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Sodium alginate/carbon nanotube energy harvesting fibers:Axial functional group gradient and moist-electric performance

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材料科学技术（英文版） 2025年第5期208卷 67-77页

作者： Rui Zhang Jinxue Li Yu Yin Yonghao Chen Qifeng Huang Ping Tang Hai Wang Yuezhen Bin Department of Polymer Science and Engineering School of Chemical EngineeringDalian University of TechnologyDalian 116024China

Moist-electric generation,a green and environmentally friendly energy harvesting technology,is undoubt-edly one of the effective methods to alleviate energy shortages and environmental ***,the lack of fiber-like moist-electric generators(MEGs)that combine continuous power generation and high electrical output performance has constrained the development of moist-electric in the fields of flexi-ble wearable and self-power *** this work,sodium alginate(SA)/multi-walled carbon nanotubes(MWCNT)fibers with axial heterogeneous(axi-he)of oxygen-containing functional groups(Ocfgs)are prepared through a mold forming method in assistance with the coagulation *** interaction be-tween axi-he MEG and moisture is investigated by analyzing the electrical signal changes of dried MEG under moisture *** maximum output voltage and current of axi-he MEG can reach 0.35 V and 1.92 pA under the stimulation of *** on the regulation of Ocfgs,axi-he MEG has a con-tinuous high moist-electric performance and environmental *** maximum output power density(Pmo)of axi-he MEG with a length of only 2 cm can reach 27.37 pW cm-2 at RH=90％,which exceeds most of the MEGs reported in ***,a continuous output voltage of 0.33-0.37 V for more than 15 h can be obtained from this axi-he ***,the axi-he MEG from Ocfg distribution design and mold forming method provides a new way of clean energy generation using moisture from the ambient environment,exhibiting enormous potential in energy supply for Internet of Things(loT)devices.

关键词： Sodium alginate Multi-walled carbon nanotube Moist-electric Axial heterogeneous Fiber

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Interfacial engineering of polymer Blend with Janus Particle as Compatibilizer

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Chinese Journal of polymer science 2023年第4期41卷 500-515,I0005页

作者： Hai-Ling He Fu-Xin Liang Institute of Polymer Science and Engineering Department of Chemical EngineeringTsinghua UniversityBeijing100084China

Mixing two or more polymers to produce the“polymer alloy”is one of the most versatile and economical strategies for developing new polymeric *** compatibility between polymer components largely determines the comprehensive performance of polymer *** recently,a type of unique surface partitioned materials,Janus particles,has been proposed to act as a novel interfacial compatibilizer for polymer *** Janus particles integrates the amphipathicity of diblock copolymer and interfacial stabilization of nanoparticles,displaying a significant superiority in comparison with molecular compatibilizers for a wide range of polymer *** this review,we mainly focus on the compatibilizing effects of Janus nanofillers of various morphologies,including spherical,snowman-like,and two-dimensional nanosheets,on polymer *** shed light on the impacts of compatibilization of Janus particles on phase morphologies,mechanical properties,and functionalities of polymer *** review could provide a guidance for designing an effective Janus particle compatibilizer to develop high-performance polymer blends.

关键词： Janus particles Compatibilizer polymer blend Interfacial engineering

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Multicomponent polymerization of sulfur, chloroform and diamine toward polythiourea

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science China Chemistry 2023年第3期66卷 870-877页

作者： Nan Zheng He Gao Zihui Jiang Wangze Song Department of Polymer Science and Engineering School of Chemical EngineeringDalian University of TechnologyDalian 116024China

The efficient utilization of elemental sulfur(S8) for developing high value-added chemicals is a global concern considering its abundant sources and yearly accelerating environmental issues. However, it has been a long-standing challenge to directly transform elemental sulfur to sulfur-containing polymer, especially via an environmentally benign manner. Herein, a unique chemo-differentiating multicomponent polymerization(MCP) of elemental sulfur, chloroform, and diamine is reported to construct polythiourea based on amine-involved two sequential reactions including isothiocyanation and nucleophilic *** strategy features isocynide-free monomers as starting materials, mild conditions, high molecular weights(up to72,900 g/mol) and desired yields(up to 83%). With the advantages of inactive isocyanation and active nucleophilic addition, the stoichiometric balance of amine and isothiocyanate could be delicately controlled to afford various polythioureas with high molecular weights. The polythioureas have been further utilized in the Cu-based aqueous catalysis and Hg-based ion adsorption.

