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High toughness and strong electromagnetic shielding properties of PAM/PEG dual network hydrogels

International Journal of Minerals,Metallurgy and materials 2025年第3期32卷 747-755页

作者： Kunlan Diao Yuhuan Xu Jingyu Du Teng Zhou Xiao Zhan Daohai Zhang Xiaosi Qi Shuhao Qin School of Chemical Engineering Guizhou Minzu UniversityGuiyang 550025China College of Physics Guizhou UniversityGuiyang 550025China National Engineering Research Center for Compounding and Modification of Polymer Materials Guiyang 550014China

With the wide application of electromagnetic wave,a high performance electromagnetic shielding material is urgently needed to solve the harm caused by electromagnetic *** cross-linking strategy is adopted in this ***(PAM)was synthesized by in-situ polymerization of acrylamide(AM)*** obtained PAM was blended with polyethylene glycol(PEG)to prepare PAM/PEG hydrogels and form rigid support ***,the modified carbon nanotubes(S-CNTs)were incorpor-ated into sodium alginate(SA)and PAM/***,Na+was used to trigger SA self-assembly,which significantly improved the mechanical properties and electrical conductivity of the hydrogels,and prepared PAM/PEG/SA/S-CNTs-Na hydrogels with high tough-ness and strong electromagnetic interference(EMI)shielding efficiency(SE).The results showed that the compressive strength of PAM/PEG/SA/S-CNTs-Na hydrogel was 19.05 MPa,which was 7.69%higher than that of PAM/PEG hydrogel(17.69 MPa).More en-couraging,the average EMI SE of PAM/PEG/SA/S-CNTs-Na hydrogels at a thickness of only 3 mm and a CNTs content of 16.53wt%was 32.92 dB,which is 113.21%higher than that of PAM/PEG hydrogels(15.44 dB).

关键词： polyacrylamide polyethylene glycol sodium alginate carbon nanotubes electromagnetic shielding

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research progress of lignin-derived materials in lithium/sodium ion batteries

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Green Energy & Environment 2025年第2期10卷 322-344页

作者： Jingke Zhang Hengxue Xiang Zhiwei Cao Shichao Wang Meifang Zhu Institute of Hybrid Materials National Center of International Research for Hybrid Materials TechnologyNational Base of International Science&Technology CooperationCollege of Materials Science and EngineeringQingdao UniversityQingdao266071China State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and EngineeringDonghua UniversityShanghai201620China

With the increase of energy consumption,the shortage of fossil resource,and the aggravation of environmental pollution,the development of cost-effective and environmental friendly bio-based energy storage devices has become an urgent *** the second most abundant natural polymer found in nature,lignin is mainly produced as the by-product of paper pulping and bio-refining *** possesses several inherent advantages,such as low-cost,high carbon content,abundant functional groups,and bio-renewable,making it an attractive candidate for the rechargeable battery ***,there has been a surge of research interest in utilizing lignin or lignin-based carbon materials as the components of lithium-ion(LIBs)or sodium-ion batteries(SIBs),including the electrode,binder,separator,and *** review provides a comprehensive overview on the research progress of lignin-derived materials used in LIBs/SIBs,especially the application of lignin-based carbons as the anodes of LIBs/*** preparation methods and properties of lignin-derived materials with different dimensions are systemically discussed,which emphasizes on the relationship between the chemical/physical structures of lignin-derived materials and the performances of LIBs/*** current challenges and future prospects of lignin-derived materials in energy storage devices are also proposed.

关键词： Lignin-based carbons Lithium battery Sodium battery Chemical structure evolution

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Constructing PAM/PEG Electromagnetic Shielding Hydrogels Based on MWCNTs@TiO₂

SSRN

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SSRN 2025年

作者： Zhou, Teng Zhang, Daohai Diao, Kunlan Du, Jiajia Hu, Yupeng Lei, Zhi Liu, Dongju Liu, Shan Qin, Shuhao School of Chemical Engineering of Guizhou Minzu University Guiyang Guizhou550025 China National Engineering Research Center for Compounding and Modification of Polymer Materials Guiyang Guizhou550014 China School of Materials and Energy Engineering Guizhou Institute of Technology Guiyang Guizhou550003 China

