JOURNAL OF POWER SOURCES
·
2022
·
IF 9.794
Yali Wang,Kexin Qi,Nanxi Dong,Bingxue Liu,Guofeng Tian,Shengli Qi,Dezhen Wu
High voltage operation of LiNi 0.8 Co 0.1 Mn 0.1 O 2 (NCM) for high energy density lithium-ion batteries has poor cycling performance, due to the unstable cathode-electrolyte interface. Herein, two functional polyimides (PIs), one polyimide with hydroxyl group is abbreviated as PI-OH and the other polyimide with carboxyl group is abbreviated as PI-COOH, are designed to contain hydroxyl , carboxyl, trifluoromethyl and ether groups and used as cathode binder, which allows a strong hydrogen bond interaction, abundant chemical bonding sites, superior electrochemical oxidation resistance , and excellent flexibility. Experimental results reveal that both PI-OH and PI-COOH binders show the impressive efficiency on improving the cathode-electrolyte interface stability and long-term cyclability. Especially, the NCM cathode using PI-COOH binder exhibits the highest cyclability (205 mAh g −1 at 40 mA g −1 with 73% capacity retention after 100 cycles at 4.7 V), contrasting to NCM cathode with commonly-used polyvinylidene fluoride (PVDF) binder (208 mAh g −1 with 34% capacity retention). Furthermore, the fully-charged NCM cathode with PI-COOH binder releases the less heat than the NCM/PVDF cathode during high-temp treatment to 300 °C, demonstrating the superiority of polyimide binders in improving the safety of the cathode materials .
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高影响因子
JOURNAL OF POLYMER RESEARCH
·
2017
·Vol. 24
·期 3
·1-11
·
IF 1.615
Wang Ning,Chen Yang,Ren Jianyu,Huang Xiongyi,Chen Xueyan,Li Guodong,Liu Dongqin
Dodecylbenzene sulfonic acid (DBSA) doped-polyaniline (PANI) coated conductive polyimide (PI) microfiber membrane was prepared by chemical oxidation polymerization. PI nanofiber membrane was prepared by solution blowing. Fourier transform infrared spectra (FTIR), X-ray photoelectron spectroscopy (XPS) and scanning electron microscope (SEM) proved that the successful preparation of composite microfiber membrane with core-shell structures. At the same time, the PANI had an effect of protection on PI nanofiber, which was detected by thermal gravimetric analysis (TGA). The orthogonal experiments were designed to determine the optimal reaction conditions for the conductivity of PANI/PI microfiber membranes as following: ANI concentration (0.15 mol L −1 ), APS concentration (0.1 mol L −1 ) and DBSA concentration (0.3 mol L −1 ). The conductivity of PANI/PI microfiber membranes could arrive to 3.83 × 10 −2 S cm −1 . Moreover, the PANI/PI microfiber membranes had a superior hexavalent chromium (Cr (VI)) adsorption performance. The factors affecting the performance of hexavalent chromium (Cr (VI)) removal from the aqueous solutions were investigated.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2022
·
IF 7.139
Jinchao Li,Jun Long,Wenheng Huang,Wenjie Xu,Jun Liu,Huan Luo,Yaping Zhang
A series of novel branched sulfonated polyimide (bSPI-x) membranes with 8% branched degree are developed for application in vanadium redox flow battery (VRFB). The sulfonation degrees of bSPI-x membranes are precisely regulated for obtaining excellent comprehensive performance. Among all bSPI-x membranes, the bSPI-50 membrane shows strong vanadium permeability resistance, which is as 8 times as that of commercial Nafion 212 membrane. At the same time, the bSPI-50 membrane has remarkable proton selectivity, which is four times as high as that of Nafion 212 membrane. The bSPI-50 membrane possesses slower self-discharge speed than Nafion 212 membrane. Furthermore, the bSPI-50 membrane achieves stable VRFB efficiencies during 200-time charge-discharge cycles at 120–180 mA cm −2 . Simultaneously, the bSPI-50 membrane exhibits excellent capacity retention compared with Nafion 212 membrane. All results imply that the bSPI-50 membrane possesses good application prospect as a promising alternative separator of VRFB.
