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Chemical Recycling of Poly(ethylene furanoate)into Value-added Poly(ethylene-co-isosorbide furanoate)

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Chinese Journal of Polymer Science 2023年第10期41卷 1533-1542页

作者： Jing Li Sheng Wang Huan-Jun Lu Ying-Jia Lan Xiao-Hong Li Ying-Feng Tu Jiangsu Engineering laboratory of Novel Functional polymeric materials State and Local Joint Engineering Laboratory for Novel Functional Polymeric MaterialsCollege of ChemistryChemical Engineering and Materials ScienceSoochow UniversitySuzhou215123China Jiangsu key laboratory for Micro and Nano Heat Fluid Flow technology and Energy application School of Physical Science and TechnologySuzhou University of Science and TechnologySuzhou215009China

We present here a novel strategy for the chemical recycling of bio-based poly(ethylene furanoate)s(PEF)to value-added high-performance bio-based poly(ethylene-co-isosorbide furanoate)(PEIF)copolyesters by the combination of cyclodepolymerization method with rapid cascade polycondensation-coupling ring-opening polymerization(PROP).The solution cyclodepolymerization of commercially available PEF affords cyclic oligo(ethylene 2,5-furandicarboxylate)s(COEFs),and the effects of reaction conditions on the yield of COEFs were *** copolyesters with different isosorbide(IS)contents were synthesized via the cascade PROP of COEFs with IS,which show significant enhanced glass transition *** melt spinning,PEIF fibers with different orientation factors were prepared,with excellent thermal stability and mechanical *** obtained PEIF fibers can lift a weight∼25000 times higher than its *** PEIF fibers are stable under ambient conditions but are biodegradable following the“surface erosion”*** sustainable value-added biodegradable PEIF fibers offer a solution to the environmentally friendly fibers.

关键词： bio-based Chemical recycling Fiber PROP Sustainable

Phase constitution and microstructure of Ce–Fe–B strip-casting alloy

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Chinese Physics B 2014年第10期23卷 508-512页

作者：严长江郭帅陈仁杰李东闫阿儒 key laboratory of Magnetic materials and Devices Ningbo Institute of Material Technology and EngineeringChinese Academy of Sciences zhejiang Province key laboratory of Magnetic materials and application technology Ningbo Institute of Material Technology and EngineeringChinese Academy of Sciences

The strip-casting technique plays an important role in fabricating high coercivity sintered magnet. In this paper, we investigate the phase constitution and the microstructure of rapidly solidified Ce-Fe-B alloy fabricated by strip-casting. We find that the Ce2FelgB phase coexists with Fe, Fe2B, and CeFe2 phases in the Ce-Fe-B strips. The eutectic stucture consisting of Fe and Fe2B is encased in Ce2Fe14B grains, which is blocked by the CeFe2 grains at triple junctions, indicating that the microstructure of Ce-Fe-B strip is characteristic of a peritectic solidification. Thermal analysis indicates that the large supercooling of Ce2Fe14B results in the residual Fe and Fe2B. The microstructural optimization in Ce-Fe-B strips without Fe and Fe2B could be achieved by a heat treatment of 1000 ℃.

关键词： magnetic material Ce-Fe-B microstructure rapid solidification

Effects of Nd-Ga intergranular addition on microstructure and magnetic properties of heavy-rare-earth-free Nd-Fe-B sintered magnets

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Journal of Rare Earths 2022年第6期40卷 924-929,I0003页

作者： Jinhao Zhu Guangfei Ding Lei Jin Zhehuan Jin Bo Zheng Shuai Guo Renjie Chen Aru Yan CAS key laboratory of Magnetic materials and Devices and Zhejiang Province Key Laboratory of Magnetic Materials and Application TechnologyNingbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo 315201China University of Chinese Academy of Sciences Beijing 100049China

In this study,we propose an approach of grain boundary modification that can significantly increase the coercivity of the B-lean Nd-Fe-B sintered magnets by intergranular addition of *** coercivity is substantially enhanced from 1.51 to 2.04 T through optimizing the microstructure and adjusting the phase composition for the grain boundary phase in the annealed *** matrix grains are covered by a continuous thin grain boundary phase accompanying the formation of intermetallic Nd_(6)Fe_(13)Ga *** analysis of magnetic behaviors above Curie temperature confirms that the grain boundary phase of annealed Nd-Ga doped magnets appears to be non-ferromagnetic,facilitating the intergrain exchange *** observation in grain boundary area indicates that some surface of the matrix grain is dissolved in the formation process of the Nd_(6)Fe_(13)Ga *** gives rise to a decrease in the proportion of matrix grains and saturation magnetization of the *** detailed relationship between magnetic properties and microstructure is discussed based on these results.

