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cross-linked Electrospun Gel Polymer Electrolytes for Lithium-Ion Batteries

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Chinese Journal of Polymer Science 2024年第8期42卷 1021-1028页

作者： Xue Gong Qin Xiao Qing-Yin Li Wen-Cui Liang Feng Chen Long-Yu Li Shi-Jie Ren College of Polymer Science and Engineering State Key Laboratory of Polymer Materials EngineeringSichuan UniversityChengdu 610065China

Lithium-ion batteries(LIBs)benefit from an effective electrolyte system design in both terms of their safety and energy storage ***,a series of precursor membranes with high porosity were produced using electrospinning technology by mixing PVDF and triblock copolymer(PS-PEO-PS),resulting in a porous structure with good interconnections,which facilitates the absorbency of a large amount of electrolyte and further increases the ionic conductivity of gel polymer electrolytes(GPEs).It has been demonstrated that post-cross-linking of the precursor membranes increa ses the rigidity of the nanofibers,which allows the polymer film to be dimensionally sta ble up to 260℃while maintaining superior electrochemical *** obtained cross-linked GPEs(CGPEs)showed high ionic conductivity up to 4.53×10^(-3)S·cm^(-1).With the CGPE-25,the assembled Li/LiFeP04 half cells exhibited good rate capability and maintained a capacity of 99.4%and a coulombic efficiency of99.3%at 0.1 *** results suggest that the combination of electrospinning technique and post-cross-linking is an effective method to construct polymer electrolytes with high thermal stability and steadily decent electrochemical performance,particularly useful for Lithium-ion battery applications that require high-temperature usage.

关键词： Electrospinning cross-linked Gel polymer electrolytes Lithium-ion batteries

Characterization of Ionic Conducting cross-linked Polyether Electrolytes

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Journal of Wuhan University of Technology(Materials Science) 2005年第4期20卷 104-106页

作者：陈国荣 Department of Applied Chemistry Harbin Institute of Technology Harbin 150001 China

An appropriate amount of toluene 2,4-diisocyanate（TDI） was added into polyether（[（CH2CH2O）13 CH2O]n/Li salt electrolyte to form a cross-linked network,with improving the film proces sability and thermal *** relation between the structure and ioinc conductive properties of the cross-lined polyether electrolytes was investigated by means of Fourier transform infra-red spectroscopy（FTIR）,differential scanning calorimetry（DSC）,mechanical property and AC impedance *** electrolytes system is found to have two glass transitions,and it is found that the two Tgs increase with increasing salt *** the some Li salt concentration,the conductivity of cross-liked polyether/LiN（CF3SO2）2 complex system is higher than that of LiClo4,At EO/Li=25：1（mol ratio）,the former conductivity changes with temperature,while the later coincids with Arrhenius formula（σ=Ae^-Ea/RT）.The cross-linked polyether/LiN（CF3 SO2）2 electrolyte exhibits the maximum σ=10^-4.75S/cm at 30℃.

关键词： cross-linked polymer electrolyte ionic conductivity two glass transitions

Synthesis and Properties of Lactic Acid-based cross-linked Poly(ester-amide)

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Chinese Chemical Letters 2006年第5期17卷 645-648页

作者： Yue Ying HE Cong Ming XIAO College of Material Science and Engineering Huaqiao University Quanzhou 362021

A novel lactic acid-based cross-linked poly（ester-amide）（LCPEA） was synthesized. The gel fraction of the LCPEA could be modulated by the reaction conditions and it affected the mechanical and thermal properties of the LCPEA. The tensile strength, elastic modulus and bend strength of the LCPEA of 65% gel fraction were 4.65, 136.55 and 39.63 MPa, respectively. The thermal decomposition temperature （50 wt%） of the LCPEA was around 410℃.

关键词： Lactic acid cross-linked poly(ester-amide) synthesis properties.

In-situ polymerized cross-linked binder for cathode in lithium-sulfur batteries

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Chinese Chemical Letters 2020年第2期31卷 570-574页

作者： Heng Ye Danni Lei Lu Shen Bin Ni Baohua Li Feiyu Kang Yan-Bing He Shenzhen Geim Graphene Center Graduate School at ShenzhenTsinghua UniversityShenzhen 518055China Laboratory of Advanced Materials Department of Materials Science and EngineeringTsinghua UniversityBeijing 100084China

Volume expansion and polysulfide shuttle effect are the main barriers for the commercialization of lithium-sulfur(Li-S) *** this work,we in-situ polymerized a cross-linked binder in sulfur cathode to solve the aforementioned problems using a facile method under mild *** diol(PCDL),triethanolamine(TEA) and hexamethylene diisocyanate(HDI) were chosen as precursors to prepare the cross-linked *** in-situ polymerized binder(PTH) builds a strong network in sulfur cathode,which could restrain the volume expansion of sulfu ***,by adopting functional groups of oxygen atoms and nitrogen atoms,the binder could effectively facilitate transportation of Li-ion and adsorb polysulfide *** Li-S battery with bare sulfur and carbon/sulfur composite cathodes and cross-linked PTH binder displays much better electrochemical performance than that of the battery with *** PTH-bare S cathode with a mass loading of 5.97 mg/cm^2 could deliver a capacity of 733.3 mAh/g at 0.2 C,and remained 585.5 mAh/g after 100 *** in-situ polymerized binder is proved to be quite effective on restraining the volume expansion and suppressing polysulfide shuttle effect,then improving the electrochemical performance of Li-S battery.

