechnologyZhejiang University of TechnologyHangzhou310014PR China State Key Laboratory of Polymer Materials Engineering Sichuan UniversityChengdu610065PR China

The increasingly serious electromagnetic(EM)radiation and related pollution effects have gradually attracted people's attention in the information ***,it's crucial to develop adaptive shielding materials with minimum EM waves(EMW)*** this paper,Ag nanoparticles loaded mesoporous carbon hollow spheres(MCHS@Ag)were synthesized by chemical reduction method,and cellulose nanofibers(CNF)/MXene/MCHS@Ag homogeneous composites were *** total EM interference shielding efficiency(SET)of CNF/MXene/MCHS@Ag composite film was 32.83 dB(at 12.4 GHz),and the absorption effectiveness(SEA)was improved to 26.6 dB,which was 63.1%and 195.5%higher than that of CNF/MXene/MCHS composite *** low dielectric property of MCHS effectively optimized the impedance matching between the composites and *** hollow porous structure prolonged the transmission path of EMW and increased the absorption loss of the *** the same time,Ag nanoparticles located the MCHS were helpful to construct the internal conductive path overcoming the damage of the conductive property caused by the low dielectric of *** research adopts a straightforward method to construct a lightweight,pliable,and mesoporous composites for EMI shielding,which serves a crucial role in the current era of severe EM pollution.

关键词： EMI shielding Porous structure Low reflection Film Ag anchored

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Multi-scale structure engineering of covalent organic framework for electrochemical charge storage

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SusMat 2024年第1期4卷 4-33页

作者： Xiaofang Zhang Fangling Li Shuangqiao Yang Baiqi Song Richu Luo Rui Xiong Weilin Xu State Key Laboratory of New Textile Materials and Advanced Processing Technologies Wuhan Textile UniversityWuhanChina State Key Laboratory of Polymer Materials Engineering Polymer Research Institute at Sichuan UniversityChengduChina

Covalent organic frameworks(COFs),which are constructed by linking organic building blocks via dynamic covalent bonds,are newly emerged and burgeoning crystalline porous copolymers with features including programmable topological architecture,pre-designable periodic skeleton,well-defined micro-/meso-pore,large specific surface area,and customizable electroactive *** benefits make COFs as promising candidates for advanced electrochemical energy ***,for now,structure engineering of COFs from multiscale aspects has been conducted to enable optimal overall electrochemical performance in terms of structure durability,electrical conductivity,redox activity,and charge *** this review,we give a fundamental and insightful study on the correlations between multi-scale structure engineering and eventual electrochemical properties of COFs,started with introducing their basic chemistries and charge storage *** careful discussion on the significant achievements in structure engineering of COFs from linkages,redox sites,polygon skeleton,crystal nanostructures,and composite microstructures,and further their effects on the electrochemical behavior of COFs are ***,the timely cutting-edge perspectives and in-depth insights into COFbased electrodematerials to rationally screen their electrochemical behaviors for addressing future challenges and implementing electrochemical energy storage applications are proposed.

关键词： covalent organic frameworks electrochemical energy storage multi-scale structure engineering structure-performance correlation

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Ultrasensitive electrospinning fibrous strain sensor with synergistic conductive network for human motion monitoring and human-computer interaction

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材料科学技术（英文版） 2025年第10期213卷 213-222页

作者： Jingwen Wang Shun Liu Zhaoyang Chen Taoyu Shen Yalong Wang Rui Yin Hu Liu Chuntai Liu Changyu Shen State Key Laboratory of Structural Analysis Optimization and CAE Software for Industrial EquipmentNational Engineering Research Center for Advanced Polymer Processing TechnologyZhengzhou UniversityZhengzhou 450002China State Key Laboratory of Structural Analysis Optimization and CAE Software for Industrial EquipmentNational Engineering Research Center for Advanced Polymer Processing TechnologyZhengzhou UniversityZhengzhou 450002China China Astronaut Research and Training Center Beijing 100094China

With the rapid development of wearable electronic skin technology,flexible strain sensors have shown great application prospects in the fields of human motion and physiological signal detection,medical diagnostics,and human-computer interaction owing to their outstanding sensing *** pa-per reports a strain sensor with synergistic conductive network,consisting of stable carbon nanotube dispersion(CNT)layer and brittle MXene layer by dip-coating and electrostatic self-assembly method,and breathable three-dimensional(3D)flexible substrate of thermoplastic polyurethane(TPU)fibrous membrane prepared through electrospinning *** MXene/CNT@PDA-TPU(MC@p-TPU)flexible strain sensor had excellent air permeability,wide operating range(0-450％),high sensitivity(Gauge Fac-tor,GF max=8089.7),ultra-low detection limit(0.05％),rapid response and recovery times(40 ms/60 ms),and excellent cycle stability and durability(10,000 cycles).Given its superior strain sensing capabilities,this sensor can be applied in physiological signals detection,human motion pattern recognition,and driv-ing exoskeleton *** addition,MC@p-TPU fibrous membrane also exhibited excellent photothermal conversion performance and can be used as a wearable photo-heater,which has far-reaching application potential in the photothermal therapy of human joint diseases.

关键词： Flexible strain sensors Synergistic conductive network Electrospinning fibrous membrane Motion monitoring Human-machine interface

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