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POLYMER
·
2025
·
IF 4.5
Long Ni,Lu Shen,Cuiqing Zhou,Yinfu Luo,Liwei Yan,Shuang Xia,Mei Liang,Shengtai Zhou,Huawei Zou
This work reports the flexible, hydrophobic and thermal insulative polyimide foams (PIFs) with anisotropic pore structure for potential application in high-tech fields. Polyester ammonium salt (PEAS) precursor powders with fluorinated groups were prepared by co-polymerization process and they were foamed using microwave-assisted foaming strategy. The introduction of 6FDA increased chain rigidity and decreased the melt viscosity of PEAS, which improved the foaming behavior of PEAS and the properties of subsequent PIFs. The PIFs had low density (18.61 kg/m 3 ), high open cell rate (99.0%) and flexibility (compression response rate>97%), excellent thermal resistance (T g = 292.9 °C) and thermal stability (T 5 % = 550.1 °C). Benefiting from the “bottom-up” directional foaming behavior, anisotropic pore structures were constructed in-situ and the fluorinated PIFs exhibited anisotropic mechanical, thermal insulation performance and hydrophobic behavior. The thermal conductivity of PIFs reached 0.0269 W/(m·K) in the horizontal direction (perpendicular to pore growth direction). The top surface temperature of PIFs was 67.8 °C after being heated on a 200 °C preheated hot plate for 30 min, exhibiting superior thermal insulation. The PIFs possessed exceptional hydrophobicity with a water contact angle as high as 131.7° and water absorption rate as low as 0.65 g/g. The flexible, hydrophobic and thermal insulative PIFs demonstrates promising application for long-term use in high-tech fields such as aerospace, transportation, construction and nuclear among others.
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高影响因子
TALANTA
·
2025
·
IF 6.1
Lan Yu,Linru Bai,Jiawen Liu,Jeirui Yang,Shuang Meng,Tong Yang,Yun-Hui Yang,Rong Hu
Unintended leakage of toxic and lead ion (Pb 2+ ) ions poses high harmful to human health and environment, hence its monitoring and detection is of utmost significance. Here, we developed a covalent organic framework (COFs) that was first synthesized by condensation of monomers 4,4',4''-(1,3,5-triazine-2,4,6-triyl) triphenylamine (TTA) and perylene-3,4,9,10-tetracarboxylic dianhydride (PTCA), and then fluorescence/smartphone dual-mode point-of-care testing (POCT) platform based on COFs combined with machine learning was successfully constructed to detect Pb 2+ . The morphology, chemical structure, fluorescent properties, sensing competition and selectivity behaviors of COFs-Pb 2+ were systematically analyzed. Additionally, the synthesized COFs can also function as a fluorescence-quenching sensor for Pb 2+ detection, leveraging the synergistic effects of fluorescence resonance energy transfer (FRET), the photoinduced electron transfer (PET), and dynamic quenching effect collectively, enable the sensor to achieve a wide linear detection range from 0.1 nM to 1 μM, with an impressive detection limit of 50 pM. This limit is well below the permissible threshold of 15 μg L -1 set by the United States Environmental Protection Agency (EPA). Notably, in contrast to liquid-phase sensors, swab-based sensors were successfully employed for Pb 2+ detection. The sensor also demonstrated reliable performance in actual water samples, yielding satisfactory recovery rates. This work introduces a novel approach to utilizing COFs with enhanced luminescent properties, offering significant potential for environmental monitoring applications.
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PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Zhicai Yu,Xueru Qu,Mi Zhou,Md Hasib Mia,Lin Hou,Yudong Wang,Jie Xu,Lele Huang,Liulu Zhang,Qianyu Zeng,Hualing He
The rapid advancement of flexible electronics imposes escalating demands on high-performance thermoelectric materials, particularly in extreme environments such as fire rescue operations, where mechanical stability and multifunctionality must be synergistically integrated. This study, developed a polyimide (PI)-based core sheath thermoelectric fiber (PT-SCF) with adjustable pore networks using non-solvent induced phase separation assisted coaxial wet spinning technique. The fiber sheath layer uses PI as the substrate, and polyvinyl alcohol (PVA) as the pore regulator agent to regulate the pore size (∼1.77–3.23 µm), while the introduction of 2D MXene nanosheets endowed the fiber with the ability of temperature sensing (maximum output voltage of 7.9 mV). The fiber core layer combines thermoplastic polyurethane (TPU) and ultraviolet (UV) photosensitive materials (UVs) to achieve fiber damage detection through a UV light-driven mechanism. The optimized PT-SCF has excellent mechanical properties (4.1 MPa, (R-R 0 )/R 0 < 10 %) and flame retardancy (LOI≈37.4 %). Its thermoelectric conversion efficiency is outstanding, with a linear positive correlation between output voltage and temperature (R 2 = 0.99). In addition, the PT-SCF realizes fast high-temperature warning in 1.6 s. Its integration with a multi-level temperature threshold high-temperature warning system highlights its potential for applications in smart fire-fighting systems and wearable electronic devices. This work presents a novel approach for designing and developing multifunctional thermoelectric fibers tailored to various harsh environments.
