ADVANCED FUNCTIONAL MATERIALS
·
2022
·Vol. 32
·期 31
·2201496
·
IF 19.924
Yue Huang,Shujie Liu,Qiaojing Chen,Kejin Jiao,Bin Ding,Jianhua Yan
Solid electrolytes are being considered as an effective solution to replace liquid ones for building safer batteries, but they suffer either low ionic conductivity or large contact ohmic impedance. Here, a highly conductive and thermomechanically stable quasi-solid electrolytes (QSE) by self-polymerization of a commercially available liquid electrolytes (1,3-dioxolane (DOL), 1,2-dimethoxyethane (DME), lithium trifluoromethane sulfonimide (LiTFSI) and LiPF 6 ) at room temperature in a porous polyimide nanofiber film are reported. LiPF 6 initiates the ring-opening reaction of DOL and LiTFSI promotes the self-polymerization to form poly-DOL (PDOL), while the plasticizer of DME solidifies the PDOL. On the other hand, polyimide has a great affinity with PDOL that facilitates to form stable QSE network. As a result, the QSE film shows a high room-temperature ionic conductivity of 2.9 × 10 −3 S cm −1 , a high mechanical strength of 31 MPa, and high heat resistance to 160 °C. The LiFePO 4 ||QSE||Li batteries with a high cathode loading of ≈18.7 mg cm −2 show great cycling performance and stable electrode/electrolyte interfaces at a high current rate of 0.5 C with a capacity retention of 91.8% over 200 cycles at room temperature.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Ao Tang,Zhuo Chen,Huijie Nie,Jie Dong,Xin Zhao,Xiuting Li,Qingsong Xu,Qinghua Zhang
A series of highly selective polyimide gas separation membranes were successfully synthesized by reacting the newly synthesized dianhydride monomers containing the amide unit and benzyl group with a commercial diamine, 1,3,5-trimethyl-2,4-phenylenediamine (DAM). The combination of the intermolecular hydrogen-bonding interaction from the amide-imide backbone and the thermo-oxidative cross-linking network induced by the benzyl units endows the membrane with a strong size-sieving capability with an ideal CO 2 /CH 4 selectivity > 125 (over six times higher than that of the commercial Matrimid 5218) with a moderate CO 2 permeability, ranking the top among that of the polyimide gas separation membranes reported so far. The comprehensive separation performance for the CO 2 /CH 4 gas pair surpasses the state-of-the-art 2008 upper bound. Moreover, the prepared membrane showed an increased stability toward high CO 2 pressure of 12 bar, demonstrating an excellent plasticization resistance due to the tightened molecular packing and confined molecular chain motion as well as the rigid nature of the polymer backbone, which also enabled high glass transition temperatures (>400 °C) and fine mechanical properties (tensile strength > 52 MPa) as well as an anti-aging property of the prepared membranes. This study provides a reliable route for constructing polymer membranes with an accurate gas molecular sieving ability and high durability.
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Energy Storage Materials
·
2024
·
IF 18.9
Shuai Cui,Ting Li,Donggang Tao,Daohong Zhang,Yuliang Cao,Fei Xu
Rechargeable magnesium batteries are a potential selection for large-scale energy storage technologies, but development of cathode materials is the major difficulty at present. Organic polyimides are promising magnesium battery cathodes with the open and amorphous frameworks as well as enhanced charge delocalization. However, only two carbonyls are redox-active out of four for each imide unit, which largely limits the capacity. Herein, a new polyimide containing disulfide bond is fabricated and studied as cathode for rechargeable magnesium batteries. This polyimide shows a high capacity beyond the traditional two-electron principle. A mechanism study demonstrates that carbonyl enolization and disulfide bond break/formation occur in the redox process, leading to formation/break of sulfur-oxygen bond. This sulfur-oxygen bond enhances enolization and electron delocalization, resulting in an improved capacity. Further theoretical computation indicates a charge transfer within this sulfur-oxygen bond. The two-electron reduction state exhibits quite low HOMO and LUMO energy levels, which makes the disulfide bonded polyimide have a higher tendency to accept more electrons and a higher oxidation stability after reduction.
