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Switchable polymerization from Monomer Mixtures to Synthesize Oxygen-Rich Block Copolymers with Dual Recyclability and Degradability

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Angewandte Chemie 2025年

作者： Di Xie Zhi-Hua Jia Yan-Li Zhang Xin-Lei Cai Long-Nv Liu Prof. Guan-Wen Yang Prof. Xiaohui Kang Prof. Xianming Zhang Prof. Yao-Yao Zhang National Engineering Laboratory for Textile Fiber Materials and Processing Technology (Zhejiang) School of Materials Science and Engineering Zhejiang Sci-Tech University Hangzhou 310018 China Department of Polymer Science and Engineering Zhejiang University Hangzhou 310027 China College of Pharmacy Dalian Medical University Dalian 116044 China

Switchable catalysis from monomer mixtures has been emerging as a powerful technique to synthesize various useful block copolymers, yet represents a significant challenge in polymer chemistry. Herein, we present the synthesis of well-defined polyacetal/polycarbonate block copolymers through switchable polymerization from mixtures of terminal epoxides, internal epoxides, o -phthalaldehyde (OPA) and CO 2 . The exclusive chemoselectivity of terminal epoxide or internal epoxide was achieved by controlling the reaction atmosphere. The dynamic equilibrium of acetal anion and alkoxy anion is the key to the successful switch from terminal epoxides/OPA copolymerization to internal epoxides/CO 2 copolymerization. Computational studies elucidated the kinetic and thermodynamic preferences underlying this selective polymerization. The acid/base labile nature of the block copolymers enables their sequence-controlled chemical recycling/degradation. These novel polyacetal/polycarbonate block copolymers with facilely sequence-controlled polymerization/depolymerization capabilities will enable their further tailored applications and contribute to the development of a circular plastic economy.

关键词： switchable polymerization block copolymer epoxide sequence control selective depolymerization

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A Low-cost, Easy-to-Fabricate, and Environmentally Friendly Composite Solid Electrolyte for Use in Lithium Metal Cells Paired with Lithium Iron Phosphate and Silicon

A Low-cost, Easy-to-Fabricate, and Environmentally Friendly ...

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fiber Society 2022 Fall Meeting and Technical Conference: 80 Years of Excellence in Advancing Scientific Knowledge Pertaining to fibers and fiber Materials

作者： Orenstein, Raphael Dirican, Mahmut Cheng, Hui Chang, Liang Yan, Chaoyi Wang, Eric Zhiqi Zhang, Xiangwu Fiber and Polymer Science Program Department of Textile Engineering Chemistry and Science Wilson College of Textiles North Carolina State University RaleighNC United States

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Preparation of a graphene-loaded carbon nanofiber composite with enhanced graphitization and conductivity for biosensing applications

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RSC Advances 2015年第39期5卷 30602-30609页

作者： Li, Dawei Li, Guohui Lv, Pengfei Ullah, Naseeb Wang, Cheng Wang, Qingqing Zhang, Xiangwu Wei, Qufu Key Laboratory of Eco-Textiles Ministry of Education Jiangnan University Wuxi Jiangsu214122 China Fiber and Polymer Science Program Department of Textile EngineeringChemistry and Science North Carolina State University RaleighNC27695-8301 United States

A combined method of electrostatic adsorption and green reduction was successfully employed to synthesize graphene-loaded carbon nanofibers (G/CNFs). The graphene nanoflakes enhanced the degree of graphitization of CNFs. A mixture containing laccase (Lac), G/CNFs and Nafion was used to fabricate a novel biosensor. The G/CNFs facilitated the direct electron transfer between Lac and the modified electrode. A pair of apparently enhanced redox peaks was observed on the modified electrode. The biosensor was investigated using square wave voltammetry, and the biosensor displayed highly efficient electrocatalysis towards catechol with a detection limit of 20 nM (S/N = 3), a sensitivity of 13.5 μA μM-1, and a linear range from 1 × 10-7 to 2.86 × 10-6 M. Moreover, this new biosensor also showed good stability and selectivity, and was employed in measuring catechol concentration in a real water environment successfully. © 2015 The Royal Society of Chemistry.