With the widespread popularity of digital technology, EMI has become a new type of pollution that endangers electronic equipment and biological systems. In this paper, MWCNTs@TiO₂ composite materials were prepared by the hydrothermal synthesis method and then added into the three dimensional framework constructed by PAM (polyacrylamide) and PEG (polyethylene glycol) to obtain hydrogels with EMI functionality. It was found that in the M@T/PAM-4 hydrogel, due to the fact that TiO₂ particles were loaded on the surface of MWCNTs, its cross section presented a granular shape. As the content of MWCNTs increased, the EMI SET of the hydrogel increased, with the M@T/PAM-4 hydrogel reaching 29 dB. The electrical conductivity and mechanical properties also increased accordingly. Compared with the pure PAM hydrogel, they were respectively improved by 626% and 24.5%, which was attributed to the formation of a conductive network by MWCNTs and the enhancement of interfacial polarization, etc. Meanwhile, the water retention rate of the M@T/PAM-4 hydrogel could still reach 34.1% after 8 hours. Moreover, it also had a relatively high water content of 69.08%. Therefore, This improves the application value and development prospects of the hydrogel in fields such as EW shielding. © 2025, The Authors. All rights reserved.

关键词： Electromagnetic shielding

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EFFECTS OF INTERPARTICLE DISTANCE,TEMPERATURE AND INTERFACIAL ADHESION ON BRITTLE-DUCTILE TRANSITION FOR NYLON 6/ABS BLENDS

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Chinese Journal of polymer Science 2009年第5期27卷 719-728页

作者：于杰 National Engineering Research Center for Compounding and Modification of Polymeric Materials

The toughness of blends composed of nylon 6 and acrylonitrile-butadiene-styrene(ABS) compatibilized by using styrene-maleic anhydride(SMA) as a compatibilizer was measured over a wide temperature *** reveal that the combining effects of particle size and volume fraction of ABS on the toughness of nylon 6/ABS/SMA blends can be described through plotting brittle-ductile transition of the impact strength versus the interparticle distance(ID) on the assumption that ABS domains relieve the triaxial te...

关键词： Brittle ductile transition Interfacial adhesion Fractography.

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Na and O Co-doped Carbon Nitride for Efficient Photocatalytic Hydrogen Evolution

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Wuji Cailiao Xuebao/Journal of Inorganic materials 2025年第5期40卷 552-562页

作者： Chen, Libo Sheng, Ying Wu, Ming Song, Jiling Jian, Jian Song, Erhong School of Chemistry and Chemical Engineering Hunan University of Science and Technology Xiangtan411201 China National Engineering Research Center for Compounding and Modification of Polymer Materials Guiyang550014 China Shanghai Institute of Ceramics Chinese Academy of Sciences Shanghai200050 China

Elemental doping is an effective strategy for tuning the band structure of graphite carbon nitride (CN) to enhance its photocatalytic performance. In this study, sodium (Na) and oxygen (O) co-doped carbon nitride (Na/O-CNx, x=1.0, 2.0, 3.0, 4.0) was synthesized via solid-phase reaction of sodium citrate (NaCA) and pure CN powder in the Teflon-sealed autoclave under air conditions at 180 ℃. Surface area of Na/O-CN3.0 is measured to be 18.8 m2/g, increasing by 60.7% compared to that of pure CN (11.7 m2/g). Bandgap energy of Na/O-CN3.0 is determined to be 2.68 eV, marginally lower than that of pure CN (2.70 eV), thereby enhancing its capacity for sunlight absorption. Meanwhile, the incorporation of Na and O atoms into Na/O-CNx is found to effectively reduce recombination rates of photogenerated electron-hole pairs. As a result, Na/O-CNx samples exhibit markedly enhanced photocatalytic hydrogen evolution activity under visible light irradiation. Notably, the optimal Na/O-CN3.0 sample achieves a photocatalytic hydrogen production rate of 103.2 μmol·g–1·h–1, which is 8.2 times greater than that of pure CN (11.2 μmol·g–1·h–1). Furthermore, a series of Na/O-CNx-yO2 (y=0, 20%, 40%, 60%, 80%, 100%) samples were prepared by modulating the oxygen content within reaction atmosphere. The catalytic performance evaluations reveal that the incorporation of both Na and O atoms in Na/O-CN3.0 enhances photocatalytic activity. This study also introduces novel methodologies for synthesis of metal atom-doped CN materials at lower temperature, highlighting the synergistic effect of Na and O atoms in photocatalytic hydrogen production of Na/O-CNx samples. © 2025 Science Press. All rights reserved.