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POLYMER COMPOSITES
·
2025
·
IF 4.7
Hao Wang,Naihang Kuang,Xu Guo,Zhen Hu,Chunhua Zhang
The multi-molecular grafting interface becomes significant for the perfect structure construction of carbon fiber reinforced composite (CFRC), being built in this study between the epoxy-sized carbon fibers (CFs) and polyimide (PI) matrix via the multi-molecular coupling reactions among the epoxy sizing layer, hydroxyl-rich silicide nanomaterial (SiO 2 OH), and disulfide catalyst. They not only endowed the composite with multiple coupling interactions at the PI/CF interface but also promoted the surface-initiated radical curing reactions on both the sizing layer and the surface of SiO 2 OH. As a result, the SiO 2 OH nanofiller within the PI/CF composite constituted the composite interface with a nacre-like structure, exhibiting superior interfacial shear stability and excellent mechanical properties. The interfacial shear strength (IFSS) of the PI/CF composite reached 1.93 times the original thermally cured ones (value of 144.23 MPa), keeping higher flexural strength and modulus of 2000.1 MPa and 191.0 GPa. The nanofilling effect of SiO 2 OH components endowed the CFRC with structural integrity and mechanical failure mechanism based on the whole fracture of the composite rather than the delamination failure among the CF/matrix multilayers.
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Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
Xinyu Yao,Xianbo Hou,Guocheng Qi,Rubing Zhang
Super-wetting fibrous membranes have been widely researched for the separation of oil-water mixtures and light oil-water emulsions. However, reusable oil-water separation membranes for heavy oil with high viscosity and high density have proved to be extremely challenging. Herein, superhydrophobic, flexible, and foldable polyimide (PI) nanofiber membranes for heavy oil separation were prepared by using electrospinning method combined with surface modification to build a stable nano-scale roughness on the fiber surface. The results demonstrated that the fibrous membranes modified by fumed silica and 1H, 1H, 2H, 2H-perfluorooctyl trichlorosilane(PFTS) not only had excellent mechanical robustness, but also achieved both ultra-high oil-water selectivity and separation performance. The as-prepared PI fibrous membranes showed the ultra-high gravity-driven light/oil-water emulsion separation flux of 3904.7 L m −2 h −1 and 22474.7 L m −2 h −1 with and without emulsifier stabilization, and the flux of heavy oil can reached 271.36 L m −2 h −1 under 25KPa. The mechanically robust and reusable PI fibrous membranes with high efficient oil-water emulsion and heavy oil separation performance exhibit great potential for practical applications for oily wastewater and oil spill treatment.