关键词： Nd-Fe-B sintered Magnet Magnetic properties Grain boundary Microstructures Rare earths

Enhanced energy storage behaviors in free-standing antiferroelectric Pb(Zr_(0.95)Ti_(0.05))O_3 thin membranes

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Chinese Physics B 2016年第8期25卷 388-392页

作者：左正笏詹清峰陈斌杨华礼刘宜伟刘鲁萍谢亚丽李润伟 key laboratory of Magnetic materials and Devices Ningbo Institute of Material Technology and EngineeringChinese Academy of Sciences zhejiang Province key laboratory of Magnetic materials and application technology Ningbo Institute of Material Technology and Engineering Chinese Academy of Sciences

Free-standing antiferroelectric Pb（Zr0.95Ti0.05O3（PZT（95/5）） thin film is fabricated on 200-nm-thick Pt foil by using pulsed laser deposition.X-ray diffraction patterns indicate that free-standing PZT（95/5） film possesses an α-axis preferred *** critical electric field for the 300-nm-thick free-standing PZT（95/5） film transiting from antiferroelectric to ferroelectric phases is increased to 770 kV/cm,but its saturation polarization remains almost unchanged as compared with that of the substrate-clamped PZT（95/5） *** energy storage density and energy efficiency of the substrate-clamped PZT（95/5） film are 6.49 J/cm^3 and 54.5%,*** contrast,after removing the substrate,the energy storage density and energy efficiency of the free-standing PZT（95/5） film are enhanced up to 17.45 J/cm^3 and 67.9%,respectively.

关键词： antiferroelectric films freestanding energy storage

Rheological Behaviors of Polymers with Nanoparticles Tethered at Each End

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Chinese Journal of Polymer Science 2024年第3期42卷 400-406,I0009页

作者： Song-Qi Zhang Wen-Qing Wang Jia-Ping Lin Li-Quan Wang Shanghai key laboratory of Advanced polymeric materials Key Laboratory for Ultrafine Materials of Ministry of EducationSchool of Materials Science and EngineeringEast China University of Science and TechnologyShanghai 200237China

The polymer with nanoparticles tethered at each end is a unique model for unraveling the effect of chain ends on the polymer dynamics. We investigated the rheological behavior of this kind of polymer by using nonequilibrium molecular dynamics simulation. The effect of polymer lengths and nanoparticle radii on the complex moduli and viscosity was examined. The dependence of complex moduli on the frequency becomes less pronounced as the polymer is short or the nanoparticle is large. The shear thinning behavior was revealed for these systems, and the scaling exponent of complex viscosity with respect to the frequency was found to change from-1/2 to-3/4 as the polymer shortens or the nanoparticle enlarges. The rheological behavior was further explained by analyzing the mean square distance of nanoparticles. The simulation results were compared with the existing experimental finding, showing an agreement. The work provides information for understanding the chain end effect on polymer rheology.

关键词： Polymer rheology Modulus Viscosity Molecular dynamics

Directional Photo-manipulation of Self-assembly Patterned Microstructures

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Chinese Journal of Polymer Science 2018年第3期36卷 297-305页

作者： Wei Wang Fei Gao Yuan Yao Shao-Liang Lin Shanghai key laboratory of Advanced polymeric materials Key Laboratory for Ultrafine Materials of Ministry of EducationSchool of Materials Science and EngineeringEast China University of Science and TechnologyShanghai 200237China

Highly intricate surface architectures derived from patterned polymer microstructures have received increasing concern in recent *** photo-manipulation(DPM)of azopolymers is one of the effective strategies to tune the patterned polymer microstructures through directional mass migration(DMM)upon polarized light *** this feature article,we emphasize the latest advances of DPM on azopatterns created by *** mechanism of DMM,the photo-manipulation performance,and functions of manipulated patterns are introduced in *** presented,DPM can manipulate the as-prepared microstructures feasibly by taking the advantages of non-contacting and nondestructive ***,the challenges and opportunities of DPM strategy are discussed in conclusion.