关键词： multicomponent polymerization elemental sulfur polythiourea environmental friendliness

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Viscoelastic Property Evolution of Thermoplastic Polyurethane during Annealing Treatment and Its Correlation with Segmental Crystallization

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Chinese Journal of polymer science 2024年第12期42卷 1976-1985,I0010页

作者： Jian-Wen Shan Yan-Bo Zhu Ling-Ling Ni Peng-Ju Pan State Key Laboratory of Chemical Engineering College of Chemical and Biological EngineeringZhejiang UniversityHangzhou310058China Department of Polymer Science and Engineering Zhejiang UniversityHangzhou310058China

Viscoelastic properties of thermoplastic polyurethane(TPU)is of fundamental importance for its *** this work,we prepared different TPUs from polycaprolactone(PCL)diol,diphenylmethane-4,4′-diisocyanate(MDI),and 1,4-butanediol(BDO),and investigated the viscoelastic behavior of three TPUs with different hard segment content during thermal annealing *** storage modulus(G′)of TPU increases over time in a medium annealing temperature(T_(a))region,but remains unchanged at both high and low temperature *** growth of loss modulus(G″)over time is slower than that of G′.At medium T_(a),both G′and G″increase during the repeating frequency(ω)sweep,due to the gradual crystallization of hard *** indicates that the crystallites primarily restrain the relaxation of unit with large *** increments of G′and G″are weakened when the content of hard segment in TPU is *** TPU with high content of hard segments,a complete high elastic platform with a width of 3 orders of magnitude was observed only through one frequency scan test at medium T_(a).In addition,the crystallites of hard segments grow up continuously during frequency scan test(isothermal annealing treatment)and cause the extreme increase in G′and G″withωin lowωregion.

关键词： Thermoplastic polyurethane Viscoelastic properties Annealing Crystalization

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Energy-absorbing porous materials:Bioinspired architecture and fabrication

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Nano Research 2024年第2期17卷 679-690页

作者： Junheng Zhao Meng Li Jiewei Chen Weiwei Gao Hao Bai State Key Laboratory of Chemical Engineering College of Chemical and Biological EngineeringZhejiang UniversityHangzhou 310058China Department of Polymer Science and Engineering Zhejiang UniversityHangzhou 310058China

Energy-absorbing materials are widely used in transportations,sports,and the military ***,porous materials,including natural and artificial materials,have attracted tremendous attentions due to their light weight and excellent energy absorption *** review summarizes the recent progresses in the natural and artificial energy-absorbing porous ***,we review the typical natural porous materials including cuttlebone,bighorn sheep horn,pomelo peel,and sunflower stem *** architectures,energy absorption abilities,and mechanisms of these typical natural materials and their bioinspired materials are ***,we provide a review on the fabrication methods of artificial energy-absorbing porous materials,such as conventional foaming and three-dimensional(3D)***,we address the challenges and prospects for the future development of energy-absorbing porous *** importantly,our review provides a direct guidance for the design and fabrication of energy-absorbing porous materials required for various engineering applications.

关键词： energy-absorbing porous materials natural materials natural structures bioinspired materials

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Synthesis of Sulfur/Selenium-containing Polyester with Recyclability and Controllable Hydrophilicity and Glass Transition Temperature

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Chinese Journal of polymer science 2023年第12期41卷 1836-1845,I0004,I0005页

作者： Wen-Jing Li Xiang-Qiang Pan Jian Zhu Zheng-Biao Zhang Jiangsu Key Laboratory of Advanced Functional Polymer Design and Application Department of Polymer Science and EngineeringCollege of ChemistryChemical Engineering and Materials ScienceSoochow UniversitySuzhou 215123China