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2020
·
IF 3.99
Hanjun Wu,Weijun Zhang,Huali Zhang,Yi Pan,Xiaofang Yang,Zhiquan Pan,Xuejun Yu,Dongsheng Wang
In this work, the novel graphitic carbon nitride (g-C 3 N 4 ) and porous polyimide (PI) supported calcined hydrotalcite-like compounds (g-C 3 N 4 @PI@CHTLcs) were synthesized by co-precipitation and hydrothermal synthesis method, and systematically characterized by physical and chemical methods . The composites showed layered structure and a high thermal stability, and performed well in adsorption of tetracycline (TL), 2, 4-dichlorophenol (DP) and glyphosate (GH). The action pH value was ranged from 7 to 9 for TL and GH, and 3–9 for DP, respectively. The adsorption of TL and DP by g-C 3 N 4 @PI@CHTLcs conforms to the pseudo-first-order kinetic model . While for GH, the kinetic data fit well with pseudo-second-order model, indicating chemical adsorption via electrostatic interaction mechanism. Freundlich isothermal could better describe the adsorption process of TL, DP and GH. The maximum adsorption amounts of TL, DP and GH based on Langmuir isotherm model at 298 K were 231.1, 185.05 and 177.34 mg g −1 , respectively. The adsorption processes of TL, DP and GH were all endothermic and spontaneous, and showed excellent repeatability and stability in regeneration experiments. Additionally, the presence of chloride ion and humic acid (HA) showed no obvious effects on the adsorption process of organic contaminants. The diffusion mechanism of TL, DP and GH on the adsorption process was liquid membrane control. The adsorption mechanism might be the ion exchange between the layers of hydrotalcite, and the surface complexation and hydrogen bonding between various groups of PI and organic contaminants. The research showed that g-C 3 N 4 @PI@CHTLcs was effective in treatment of water containing various organic pollutants .
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高影响因子
APPLIED PHYSICS LETTERS
·
2013
·Vol. 102
·期 25
·
IF 3.794
Zhou Yongcun,Bai Yuanyuan,Yu Ke,Kang Yan,Wang Hong
A polymer based composite was prepared by using modified aluminum fibers and aluminum nanoparticles as fillers in polyimide matrix that resulted in the high thermal conductivity and low relative permittivity. It was found that silica coated aluminum fibers with the multilayer coating structures can significantly reduce the relative permittivity (about 19.6 at 1 MHz) of the composite while keeping lower dielectric loss (0.024 at 1 MHz). The thermal conductivity of composites was significantly increased to 15.2 W/m K. This work shows a useful way to choose proper modifier fillers to improve the composite properties for electronic packaging composite materials.
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高影响因子
TRIBOLOGY INTERNATIONAL
·
2025
·
IF 6.9
Wenbo Zhang,Rui Yu,Yuwei Cheng,Xinlei Gao
In this study, 38 organic compounds were used as lubricants in the GCr15 steel/polyimide (PI) friction system to systematically compare the influence mechanism of lubricant molecular structures on the friction performance of the system. Quantitative structure tribo-ability relationship (QSTR) models linking structural descriptors with coefficients of friction were established using random forest (RF) and extreme gradient boosting (XGBoost) algorithms, respectively. Based on comparisons of performance metrics such as fitting degree and generalization ability, the QSTR model developed by the RF algorithm was selected to quantitatively analyze the nonlinear influence mechanism of lubricant molecular structures on coefficients of friction. The study preliminarily reveals that the ability of lubricant molecules to form hydrogen bonds with PI macromolecules, the strength of van der Waals forces, and the influence of molecular geometric conformation on the effective interfacial interaction distance collectively constitute the key factors affecting the friction performance of the system.