关键词： cross-linked binder In-situ polymerization Volume expansion of sulfur Shuttle effect suppression Lithium-sulfur batteries

Molecular Dynamics Study on Hydrothermal Response of PNIPAM:From Single Chain to cross-linked Polymer

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Frontiers in Heat and Mass Transfer 2024年第6期22卷 1743-1760页

作者： Xianzhi Chen Dong Niu Hongtao Gao Mu Du Institute of Refrigeration&Cryogenics Engineering Dalian Maritime UniversityDalian116026China Institute for Advanced Technology Shandong UniversityJinan250061China Shenzhen Research Institute of Shandong University Shandong UniversityShenzhen518057China

Thermosensitive hydrogel can integrate vapor molecular capture,in-situ liquefaction,and thermal-induced water release for freshwater *** study aimed to examine the dynamic behavior of poly(N-isopropylacrylamide)(PNIPAM)single chain and cross-linking thermosensitive hydrogel through molecular dynamics ***,the impact of lower critical solution temperature(LCST)on the conformation of polymer chain and the interaction between water and polymer chain were also *** polymer chain conformation underwent a transition from coil to globule when the temperature exceeded the LCST,indicating the temperature responsiveness of ***,thermosensitive hydrogel samples with different cross-linking degrees(DOC)were studied,and relevant parameters such as the number of free water,the diffusion coefficient of water,and the pore size distribution were counted to evaluate the temperature responsiveness and water release characteristics of thermosensitive hydrogel.

关键词： Thermosensitive hydrogel water harvesting coil to globule cross-linked molecular dynamics simulation

Study on the Structure of Peroxide cross-linked Polyethylene Pipes with Several Stabilizers

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Materials Sciences and Applications 2013年第9期4卷 497-503页

作者： Hideo Hirabayashi Akinori Iguchi Kazushi Yamada Hiroyuki Nishimura Kazuhisa Ikawa Hidekazu Honma KRI. Inc. Osaka Japan Kyoto Institute of Technology Kyoto Japan Osaka Gas Co. Ltd. Osaka Japan Shinwa Sangyo Co. Ltd. Osaka Japan

cross-linked polyethylene (PEX) pipes used in hot water supply are required for high mechanical strength and high creep resistance at high temperature. Especially PEX-a pipes which are made by peroxide cross-linking have better performance, such as creep resistance and thermal shock resistance than the pipes made by the other cross-linking method. Because the PEX-a pipes indicate the higher cross-link degree as compared with the other PEX pipes. In this study, the PEX-a pipes which were mixed with several stabilizers were tested to evaluate the effects on cross-link degree and the oxygen induction time. And also they are evaluated with the chlorine aqueous solution by the performance of the long-term hydrostatic pressure test and the long-term hydro dynamic pressure test. As a result, it was found that the combination of antioxidants for PEX-a pipes plays an important role to prolong the oxygen induction time without inhibiting the cross-linking. From the results of the 1H pulsed NMR measurement over the melting point of polyethylene, it was found that each peroxide PEX pipe with different antioxidant combinations indicated the different proportion and crosslink density of cross-linked region, in addition, that these pipes had the effective structure of cross-linking for the hydrostatic and hydrodynamic pressure test with the chlorine aqueous solution. Therefore, it was considered to be useful results for studies of the stricture of cross-linking of polyethylene.

关键词： cross-linked Polyethylene PEX-a Peroxide Structure of cross-Linking

Study on Removal of Cr(VI)from Aqueous Solution by cross-linked Chitosan

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Journal of Environmental Science and Engineering(A) 2018年第1期7卷 1-7页

作者： Xiaoyu Du Yanling Deng Shunsuke Sekiguchi Naoto Miyamoto Naoki Kano Hiroshi Imaizumi Graduation School of Science and Technology Niigata UniversityNiigata 950-2181Japan Department of Chemistry and Chemical Engineering Faculty of EngineeringNiigata UniversityNiigata 950-2181Japan

In this paper,the adsorbent for the removal of hexavalent Cr(Chromium)from aqueous solutions has been prepared by modifying chitosan composite with EP(Epichlorohydrin)or GA(Glutaraldehyde).The modified cross-linked chitosan was characterized by SEM(Scanning Electron Microscopy)and FT-IR(Fourier Transform Infrared Spectroscopy).Batch adsorption experiments were carried out to evaluate the adsorption of Cr(VI)by the cross-linked chitosan under different ***,the sorption mechanism of Cr(VI)by the cross-linked chitosan was investigated by applying Langmuir and Freundlich isotherm equations to the data *** concentration of Cr in solution was determined by ICP-MS(Inductively Coupled Plasma Mass Spectrometry).The cross-linked chitosan can be an efficient sorbent for Cr(VI).