关键词： Carbon nanofibers

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Functionalized three-arm poly(ε-caprolactone) maleic acid microspheres for controlled protein release

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American Journal of Drug Delivery 2005年第4期3卷 253-267页

作者： Wu, Da-Qing Zhang, Xiang-Zheng Chu, Chih-Chang Fiber and Polymer Science Program Department of Textiles and Apparel and Biomedical Engineering Program Cornell University Ithaca NY United States Fiber and Polymer Science Program Department of Textiles and Apparel and Biomedical Engineering Program Cornell University Ithaca NY 14853-4401 United States

Introduction: The objective of this work was to fabricate a novel class of protein carriers from double-bond-functionalized multiarm poly(ε- caprolactone) maleic acid (PGCLM) microspheres and to examine protein sustained-release profiles in vitro over a period of a few months. Methods: The double-emulsion technique was used to formulate terminal functionalized three-arm PGCLM microspheres having three different types of functional groups (-OH, -COOH, and -C = C-), and one of the functional groups (>C = < bonds) was used to formulate surface-crosslinked microspheres (NPGCLM). Ovalbumin (OVA) was used as a model protein for examining its release profiles from PGCLM and NPGCLM microspheres in 0.1M phosphate-buffered saline (PBS) at 37°C. These microspheres were also characterized in terms of their morphology, size distribution, and stability. Results: The mean size of fabricated microspheres ranged from 21.9μm to 51.1μm. An OVA protein was successfully encapsulated into these biodegradable PGCLM microspheres with loading efficiency ranging from 34.2% to 46% (w/w), depending on the ratio of PGCLM to polyvinyl alcohol (PVA) stabilizer. Depending on the polymer to PVA stabilizer ratio, the cumulative OVA release % (w/w) in 0.1M PBS at 37°C ranged from 30% to 40% within 50 days. We further demonstrated the availability of the functional >C = C< bonds on the surface of PGCLM microspheres, which we expect could be used for either covalent binding of bioactive agents or imparting different chemical characteristics onto the surface of the microspheres for broadening of their applications. Discussion/Conclusion: A method for the preparation of biodegradable microspheres from water/oil emulsion of multiarm and functionalized poly(ε-caprolactone) [PGCL, PGCLM, and NPGCLM] was reported as a potential means of developing injectable therapeutic formulations for drugs. The most unique aspect of these biodegradable microspheres is the availability of two functional groups (>C = C< bon

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Portable and digitally controllable system design for testing fiber-based materials' mechanical behaviors

Portable and digitally controllable system design for testin...

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fiber Society 2009 Fall Meeting and Technical Conference

作者： Aykut, Yakup Ulcay, Yusuf Isik, Ahmet Fatih Fiber and Polymer Science Textile Engineering NCSU RaleighNC27695-8301 United States Textile Engineering Uludag University Gorukle Bursa16059 Turkey

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Edge atomic Fe sites decorated porous graphitic carbon as an efficient bifunctional oxygen catalyst for Zinc-air batteries

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Journal of Energy Chemistry 2023年第8期83卷 602-611,I0014页

作者： Ruihui Gan Yali Wang Xiangwu Zhang Yan Song Jingli Shi Chang Ma Tianjin Municipal Key Lab of Advanced Fiber and Energy Storage Technology Tiangong UniversityTianjin 300387China Fiber and Polymer Science Program Department of Textile EngineeringChemistry and ScienceWilson College of TextilesNorth Carolina State UniversityRaleighNC 27695-8301uNITED sTATES CAS Key Laboratory of Carbon Materials Institute of Coal ChemistryChinese Academy of SciencesTaiyuan 030001ShanxiChina