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高影响因子
NANOTECHNOLOGY
·
2022
·Vol. 33
·期 40
·405205
·
IF 3.953
Dezhi Wu,Xianshu Cheng,Zhuo Chen,Zhenjin Xu,Minjie Zhu,Yang Zhao,Rui Zhu,Liwei Lin
Flexible force sensors are of great interest in the fields of healthcare, physiological signals, and aircraft smart skin applications because of their compatibility with curved surfaces. However, the simultaneous detection of multidirectional forces remains an engineering challenge, despite the great progress made in recent years. Herein, we present the development of a flexible capacitive force sensor capable of efficiently distinguishing normal and sliding shear forces. A two-layer electrospun polyimide/graphene oxide (PI/GO) nanofiber membrane is used as the dielectric layer, which is sandwiched between one top electrode and four symmetrically distributed bottom electrodes. This composite membrane has an improved dielectric constant, a reduced friction coefficient, and good compressibility, leading to superior performance that includes high sensitivity over a wide operational range with measured results of 3 MPa−1 for 0–242 kPa (0–2.2 N) and 0.92 MPa−1 for 242–550 kPa (2.2–5 N) in the normal direction; and better than 1 N−1 for 0–3 N in the x- and y-axis directions. The system also has a low detection limit of 10 Pa, fast response and recovery times of 39 ms and 13 ms, respectively, a good cyclic stability of 10,000 cycles at a pressure of 176 kPa, and promising potential for use in high-temperature environments (200 °C). Moreover, a prototype 4 × 4 sensor array has been fabricated and successfully used in a robotic system to grasp objects and operate a wireless toy car. As such, the proposed system could offer superior capabilities in simultaneous multidirectional force sensing for applications such as intelligent robots, human–machine interaction, and smart skin.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2026
·
IF 9.6
Zhengyu Wei,Lingzhe Meng,Xue Qin,Wei Han,Yiting Shi,Xuelin Gong,Faheem Naseem,Wei Wei
Organic cathode materials suffer from low electrical conductivity, sluggish ion transport, and poor accessibility of active sites, which severely restrict their practical application in sodium-ion batteries (SIBs). Herein, we realize the simultaneous regulation of spatial and electronic structures of polyimide (PI) via polyoxometalate molecular engineering. The covalently anchored PMA (phosphomolybdic acid) clusters expose abundant C O groups with enhanced redox kinetics and create continuous charge transfer channels across the PI-PMA heteromolecular interface, thereby facilitating electron transport and improving electrode conductivity. Moreover, the strong electron-withdrawing nature of PMA significantly lowers the LUMO level of PI, which not only strengthens the binding affinity between carbonyl groups and Na + to enhance reversible capacity, but also elevates the discharge voltage plateau to substantially boost the energy density of the composite. Consequently, the PI-PMA electrode exhibits high reversible capacity, superior rate capability, and excellent long-term cycling stability. This work establishes a multi-scale molecular engineering paradigm for overcoming the intrinsic limitations of organic cathodes for high-energy-density SIBs. Download: Download high-res image (152KB) Download: Download full-size image
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高影响因子
Journal of Environmental Chemical Engineering
·
2026
·Vol. 14
·期 5
·124243
·
IF 7.5
Yuanyuan Xu,Yunhua Lu,Pengwei Lv,Guoyong Xiao,Tonghua Wang,Lin Li
Interfacial defects between fillers and polymer matrix restrict the separation performance of mixed matrix membranes (MMMs). Herein, low-order polyimide (PI)-based covalent organic frameworks (COFs) fabricated from 2,4,6-tris(4-aminophenyl)-1,3,5-triazine (TAPT) and pyromellitic dianhydride (PMDA) were firstly adopted as fillers to modify thermally rearranged (TR) membranes. Distinct from highly crystalline COFs, low-order PI-COFs contain more exposed terminal reactive groups. These functional groups can form covalent linkages with poly(amic acid) precursors, which effectively suppresses the generation of non-selective interfacial voids and improves the interfacial compatibility between filler and polymer matrix. The hierarchical pores of PI-COFs construct low-resistance gas transport pathways, and triazine/imide polar sites deliver strong affinity for CO 2 . After thermal rearrangement at 450 °C, TR/COFs-2.3 achieves drastically boosted permeabilities: 4632 Barrer (CO 2 ), 3867 Barrer (H 2 ), 795 Barrer (O 2 ) and 215 Barrer (N 2 ). Its CO 2 /N 2 selectivity slightly increases to 21.54, while O 2 /N 2 and H 2 /N 2 selectivities moderately decline to 3.70 and 17.99. This membrane exceeds the 2008 Robeson upper bound for H 2 /N 2 , and nearly reaches the limit for CO 2 /N 2 and O 2 /N 2 . It also displays improved long-term aging stability (66–74% permeability retention after 180 days, versus 52% for neat TR membrane) and stable performance in a 6-day continuous mixed-gas test. This work proposes a low-order COF interfacial modification strategy to alleviate interfacial defects, providing a practical route to prepare high-performance TR-based MMMs.
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高影响因子
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