We present a ring-opening polymerization of bridged cyclic lactone utilizing alcohol as the initiator and organic base as the *** γ-butyrolactone monomers(PhSGBL and PhSeGBL)were synthesized efficiently from commercially available 3-cyclohexene-1-carboxylic *** to the ring strain of the bridged structure,ring-opening polymerization of this type of γ-butyrolactone derivative was successfully carried out under mild conditions,e.g.,using ethylene glycol as the initiator and a commercial catalyst[1,5,7-triazabicyclo[4.4.0 dec-5-ene(TBD)]]as the catalyst at 30℃.The obtained polymer could be degraded to its monomer for recycling in the presence of ZnCl_(2) as a *** and PhSeGBL could also be copolymerized with ε-caprolactone to tune the glass transition ***,the hydrophilicity of the obtained sulfur-containing polymers could be adjusted by selectively oxidizing the thioether side group to sulfone/sulfoxide,which offered a way to tune the hydrophilicity of *** the other hand,the obtained selenium-containing compound could be degraded in the presence of m-CPBA(3-chloroperbenzoic acid),which offered potential application in sustained drug release.

关键词： Ring-opening polymerization Polyester Closed-loop recycling Selective oxidation

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"Weakly Adsorbed CO2 and H2O Species on Monoethanolamine Films in a Room-Temperature CO2 and Direct Air Capture Cycle: An In Situ Infrared Study"

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INDUSTRIAL & engineering CHEMISTRY RESEARCH 2024年第10期63卷 4742-4742页

作者： Oduntan, Aderinsola Chuang, Steven S. C. School of Polymer Science and Polymer Engineering Department of Chemical Biomolecular and Corrosion Engineering The University of Akron 200 E Buchtel Commons Akron Ohio 44325-3909 United States

The binding states of adsorbed CO2 species on monoethanolamine (MEA) thin films in a CO2 and direct air capture cycle at 25 °C have been studied by in situ infrared spectroscopy. CO2 adsorption produced two types of adsorbed CO2: (i) hydrogen-bonded ammonium carbamate, as strongly adsorbed CO2, which can only be removed by heating above 25 °C and (ii) carbamic acid, as weakly adsorbed CO2, which can be removed at room temperature from the MEA film. The infrared results suggest that carbamic acid is on an amine site, which is isolated by OH from neighboring MEA molecules and further clarify the sequence of the formation of adsorbed CO2. Weakly adsorbed CO2 and H2O species were observed for the first time on MEA and nonaqueous MEA thin films. Decreasing the concentration of CO2 from 100% to 420 ppm of CO2/1.5% H2O (atmospheric CO2) for direct air capture decreased the CO2 capture capacity and increased the adsorption half-time while the CO2 desorption half-time (i.e., rate) remained at the same level. Controlling the type and structure of adsorbed CO2 could be effective in bringing down the energy needed for the regeneration of amine solvents and sorbents through enhancing the density of amine sites for carbamic acid.

关键词： Adsorption Amines Noncovalent interactions Organic compounds Thin films

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Development of a radical polymerization algorithm for molecular dynamics simulations of antifreezing hydrogels with double-network structures

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npj Computational Materials 2023年第1期9卷 204-213页

作者： Yonglan Liu Dong Zhang Yijing Tang Xiong Gong Jie Zheng Department of Chemical Biomolecularand Corrosion EngineeringThe University of AkronAkronOHUSA School of Polymer Science and Polymer Engineering The University of AkronAkronOHUSA

The development and understanding of antifreezing hydrogels are crucial both in principle and practice for the design and delivery of new *** current antifreezing mechanisms in hydrogels are almost exclusively derived from their incorporation of antifreezing additives,rather than from the inherent properties of the polymers ***,developing a computational model for the independent yet interconnected double-network(DN)structures in hydrogels has proven to be an exceptionally difficult ***,we develop a multiscale simulation platform,integrating‘random walk reactive polymerization’(RWRP)with molecular dynamics(MD)simulations,to computationally construct a physically-chemically linked PVA/PHEAA DN hydrogels from monomers that mimic a radical polymerization and to investigate water structures,dynamics,and interactions confined in PVA/PHEAA hydrogels with various water contents and temperatures,aiming to uncover antifreezing mechanism at atomic *** simulation results indicate that the antifreezing property of PVA/PHEAA hydrogels arises from a combination of intrinsic,strong water-binding networks and crosslinkers and tightly crosslinked and interpenetrating double-network structures,both of which enhance polymer-water interactions for competitively inhibiting ice nucleation and *** computational findings provide atomic-level insights into the interplay between polymers and water molecules in hydrogels,which may determine their resistance to freezing.