The development of advanced bifunctional oxygen electrocatalysts for oxygen reduction and evolution reactions(ORR and OER) is critical to the practical application of zinc-air batteries(ZABs). Herein, a silica-assisted method is reported to integrate numerous accessible edge Fe-Nx sites into porous graphitic carbon(named Fe-N-G) for achieving highly active and robust oxygen electrocatalysis. Silica facilitates the formation of edge Fe-Nx sites and dense graphitic domains in carbon by inhibiting iron *** purification process creates a well-developed mass transfer channel for Fe-N-G. Consequently,Fe-N-G delivers a half-wave potential of 0.859 V in ORR and an overpotential of 344 m V at10 m A cm^(-2)in OER. During long-term operation, the graphitic layers protect edge Fe-Nx sites from demetallation in ORR and synergize with Fe OOH species endowing Fe-N-G with enhanced OER *** functional theory calculations reveal that the edge Fe-Nx site is superior to the in-plane Fe-Nx site in terms of OH* dissociation in ORR and OOH* formation in OER. The constructed ZAB based on Fe-N-G cathode shows a higher peak power density of 133 m W cm^(-2)and more stable cycling performance than Pt/C + RuO2counterparts. This work provides a novel strategy to obtain high-efficiency bifunctional oxygen electrocatalysts through space mediation.

关键词： Bifunctionality EdgeFe-Nxsites Oxygen catalysis Graphitic domains Zinc-air batteries

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Electrospun LATP /PAN composite fiber-based membrane for lithium-ion battery separators

Electrospun LATP /PAN composite fiber-based membrane for lit...

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2011 International Conference on Advanced fibers and polymer Materials, ICAFPM 2011

作者： Liang, Yinzheng Qiu, Yiping Zhang, Xiangwu Department of Textile Materials Science and Product Design College of Textile Donghua University Shanghai 201620 China Fiber and Polymer Science Program Department of Textile Engineering Chemistry and Science North Carolina State University Raleigh NC 27695-8301 United States

ISBN: (纸本)9787122120199

The lithium aluminum titanium phosphate (LATP)/Polyacrylonitrile (PAN) composite fiber-based membrane were prepared by electrospinning composite solution of LATP and PAN in N, N-dimethylformamide(DMF). The crystallization phase of the LATP particles were characterized by X-ray diffraction(XRD). The electrolyte uptakes of the electrospun LATP/PAN composite fiber-based membranes were also evaluated. In addition, the electrochemical performance of the liquid electrolyte-soaked electrospun LATP/PAN composite fiber-based is also improved after the introduction of LATP particles.

关键词： Electrospinning

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Li₂MnSiO₄/Carbon Composite Nanofibers as a High-Capacity Cathode Material for Li-Ion Batteries

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Soft Nanoscience Letters 2012年第3期2卷 54-57页

作者： Shu Zhang Ying Li Guanjie Xu Shuli Li Yao Lu Ozan Topracki Xiangwu Zhang Fiber and Polymer Science Program Department of Textile Engineering Chemistry and Science North Carolina State University Raleigh NC..Fiber and Polymer Science Program Department of Textile Engineering Chemistry and Science North Carolina State University Raleigh NC..Fiber and Polymer Science Program Department of Textile Engineering Chemistry and Science North Carolina State University Raleigh NC..Fiber and Polymer Science Program Department of Textile Engineering Chemistry and Science North Carolina State University Raleigh NC..Fiber and Polymer Science Program Department of Textile Engineering Chemistry and Science North Carolina State University Raleigh NC..Fiber and Polymer Science Program Department of Textile Engineering Chemistry and Science North Carolina State University Raleigh NC..Fiber and Polymer Science Program Department of Textile Engineering Chemistry and Science North Carolina State University Raleigh NC..

Li2MnSiO4 has an extremely high theoretical capacity of 332 mAh?g?1. However, only around half of this capacity has been realized in practice and the capacity retention during cycling is also low. In this study, Li2Mn... 详细信息

Li₂MnSiO₄ has an extremely high theoretical capacity of 332 mAh?g^?1. However, only around half of this capacity has been realized in practice and the capacity retention during cycling is also low. In this study, Li₂MnSiO₄/carbon composite nanofibers were prepared by a combination of electrospinning and heat treatment. The one-dimensional continuous carbon nanofiber matrix serves as long-distance conductive pathways for both electrons and ions. The composite nanofiber structure avoids the aggregation of Li₂MnSiO₄ particles, which in turn enhances the electrode conductivity and promotes the reaction kinetics. The resultant Li₂MnSiO₄/carbon composite nanofibers were used as the cathode material for Li-ion batteries, and they delivered high charge and discharge capacities of 218 and 185 mAh?g^?1, respectively, at the second cycle. In addition, the capacity retention of Li₂MnSiO₄ at the first 20th cycles increased from 37% to 54% in composite nanofibers.

