Journal of Water Process Engineering
·
2025
·
IF 6.7
Xiaolei Wang,Jingguo Zhang,Jing Feng,Shurui Han,Chan Huang,Zhiyun Kong,Huicai Wang
An organic solvent nanofiltration (OSN) membrane was fabricated through interfacial polymerization (IP) to form a selective layer containing hydrophilic amide (–CONH–) and hydrophobic trifluoromethyl (–CF 3 ) groups on a polyimide (PI) substrate. Piperazine (PIP) and 5-trifluoromethyl-1,3-phenylenediamine (TFMPD) were employed as aqueous phase monomers, reacting with trimesoyl chloride (TMC) in the organic phase. The effects of TFMPD incorporation on the chemical structure, morphology, surface properties, separation performance, and stability of the membranes were systematically investigated. The results revealed that the competitive reaction between TFMPD and PIP led to a thinner selective layer with reduced cross-linking degree, thereby enhancing solvent permeance while maintaining consistent pharmaceutical rejection. Specifically, the introduction of –CF 3 groups improved non-polar solvent transport, achieving a 3.2-fold increase in n-hexane permeance. After 91 days of immersion in N , N -dimethylformamide (DMF), the membrane retained ~94 % rifampicin (RFP) rejection and maintained an ethanol/water permeance of ~4.5 L·m −2 ·h −1 ·bar −1 . This work demonstrates a rational design strategy for developing solvent-resistant OSN membranes with balanced permeability-selectivity-stability for pharmaceutical separation in organic solvents.
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Journal of Materials Chemistry A
·
2025
·
IF 9.5
Mohamed A. Elnaggar,Nanxi Dong,Yongjun Kang,Bingxue Liu,Daolei Lin,Guofeng Tian,Shengli Qi,Dezhen Wu
Polyimide cathode materials have enticed tremendous attention as alternatives to transition-metal electrodes owing to their large theoretical capacity, structural diversity, low cost, and rapid reaction kinetics. Conversely, such imide electrodes still face a severe challenge to achieve their energy storage applications satisfactorily due to the insufficient utilization of their redox-active sites originating from their low electronic conductivities. Herein, four functionalized polyimide composites have been fabricated by virtue of an in situ polycondensation reaction between a newly synthesized benzophenone–benzoquinone-based diamine and commercial dianhydrides in the presence of a conductive Super C45 material for application as cathode materials in Li-ion batteries. Such innovative integration of carbonyl groups of benzophenone, benzoquinone, and diimide rings with the Super C45 material not only creates a stable porous structure with abundant accessible redox-active sites but also guarantees fast electron/ion diffusion. Consequently, our targeted PMQP-SP cathode delivers high capacities of 143 mA h g−1 at 0.2C and 122 mA h g−1 at 1C and attains better rate capability besides ultra-stable cycling performance with 85% capacity retention over 500 cycles at 2C. According to DFT calculations, the theoretical results are well consistent with the electrochemical performance of the synthesized composites. Generally, this work suggests an efficient strategy to design novel carbonyl-rich organic electrodes for next-generation green rechargeable batteries.
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LANGMUIR
·
2024
·
IF 3.7
Luyi Xiao,Yu Yuan,Wei Ding,Yong Wang,Li-Ping Lv
Covalent organic frameworks (COFs) possessing a well-defined structure and abundant functional groups are prospective pseudocapacitive electrode materials. However, their intrinsic poor electrical conductivity and stacking problems usually impede the utilization of their active sites. Herein, we conduct an in situ growth of polyimide COFs (donated as NTDA COFs) enriched with carbonyl groups on multiwalled carbon nanotubes (MWCNTs). An impressive capacitance of 467 F g–1 at 1 A g–1 is achieved for the as-prepared NTDA/MWCNTs composite, significantly surpassing both the pure MWCNTs (60.3 F g–1) and NTDA COFs (284.4 F g–1). No decay of capacitance is observed after 10,000 cycles at 10 A g–1. The assembled device NTDA/MWCNTs//activated carbon reaches a high energy density of 17 Wh kg–1 at 750 W kg–1 while keeping superior charging/discharging stability of 89.5% after cycling for 19,000 times at 10 A g–1. In situ Fourier transform infrared (in situ FT-IR) tests together with the exploration of electrode kinetics show that the boosted capacitance of NTDA/MWCNTs is mainly donated by the redox reactions of carbonyl groups on NTDA COFs, which is largely activated by MWCNTs.