关键词： cross-linked chitosan EP(Epichlorohydrin) GA(Glutaraldehyde) hexavalent Cr(Chromium) adsorption isotherms kinetics

Disulfide cross-linked Low Generation Dendrimers With Low Cost,Cytotoxicity,and High Gene Delivery Efficiency

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Disulfide Cross-linked Low Generation Dendrimers With Low Co...

Semi-interpenetrating network anion exchange membranes based on quaternized polyvinyl alcohol/poly(diallyldimethylammonium chloride)

2012年全国高分子材料科学与工程研讨会

作者：刘红梅王辉杨雯隽程义云 Shanghai Key Laboratory of Regulatory Biology School of Life ScienceEast China Normal University

Cationic poly（amidoamine）（PAMAM） dendrimers were widely used as non-viral gene carriers[1].PAMAM dendrimer-based product Superfect? was already commercially available gene transfection ***,these products are based on high generation dendrimers with high cost and serious cytotoxicity[2,3].In this study,we prepared high efficient gene carriers using disulfide cross-linked generation 2（G2） PAMAM dendrimers. These disulfide cross-linked G2 dendrimer may degrade into G2 dendrimer after their localization in the endosome of the cancer *** can effectively condense DNA into -200 nm *** to G5 PAMAM dendrimer,disulfide cross-linked G2 PAMAM dendrimer showed much improved gene transfection efficiency（both GFP gene and luciferase） and reduced cytotoxicity in both 293T and HeLa cell lines（Figure 1）.The disulfide cross-linked G2 dendrimer prepared at a linker/dendrimer 1:1 molar ratio showed the highest gene delivery efficiency and exhibited comparable transfection efficiency to branched 25 kD PEI,a commercially available non-viral gene *** laser scanning microscope （CLSM） studies further revealed the high cellular uptake behavior of disulfide cross-linked G2 PAMAM dendrimers and partial dendrimers were observed in cell nucleus,suggesting the degradation of disulfide cross-linked dendrimers into G2 dendrimers with small size and low *** study have demonstrated that disulfide cross-linked low generation dendrimers with low cost,cytotoxicity,and high transfection efficiency are efficient alternatives to high generation dendrimers in gene *** can further improve the delivery efficiency of these promising materials by surface modification of low generation dendrimers with targeting moieties,amino acids,sugars and followed by disulfide cross-linking[4].

关键词： dendrimer PAMAM gene delivery disulfide cross-linked

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Green Energy & Environment 2021年第5期6卷 743-750页

作者： Xinming Du Hongyu Zhang Yongjiang Yuan Zhe Wang College of Chemical Engineering Changchun University of TechnologyChina School of Materials Science and Engineering Changchun University of TechnologyChina Advanced Institute of Materials Science Changchun University of TechnologyChangchun130012China

The semi-interpenetrating network anion exchange membranes(AEMs)based on quaternized polyvinyl alcohol(QPVA)and poly(-diallyldimethylammonium chloride)(PDDA)are *** chemical cross-linking structure is formed between hydroxyl groups of QPVA and aldehyde groups of glutaraldehyde(GA),which makes PDDA more stable embed in the QPVA matrix and also improves the mechanical properties and dimensional stability of *** to the phase separation phenomenon of AEMs swelling in water,a microporous structure may be formed in the membrane,which reduces the transmission resistance of hydroxide ions and provides a larger space for the transfer of hydroxide ions,thus improving the *** ring structure of PDDA is introduced as a cationic group to transfer hydroxide ions,and shields the nucleophilic attack of the hydroxide ions through the steric hindrance effect,which improves alkaline *** hydroxide conductivity of semi-interpenetrating network membrane(QPVA/PDDA0.5-GA)is 36.5 mS cm^(-1) at 60℃.And the membrane of QPVA/PDDA0.5-GA exhibits excellent mechanical property with maximum tensile strength of 19.6 *** immersing into hot 3 mol L^(-1) NaOH solutions at 60℃ for 300 h,the OHconductivity remains 78%of its initial *** semi-interpenetrating network AEMs with microporous structure exhibit good ionic conductivity,mechanical strength and alkaline durability.

关键词： Anion exchange membrane Semi-interpenetrating network cross-linked Microporous structure