关键词： freezing polymerization hydrogel

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Rapid and high-resolution 3D printing via photoacid generator induced cationic RAFT polymerization

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science China Chemistry 2025年第05期68卷 2010-2016页

作者： Bowen Zhao Jiajia Li Chongyang Yang Xiangqiang Pan Zhengbiao Zhang Jian Zhu State Local Joint Engineering Laboratory for Novel Functional Polymeric Materials Jiangsu Key Laboratory of Advanced Functional Polymer Design and ApplicationSuzhou Key Laboratory of Macromolecular Design and Precision SynthesisDepartment of Polymer Science and EngineeringCollege of ChemistryChemical Engineering and Materials ScienceSoochow University

Vinyl ethers, while being typical monomers for living cationic polymerization, have limited commercial use due to the poor mechanical properties of their polymers at room temperature. We explored the use of photoacid generators to induce cationic reversible addition-fragmentation chain transfer（RAFT） polymerization for the rapid high-resolution three-dimensional（3D） printing of various vinyl ethers. The process demonstrated controlled molecular weights and narrow molecular weight distributions（MWD）, with monomer conversions exceeding 90% in minutes. Incorporating a crosslinker enabled 3D printing at speeds up to 8.46 cm h-1with layer thicknesses as thin as 50 μm. The mechanical properties of the printed objects were tunable by adjusting resin components, allowing for a range of material characteristics from brittle to elastomeric（tensile strength ranging from 13.9 to 31.7 MPa, Young's modulus ranging from 185.6 to 992.7 MPa and elongation at break ranging from 2.8%to 68.3%）. Moreover, polymer welding facilitated the creation of gradient materials, showcasing the potential for engineered applications of poly（vinyl ethers）(PVEs).

关键词： 3D printing cationic RAFT polymerization vat photopolymerization vinyl ether

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Facile Synthesis of Polycarbonate Diol via Copolymerization of CO_(2) and Cyclohexene Oxide Catalysed by a Combination of One-Component Phosphonium Borane Lewis Pair and Water

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Chinese Journal of polymer science 2023年第5期41卷 735-744,I0009页

作者： Xiao-Wu Wang Ji-Wen Hui Yu-Tao Li Yan-Ru Gu Zhi-Bo Li State Key Laboratory Base of Eco-Chemical Engineering/College of Chemical Engineering Qingdao University of Science and TechnologyQingdao 266042China Key Laboratory of Biobased Polymer Materials Shandong Provincial Education Department/School of Polymer Science and EngineeringQingdao University of Science and TechnologyQingdao 266042China

Well-defined polycarbonate diol was successfully synthesized through a strategy using a combination of organocatalyst and *** strategy was less developed in organocatalyzed polymerization and frequently regarded as side ***,one-component phosphonium borane Lewis pairs PB1-PB8 were successfully applied in the copolymerization of CO_(2) and cyclohexene oxide(CHO)to generate poly(CHO-alt-CO_(2))carbonate(PCHC).Parameters of linker length and counter anion effects on the catalyst activity were *** was found that Lewis pair PB3 served as a dual initiator and catalyst in the copolymerization of CHO and CO_(2) with or without the presence of *** contrast,Lewis pair PB8 can serve as a true catalyst for the preparation of well-definedα,ω-hydroxyl PCHC *** was achieved by introducing a labile CF3COO group as counter anion through anion exchange reaction while water molecules acted as chain transfer *** function of trifluoroacetate group in the polymerization process was investigated in detail and possible mechanism was *** changing the amount of water and catalyst loading,PCHC diols with varied molecular weight(1.5 kg/mol to 7.5 kg/mol),low dispersities(D<1.2)and carbonate content(>99%)could be easily *** low molecular weight PCHC diol was used as a bifunctional macroinitiator for the ring-opening polymerization of L-lactide(LLA)to afford ABA triblock copolymer in one-pot synthesis.

关键词： Polycarbonate Phosphonium borane Lewis pair CO_(2)utilization Organocatalysis Ring-opening polymerization

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