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PubMed
高影响因子
POLYMER
·
2024
·
IF 4.1
Guojiang Wen,Wenrui Cai,Shanshan Lv,Ting Hu,Jiarui Yang,Zhongfeng Ji,Hua Li,Shan Wang,Ziyu Zhao,Xuewei Fu,Yu Wang
The microstructures and thermal stability of separators are critical for the safety and performance of lithium-ion batteries ; however, it is still challenging to fabricate advanced separators simultaneously achieving uniform and high-throughput interconnected microporous structures with high thermal stability. Here, based on a soluble polyimide (PI) with high thermal stability, we report a microfluid-on-microfluid phase separation strategy (MF 2 -PS) to address the above challenge. Compared to the traditional non-solvent induced phase separation by immersion, the MF 2 -PS strategy can achieve more controlled porous structures with sponge-like open channels at submicron scale. The high surface polarity of the PI-separator also exhibited good wettability with liquid electrolytes, and a high electrolyte uptake (182 wt%) for achieving a high ion-conductivity. It also showed much superior thermal stability as compared to PP separator. Finally, due to the unique porous structures, the PI-separator by MF 2 -PS strategy successfully delivered a discharge capacity of 161.9 mA h g −1 for LiFePO 4 electrode, and very stable cycling performance. All these results indicates that the PI-separator by MF 2 -PS may find significant applications in safe and high-performance batteries.
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ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Yanqing Wang,Jianjiang He,Zengqi Zhang,Zhihong Liu,Changshui Huang,Yongcheng Jin
Graphdiyne (GDY), a new type of carbon material with an electron-rich conjugated structure, has been investigated as a separator coating layer to enhance the electrochemical performance of lithium–sulfur (Li–S) battery. Acetylenic bond (−C≡C–C≡C−) and benzene ring in the GDY coating layer are experimentally verified to reversibly attract the soluble lithium polysulfides by chemical adsorption during cycling. Meanwhile, the shuttle effect of soluble polysulfides is further physically restricted by the GDY coating layer due to the evenly distributed pores (5.42 Å) and a consistent interlayer spacing (3.65 Å) of GDY. Moreover, GDY is a conducting carbon skeleton with high Li+ mobility that can improve the rate performance. Hence, Li–S battery with an as-prepared GDY coating layer shows excellent electrochemical performances including superior specific capacity, excellent rate performance, and low capacity attenuation rate. The high initial discharge capacity of 1648.5 mA h g–1 at 0.1C and 819.5 mA h g–1 even at a high rate of 2C is achieved by this novel separator. The initial capacity of 1112.9 mA h g–1 at 0.5C is retained to 816.7 mA h g–1 after 200 cycles with a low attenuation rate of 0.13% per cycle. Compared with other coated separators, these results show that the GDY coating layer endows the separator with superior electrochemical performances for Li–S battery.