关键词： Photocatalytic activity

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Multifunctional polysulfone composite membranes via constructing electrically conductive gradient and magnetic-core/electric-shell dual-gradient microstructures: A strategy to tackle multiple hazards

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Journal of Colloid and Interface Science 2025年 697卷

作者： Shuhao Qin Kang Li Ting Lei Yufei Liu Huiju Shao College of Materials Science and Metallurgy Guizhou University Guiyang 550025 China National Engineering Research Center for Compounding and Modification of Polymer Materials Guiyang 550014 China

The rapid advancement of industries and technologies leads to the emergence of new pollutants such as dyeing wastewater and electromagnetic interference (EMI), and their efficient treatment poses great challenges for traditional materials and methods. Herein, a novel electrically conductive membrane (ECM) was fabricated on a large scale through the electric field-assisted membrane formation. Carbon nanotubes (CNTs) and carbon black (CB) were uniformly dispersed in dope solution by strong hydrogen bonding with suitable polyvinylpyrrolidone (PVP) molecules. They moved towards the coating layer upper surface under an electric field, forming electrically conductive gradient microstructures. Subsequently, a stable electrically conductive skin layer was generated due to the excellent film-forming ability of PVP, which hindered the loss of CNTs and CB into coagulating bath. The optimized membrane possessed a high electrical conductivity of 34.3 ± 0.7 S/m, and exhibited superior permeate fluxes (>515.6 L/m 2 h·bar), dye rejections (>87.1 %) and flux recovery ratios (>91.5 %) in the electric-assisted filtration. Moreover, magnetic Fe 3 O 4 nanoparticles were incorporated on the bottom surface and inside the pores by vacuum filtration, yielding an innovative magnetic-core/electric-shell dual-gradient microstructure. Electromagnetic wave went through an “absorption-multiple reflection/absorption-strong reflection-reabsorption/multiple reflection” process within the membrane, and then was consumed through the superposition of magnetic loss, polarization loss and conducting loss. Accordingly, the membrane displayed an EMI shielding efficiency of 23.6 ± 0.5 dB with a thickness of 0.2 mm at a low CB-CNTs loading of 20 wt%. This work provides a strategic framework for designing adaptable multifunctional membranes, bridging critical applications from wastewater remediation to next-generation electronic shielding technologies.

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Synergistic Flame-retardant Effect of Epoxy Resin Combined with Phenethyl-bridged DOPO Derivative and Graphene Nanosheets

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Chinese Journal of polymer Science 2019年第1期37卷 79-88页

作者： Wei Yan Ming-Qiu Zhang Jie Yu Sheng-Qiang Nie Dai-Qin Zhang Shu-Hao Qin School of Chemistry Sun Yat-sen University School of Chemistry and Materials Engineering Guiyang University National Engineering Research Center for Compounding and Modification of Polymer Materials

Phenethyl-bridged DOPO derivative(DiDOPO)was combined with graphene nanosheets(GNSs)in epoxy resin(EP)to improve its flame *** results indicated that the introduction of only 1.5 wt%DiDOPO/1.5 wt%GNS in EP increased the limited oxygen index(LOI)from 21.8%to 32.2%,hence meeting UL 94 V-0 *** thermogravimetric analyses revealed that char yield rose in presence of GNSs to form thermally stable carbonaceous *** decomposition and pyrolysis products in gas phase were characterized by thermogravimetry-Fourier transform infrared spectroscopy(TG-FTIR),and the release of large amounts of phosphorus was detected in the gas *** evaluation of flame-retardant effect by cone calorimetry demonstrated that GNSs improved the protective-barrier effect of fire residue of EP/DiDOPO/*** latter was further confirmed by digital photography and scanning electron microscopy(SEM).Also,Raman spectroscopy showed that GNSs enhanced graphitization degree of the resin during ***,the combination of DiDOPO with GNSs provides an effective way for developing high-performance resins with improved flame retardancy.

