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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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Electron structure variations in hindered phenolic antioxidant induced enhancement of thermo-oxidative aging performance in polyamide 6

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RSC Advances 2025年第19期15卷 14594-14603页

作者： Guo, Bingxue Lou, Jinfen Kuang, Tingting Wang, Yanping Zhang, Kai Qin, Jun He, Min Liu, Yufei Gong, Yong-Ji School of Materials Science and Metallurgical Engineering Guizhou University Guiyang550025 China National Engineering Research Center for Compounding and Modification of Polymeric Materials Guiyang550014 China Key Laboratory of Karst Environment and Geohazard Prevention College of Resources and Environmental Engineering Guizhou University Guizhou Province Guiyang550025 China

PA6 is widely used but vulnerable to thermo-oxidative aging, impacting its durability. Hindered phenols are key antioxidants that extend the service life of PA6 by slowing this aging process. However, the effect of molecular structural differences on their antioxidant activity is still elusive, impeding their development and application. Here, two antioxidants, 2-((3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyl)oxy)ethyl acrylate (PEA) and 2-((3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyl)oxy)propyl acrylate (PPA), were utilized to enhance the thermo-oxidative aging resistance of PA6. Their primary difference is that PPA possesses an electron-donating group in its molecular structure. The methyl functional group in the PPA molecule can increase the electron cloud density around the benzene ring, resulting in PPA having a higher free radical scavenging rate compared to PEA. In addition, in contrast to PEA, the low volatility and mobility of PPA ensure that its antioxidant activity can be fully utilized during aging. These factors collectively support the excellent antioxidant activity of PPA (PPA > PEA). As a result, the PA6/PPA composite maintains 88% of its original tensile strength after 12 days of continuous aging, whereas PA6/PEA and PA6/1010 (commercial antioxidant) composites retained 70% and methyl 30%, respectively. These encouraging findings provide a theoretical basis for the synthesis of antioxidants. © 2025 The Royal Society of Chemistry.

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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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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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Effects of Annealing Process on Crystallization and Low Temperature Resistance Properties of PP-R Composites

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Journal of Wuhan University of Technology(materials Science) 2018年第4期33卷 855-862页

作者：麻玉龙 WANG Xiaomeng LIU Wei 龚维何力 College of Materials and Architectural Engineering Guizhou Normal University Guizhou Institute of Metallurgy and Chemical Engineering National Engineering Research Center for Compounding and Modification of Polymeric Materials

The effects of the annealing process on the mechanical properties and crystallization behaviors of polypropylene random copolymer（PP-R） composites were investigated using differential scanning calorimetry（DSC）, wide-angle X-ray diffraction（WAXD）, and dynamic mechanical analysis（DMA）, and scanning electron microscopy（SEM）. The experimental results indicated that the annealing process significantly influenced the comprehensive properties of PP-R composites. At temperatures below 23 ℃, the impact strength of the PP-R composites annealed at 120 ℃ for 6 h was relatively high at 74.73 k J/m^2, which was 16.8% higher than that of the samples annealed at 80 ℃ for 6 h. At low temperatures（-30-0 ℃）, the impact strength ranged from approximately 13.31 k J/m^2 to 54.4 k J/m^2. In addition, the annealing process conducted at 120 ℃ for 6 h improved the crystalline structure and low-temperature toughness of the PP-R composites and induced α-form to β-form crystal transformation. The work provides a possible method to reinforce and toughen the semicrystalline polymer at low temperatures（-30-0 ℃） by annealing.

关键词： polypropylene crystallization annealing process low temperature toughness

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