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高影响因子
ELECTROCHIMICA ACTA
·
2017
·
IF 4.798
Yanqing Wang,Zengqi Zhang,Masaki Haibara,Deye Sun,Xiaodi Ma,Yongcheng Jin,Hirokazu Munakata,Kiyoshi Kanamura
In this research, we demonstrate a new method for reducing the shuttle effect by confining polysulfide in separator area through the use of polyimide (PI) separator with reversible adsorption functions in lithium-sulfur batteries. As a comparison, the cells with polypropylene (PP) separators which have no function to adsorb dissoluble polysulfide show a result that the content of sulfur on lithium anode surface is increased up to 63.94% after 100th cycles with the content of N-methyl-N-butylpiperidinium bis-(trifluoromethylsulfonyl) imide (PP 14 TFSI) in the mixture electrolyte increasing. This result illustrates that the migration and reaction between dissolved polysulfide in PP 14 TFSI and lithium cannot be neglected although the solubility of polysulfide is slight in PP 14 TFSI solvent. However, when PI separators are introduced, besides improving the wettability with PP 14 TFSI-based electrolytes, experimental results also show that the PI separator has a reversible adsorption function to dissoluble polysulfide which is used to confining polysulfide in separator area to a certain extent due to the abundant nitrogen-, oxygen-containing functional groups in PI skeleton. What’s more, PI separator can decreases the sulfur content on lithium surface after cycling to 17.92% which decreases greatly than that with PP separator and improves its electrochemical performance.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Qian Wu,Xinping He,Chenyi Cui,Chenchen Jiao,Baojin Qi,Jinjia Wei
Mixed matrix membranes (MMMs) incorporating metal–organic frameworks (MOFs) hold significant promise for gas separation applications. However, the inherent disparity between the organic polymer matrix and the inorganic fillers frequently leads to interfacial incompatibility issues. In this study, we adopted an in-situ interfacial crosslinking strategy to fabricate MMMs incorporating NH 2 -Zn 2 (Bim) 4 nanosheets that simultaneously act as nanofillers and reactive crosslinkers. Specifically, during the thermal imidization reaction process, the amino groups of NH 2 -Zn 2 (Bim) 4 not only establish hydrogen bonding interactions with the carbonyl groups of polyamic acid (PAA) (the precursor of polyimide), but undergo dehydration reactions with carboxyl groups, leading to the formation of stable amide linkages. Meanwhile, the aromatic structure of the BI units, a key monomer of polyimide, closely resembles that of the ligands of NH 2 -Zn 2 (Bim) 4 , which can establish π-π stacking interactions, further improving the interfacial compatibility between the polymer matrix and MOF fillers. Among the prepared samples, MMMs incorporating 33.3 wt% NH 2 -Zn 2 (Bim) 4 nanosheets exhibit the maximum H 2 permeability of 680.5 Barrer, and its H 2 /N 2 and H 2 /CO 2 selectivities were 18.7 and 13.3, respectively, which were close to or even exceeded the Robeson upper bound. The proposed in-situ interfacial engineering based on chemical crosslinking provides a novel and effective route for fabricating high-performance MMMs with enhanced interfacial compatibility, demonstrating great potential for hydrogen separation applications.
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JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2020
·
IF 6.155
Baoquan Wan,Haiyu Li,Yunhui Xiao,Zhongbin Pan,Qiwei Zhang
Conventionally, interface effects between polymers and fillers are essential for determining the breakdown strength and energy storage density of polymer-based dielectric composites. In this study, we found that interface effects between different fillers have similar behavior. BN and BaTiO 3 fiber composite fillers with three different interface bonding strengths were successfully achieved by controlling composite processes (BT-fiber/BN < BT-fiber@BN < BT-fiber&BN), and introduced into a polyimide (PI) matrix to form composite films . Considerably enhanced breakdown strength and energy storage density were obtained in BT-fiber&BN/PI composites owing to strong interface bonding, compared to other two composite fillers, which are well supported by the data from the finite element simulation. Specifically, PI composites with only 3 wt% BT-fiber&BN possess an optimized energy storage density of approximately 4.25 J/cm 3 at 4343 kV/cm. These results provide an effective way for adjusting and improving the energy storage properties of polymer-based composites.
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COMPOSITES SCIENCE AND TECHNOLOGY
·
2017
·
IF 4.873
Shiheng Zhang,Xiaoya Li,Xiaoxiao Guan,Yancen Shi,Kun Wu,Liyan Liang,Jun Shi,Mangeng Lu
A pyridine-containing diamine, 4,4′-bis(5-amino-2-pyridinoxy)diphenyl ether, was prepared via a two-step procedure. Based on the diamine, a series of polyimides were prepared by traditional two-step method. The characteristic peaks of polyimides on their fourier transform infrared (FI-IR) spectra indicated full imidization. Thermogravimetric analysis (TGA), dynamical mechanical analysis (DMA), differential scanning calorimetry (DSC) and ultraviolet–visible (UV-vis) spectra data showed that the polyimides displayed good properties. Polyimide/hexagonal boron nitride (PI/hBN) composite films were prepared, 3,3′,4,4′-benzophenonetetracarboxylic dianhydride based polyimide (PI-2) was used as the matrix. In addition, the effects of hBN content on the thermal conductivity (TC) of PI/hBN composites films were investigated. The TC of pure PI-2 was 0.148 W m −1 K −1 , when the hBN content increased to 40 wt %, the TC increased to 0.686 W m −1 K −1 . The enhancement in this TC value was as high as 460% compared to pure PI-2 . Meanwhile, the PI/hBN composites films retained excellent thermal and dynamic mechanical properties .