关键词： Epoxyresin DOPO derivative GNS Flame retardancy

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EFFECT OF INCORPORATING STARCH/SILICA COMPOUND FILLERS INTO UNCURED SSBR ON ITS DYNAMIC RHEOLOGICAL PROPERTIES

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Chinese Journal of polymer Science 2008年第6期26卷 751-757页

作者：郑强 Department of Polymer Science and Engineering Zhejiang University Key Laboratory of Macromolecular Synthesis and Functionalization Ministry of Education National Engineering Research Center for Compounding and Modification of Polymeric Materials

The dynamic rheological properties of a composite composed of solution-polymerized styrene butadiene rubber (SSBR) filled with starch/silica (SiO_2) compound fillers were studied by means of temperature,frequency and strain sweeps, respectively,and the influence of the starch content in the compound fillers (SCCF) on the rheological behaviors was *** is found from frequency sweeps that a maximum of loss tangent (tanδ) appears at 20 rad/s,which is independent of SCCF.G of the composites decreases w...

关键词： Styrene butadiene rubber Silica Starch Rheological behavior.

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FINITE ELEMENT SIMULATION FOR YIELD STRESS OF HARD POLY(VINYL CHLORIDE)/ACRYLONITRILE-BUTADIENE-STYRENE BLENDS AT DIFFERENT CROSSHEAD SPEEDS

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Chinese Journal of polymer Science 2011年第6期29卷 757-761页

作者：宋义虎郑强 Key Laboratory of Macromolecular Synthesis and Functionalization of Ministry of Education Department of Polymer Science and EngineeringZhejiang University National Engineering Research Center for Compounding and Modification of Polymeric Materials

Hard poly（vinyl chloride）（PVC）/acrylonitrile-butadiene-styrene （ABS） blends were prepared using injection- molding and influence of crosshead speed on mechanical properties was examined. Based on morphology parameters obtained from transmission electron microscopy photography and the material parameters from true stress-strain curves of neat PVC and ABS, yield stresses of the blends at different crosshead speeds were simulated employing a two-dimensional nine-particle model based on the finite element analysis （FEA）. The FEA results were compared with the experimental yielding stress and the good agreement validated the simulation approach. The FEA approach allowed establishing a yielding criterion related to local yielding of the interstitial matrix between ABS particles.

关键词： Poly(vinyl chloride) (PVC) Acrylonitrile-butadiene-styrene (ABS) resin Deformation and fracture Simulation and modeling.

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Rheological Behavior of the Melts for Polyethylene-based Montmorillonite Nanocomposites

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Chemical research in Chinese Universities 2006年第5期22卷 651-657页

作者： YANG Hong-mei ZHENG Qiang DU Miao Department of Polymer Science and Engineering Zhejiang University Hangzhou 310027 P. R. China National Engineering Research Center for Compounding and Modification of Polymer Materials Guiyang 550025 P. R. China

The viscoelastic properties of melts of nanocomposites with partially exfoliated structures, which were composed of low-density polyethylene （LDPE）, ethylene vinyl acetate copolymer （EVA）, and montmofillonite and modified by cetyltrimethyl ammonium bromide and octadecyltrimethyl ammonium bromide, were studied. The results obtained through measurements of the dynamic storage modulus G′, the dynamic loss modulus G″, and the transiem stress relaxation modulus G（t） of the composites, reveal that the viscoelastic properties of the composites strongly depend on the amount of montmorillonite that is exfoliated into the composites. With the increase in montmoriUonite content, the composites show an obvious property of pseudo solid-like materials within the region of lower frequencies （ω）. The montmorillonite layers are aligned along the stress direction, and the dependence of dynamic modulus on ω, appears quite different for the composites before and after being exposed to a large amplitude oscillatory shears.

关键词： Rheological behavior Nanocomposite Polyethylene Montmorillonite

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