关键词： Self-assembly Directional photo-manipulation Surface patterning Azopolymer

Optimizing Photovoltaic Performance by Kinetic Quenching of Layered Heterojunctions

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Chinese Journal of Polymer Science 2022年第1期40卷 29-37页

作者： Li-Feng Xu Zhan-Wen Xu Jia-Ping Lin Li-Quan Wang Shanghai key laboratory of Advanced polymeric materials Key Laboratory for Ultrafine Materials of Ministry of EducationSchool of Materials Science and EngineeringEast China University of Science and TechnologyShanghai 200237China

The mixing morphology control plays a crucial role in photovoltaic power generation,yet this specific effect on device performances remains ***,we employed computational approaches to delineate the photovoltaic properties of layered heterojunction polymer solar cells with tunable mixing ***-step quench and two-step quench strategies were proposed to adjust the mixing morphology by thermodynamic and kinetic *** computation for the one-step quench revealed that modulating interfacial widths and interfacial roughness could significantly promote the photovoltaic performance of layered heterojunction polymer solar *** two-step quench can provide a buffer at a lower temperature before the kinetic quenching,leading to the formation of small-length-scale islands connected to the interface and a further increase in photovoltaic *** discoveries are supported by recent experimental evidence and are anticipated to guide the design of photovoltaic materials with optimal performance.

关键词： Dissipative particle dynamics Drift-diffusion model Polymer solar cells Quench

High-temperature-tolerant flexible supercapacitors: Gel polymer electrolytes and electrode materials

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Journal of Energy Chemistry 2025年第1期100卷 426-457页

作者： Chong Peng Xinyi Huang Mingwei Zhao Shuling Liao Quanhong Yang Nianjun Yang Siyu Yu School of Chemistry & Chemical Engineering Southwest University Nanoyang Group Tianjin Key Laboratory of Advanced Carbon and Electrochemical Energy Storage School of Chemical Engineering and Technology and Collaborative Innovation Center of Chemical Science and Engineering (Tianjin) Tianjin University Department of Chemistry & IMO-IMOMEC Hasselt University

The development of flexible supercapacitors(FSCs) capable of operating at high temperatures is crucial for expanding the application areas and operating conditions of supercapacitors. Gel polymer electrolytes and electrode materials stand as two key components that significantly impact the efficacy of hightemperature-tolerant FSCs(HT-FSCs). They should not only exhibit high electrochemical performance and excellent flexibility, but also withstand intense thermal stress. Considerable efforts have been devoted to enhancing their thermal stability while maintaining high electrochemical and mechanical performance. In this review, the fundamentals of HT-FSCs are outlined. A comprehensive overview of state-of-the-art progress and achievements in HT-FSCs, with a focus on thermally stable gel polymer electrolytes and electrode materials is provided. Finally, challenges and future perspectives regarding HT-FSCs are discussed, alongside strategies for elevating operational temperatures and *** review offers both theoretical foundations and practical guidelines for designing and manufacturing HT-FSCs, further promoting their widespread adoption across diverse fields.

关键词： Polymer membrane electrodes

Concurrent improvements of corrosion resistance and coercivity in Nd-Ce-Fe-B sintered magnets through engineering the intergranular phase

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Journal of materials Science & technology 2022年第15期110卷 239-245页

作者： Jiaying Jin Yongming Tao Xinhua Wang Zeyu Qian Wang Chen Chen Wu Mi Yan School of materials Science and Engineering State Key Laboratory of Silicon MaterialsKey Laboratory of Novel Materials for Information Technology of Zhejiang ProvinceZhejiang UniversityHangzhou 310027China

Usually the improved coercivity of rare earth(RE)based 2:14:1-type permanent magnets via RE-rich intergranular additives is achieved at the cost of more corrosion channels and deteriorated corrosion resistance,which remains a challenging hurdle in the RE-Fe-B ***,here we report the concurrent improvements of corrosion resistance and coercivity in 40 wt.%Ce-substituted Nd-Ce-Fe-B sintered magnets through engineering the intergranular phase using simple(Nd,Pr)H_(x)*** dehydrogenated Nd/Pr changes the RE concentration gradients between 2:14:1 matrix and intergranular phases during sintering and enlarges the fraction of corrosion-resistant REFe_(2) phase,rather than the conventionally assumed Nd/Pr-rich intergranular phase with high chemical *** spontaneous formation of REFe_(2) intergranular phase after(Nd,Pr)H_(x) addition generates the uniquely enhanced corrosion resistance against the hot/humid and acidic environments,and counts as one peculiar feature of Nd-Ce-Fe-B magnets at high Ce substitution level,being distinct from previously reported Ce-free/lean ***,the formation of continuous grain boundaries enhances the coercivity from 8.7to 12.5 k Oe with trace addition of(Nd,Pr)H_(x).Above findings may spur progress towards developing a high-performance Nd-Ce-Fe-B permanent magnet.

关键词： Abundant rare earth Ce Corrosion resistance REFe_(2) Coercivity Microstructure