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JOURNAL OF MATERIALS SCIENCE
·
2020
·Vol. 55
·期 33
·15919-15929
·
IF 3.553
Chen Yanping,Li Xiuting,Li Yaogang,Zhang Qinghong,Hou Chengyi,Wang Gang,Wang Hongzhi
The development of flexible dielectric polymers with robust temperature durability, excellent mechanical properties and high transparency will be of great significance for the soft electronics. In current work, a highly fluorinated polyimide (hF-PI) material was successfully synthesized. By using (3-Aminopropyl) triethoxysilane as “bridge” and controlling the humidity rigidly, transparent polyimide films with smooth surface and tight adhesion to a strong substrate was prepared. As well, the mechanism of non-transparent hF-PI film formation in an ambient atmosphere at a low concentration was clarified. Based on the high temperature resistance of the hF-PI, the indium–zinc oxide (IZO) semiconductor film was successfully prepared on hF-PI film by the simple eco-friendly aqueous route. The IZO thin-film transistor using hF-PI film as insulating layer exhibited highly transparent and excellent electrical performance in the carrier mobility and the on/off current ratio. In addition, the operating voltage was greatly reduced by physically doping with carbon nanotube, while the devices still maintained good transparency.
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高影响因子
HIGH PERFORMANCE POLYMERS
·
2020
·
IF 1.568
Ruiyi Li,Xiuwei Lv,Juan Yu,Xiaodong Wang,Pei Huang
In this study, silver–polydopamine–hexagonal boron nitride (h-BN@Ag) particles were prepared using mussel chemistry and reducibility of catechol. The modified method was simple and eco-friendly. In addition, we prepared h-BN@Ag/polyimide (PI) composite films via in situ polymerization, the scraper method, and thermal imidization. Owing to the good dispersion of the h-BN@Ag filler particles in the PI matrix and the bridging role of the Ag nanoparticles, the thermal conductivities of the h-BN@Ag/PI composite films were higher than that of the pure PI film. The thermal conductivity of the h-BN@Ag/PI film with the filler content of 10 wt% was 0.382 W (m·K)−1, which was 108% higher than that of pure PI films (0.184 W (m·K) −1). Furthermore, the composite films presented extremely low dielectric permittivity and loss tangent. Moreover, the heat resistance index of the composite films (304.6°C) was higher than that of pure PI (294.3°C). Thus, h-BN@Ag/PI composite films could be promising electronic packaging materials.
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高影响因子
Journal of Energy Storage
·
2025
·
IF 9.8
Yukun Shi,Chuying Zhang,Na Zhang,Jiajia Xue,Shuyang Zhou,Hao Teng,Jinbo Bai,Hang Zhao
Polymer-based electrostatic capacitors have a broad application prospect in modern electric power systems due to their advantages of high breakdown strength ( E b ) and power density. However, at high-temperatures, both the increase in dielectric loss and the deterioration of insulation properties triggered by the Joule heat result in a sharp decrease in the energy storage property of polymer-based capacitors, which greatly restricts the development of advanced electronics. To address this challenge, this study proposes a molecular engineering strategy that constructs an inorganic-organic cross-linked system with strong interfacial bonding via covalent linkages between amino-functionalized alumina (Al 2 O 3 –NH 2 ) nanorods and the polyimide (PI) matrix. This design enables synergistic regulation of charge transport through cross-linked networks and interfacial traps, effectively suppressing conductive losses in the composite at elevated temperatures. Notably, at 150 °C with a charge-discharge efficiency ( η ) of 92 %, the 1.5 wt% Al 2 O 3 -NH 2 /PI composite achieved a high energy storage density ( U e ) of 4.74 J/cm 3 , which was 204 % higher than that of pure PI ( U e ∼ 1.56 J/cm 3 ). Thus, this study provides a promising strategy for advancing high-temperature energy storage capacitors.
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