关键词： Electrospinning Li2MnSiO4 Carbon Nanofibers Li-Ion Battery

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Reconfiguration and self-healing integrated Janus electrospinning nanofiber membranes for durable seawater desalination

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Nano Research 2023年第1期16卷 489-495页

作者： Huijie Liu Jiatai Gu Ye Liu Lei Yang Liming Wang Jianyong Yu Xiaohong Qin Key Laboratory of Textile Science&Technology of Ministry of Education College of TextilesDonghua UniversityShanghai 201620China State Key Laboratory for Modification of Chemical Fibers and Polymer Materials International Joint Laboratory for Advanced Fiber and Lowdimension MaterialsCollege of Materials Science and EngineeringDonghua UniversityShanghai 201620China Innovation Center for Textile Science and Technology Donghua UniversityShanghai 201620China

Janus electrospinning nanofiber membranes have attracted extensive attention in the fields such as solar-driven interfacial desalination,liquid filtration,and waterproof and breathable ***,the Janus structures suffer from weak interfacial bonding and vulnerability to damage,making the durability and sustainability are highly sought after in real-word ***,we fabricate the simply reconfigurable and entirely self-healing Janus evaporator by electrospinning polypropylene glycol based polyurethane(PPG@PU)and polydimethylsiloxane based polyurethane-CNTs(PDMS@PU-CNTs)with different wettability,which are both designed based on dynamic Diels–Alder(DA)*** interface of the Janus membrane is stitched by the covalent bonds to directly improve the interface adhesion to 22 N·m−1,constructing an integrated evaporator,and thereby achieving a stable desalination rate of 1.34 kg·m−2·h−1 under one *** dissociation of DA networks allows the evaporators for self-healing and reconfiguration abilities,after which the photothermal performance is *** is the first work for the crosslinked self-healing polymer to be directly electrospun,achieving the improved interfacial bond and reconfiguration of entire evaporators,which presented promising new design principles and materials for interfacial solar seawater desalination.

关键词： Janus nanofiber membrane electrospinning interfacial bonding solar steam generation seawater desalination

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Synthesis,characterization of a DOPO-based polymeric flame retardant and its application in polyethylene terephthalate

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Progress in Natural science:Materials International 2020年第2期30卷 200-207页

作者： Xiang Ao Ya Du Dan Yu Wei Wang Weizhong Yang Bin Sun Meifang Zhu State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and EngineeringDonghua University Key Laboratory of Science & Technology of Eco-Textile Ministry of EducationCollege of ChemistryChemical Engineering and BiotechnologyDonghua University Shanghai Different Chemical Fiber Co. Ltd

A high molecular weight DOPO-based flame retardant(DP-DE) containing phosphorus linked pendent groups was synthesized by a two-step esterification and polycondensation reaction,and characterized by Fourier transform infrared spectroscopy(FTIR),13C nuclear magnetic resonance(13C NMR) and gel permeation chromatography(GPC).After added into polyethylene terephthalate(PET) via melt-blending method,the flame retardancy of DP-DE were monitored by thermo-gravimetric analysis(TGA),limiting oxygen index(LOI) and underwriter laboratories(UL-94) *** results showed that DP-DE display good flame retardancy in *** the thermal stability,char residue yield and LOI values of the composites increased with the increase of DP-DE *** flame retarded mechanism of DP-DE was investigated by pyrolysis-gas chromatogram-mass(PY-GCMS),in situ FTIR,scanning electron microscope(SEM) and laser Raman spectroscopy(LRS).DP-DE was evidenced to release phosphorus acid and its derivatives,which catalyze carbonization and produce compact carbonaceous *** protecting the polymeric materials substrate from further degradation and inhibiting the pyrolysis degree,both the amount and thermal stability of carbonaceous layers of DP-DE were improved,and hence enhancing the flame retarded performance of PET/DP-DE composites.

关键词： High molecular weight DOPO-Based Flame retardant PET Mechanism

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