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JOURNAL OF MEMBRANE SCIENCE
·
2024
·
IF 8.4
Xi Chen,Zhenggang Wang,Zhuo Yang,Guozhen Liu,Guining Chen,Gongping Liu,Xiuxia Meng,Naitao Yang,Wanqin Jin
Towards natural gas purification , polymeric membranes generally face challenges of trade-off between permeability and selectivity , as well as CO 2 -induced plasticization effect. Previous works demonstrated that incorporating high-performing nanofillers and crosslinking the polymers are effective methods to overcome these two issues, respectively. In this work, we aimed to simultaneously improve permeability, selectivity and plasticization resistance of polymeric membranes by incorporating surface-engineered nanoporous fillers for CO 2 /CH 4 separation. DD3R zeolite nanoparticles with high purity were synthesized and then surface-functionalized by 3-aminopropyl trimethoxysilane (APTMS) to serve as the filler. Mixed-gas permeation measurements showed that DD3R zeolites offered CO 2 -selective channels in 6FDA-DAM polyimide based on molecular sieving effect of zeolitic aperture. 30 wt% DD3R-APTMS zeolite imparted the membrane with CO 2 permeability of 1661 Barrer (increased by 71.7%) and CO 2 /CH 4 selectivity of 28.0 (increased by 44.5%), which was beyond the upper-bound of polymeric membranes. Meanwhile, the hydrogen bond interaction between amino groups on APTMS and carboxyl groups on 6FDA-DAM rendered the resulting DD3R-APTMS MMMs highly enhanced plasticization resistance over 40 bar when equimolar CO 2 /CH 4 mixture as the feed. This work demonstrates a facile approach to simultaneously enhance separation performance and mitigate the plasticization effect.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·
IF 7.2
Peng Wei,Dong Huang,Yang Sui,Xi Li,Qingkun Liu,Bensheng Zhu,Chuanbo Cong,Pengpeng Bai,Yu Tian,Qiong Zhou,Xiaoyu Meng
Solid heteropolyacids with high intrinsic proton conductivity , like phosphotungstic acid (HPW), were added to further enhance the proton conductivity of sulfonated poly ether ketone (SPEEK). The great solubility of solid acid within water, however, would produce a dramatic decline in stability and durability. In this study, we utilized polydopamine (PDA) coated polyimide (PI) nanofiber to form the acid-base pair between PDA@PI nanofiber and HPW/SPEEK to anchor the HPW. Additionally, a pocket was constructed in the sandwich-structure PDA@PI/SPEEK + HPW membrane to help better anchor the HPW. After 6 weeks of durability treatment during 60 °C and 100% RH, proton conductivity of PDA@PI/SPEEK + HPW-20 was 163.5 mS cm −1 , which was only 23.0% lower than that of the initial state . By sharp contrast, it was 55.2% lower than the initial state for pristine SPEEK. And its swelling ratio is only 54% compared with 128% of pristine SPEEK under the same condition. We first revealed and investigated the acid-base pair created by PDA@PI and HPW/SPEEK, which was beneficial for proton conductivity and durability. This pocket-like PDA@PI/SPEEK + HPW membrane would inspire a wide application in PEM among excellent proton conductivity, better stability, with endurance.
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ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Yajun Zhang,Long Pan,Xin Cao,Peigen Zhang,ZhengMing Sun
Gradient structures are effective for microwave absorbing but suffer from inadequate lightweight and poor flexibility, making them fall behind the comprehensive requirements of electromagnetic protection. Herein, we propose a hierarchical gradient structure by integration with porous and sandwich structures. Specifically, polyimide (PI) foams are used as a robust and flexible skeleton, in which the foam cell walls are sandwiched by Ti3C2Tx, ZnO, and ZrO2 atomic layers in sequence. Owing to the decreasing conductivity of Ti3C2Tx, ZnO, and ZrO2, they form gradient impedance matching layers on both sides of the PI foam cell walls, significantly enhancing the absorbing intensity for microwaves. In addition, the porous and sandwich structures can synergistically facilitate multiple reflections, increasing the number of interactions between microwave and foam cell walls. Therefore, the resulting lightweight ZrO2@ZnO@Ti3C2Tx@PI (ZrZnTP) composite foams reach a minimum reflection loss of −68.4 dB with an effective absorbing bandwidth covering the whole X band (8.2–12.4 GHz). The ZrZnTP also exhibits outstanding flexibility even at an extremely low temperature of −196 °C (i.e., liquid nitrogen). This work offers a general approach to realizing hierarchically integrated structures of gradient, porousness, and sandwich structures for lightweight, flexible, broadband, and strong microwave absorbing materials.
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PubMed
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Tianze Wang,Hui Chi,Danying Zhao,Qitong Wang,Zhenhua Jiang,Yunhe Zhang
In recent years, boron nitride nanosheets (BNNS) have been widely used in the development of polymer-based thermal interface materials (TIM) due to their excellent thermal conductivity and electrical insulation. However, the thermal performance of these TIMs is still unsatisfactory, mainly because BNNS do not connect effectively in the polymer matrix. The lamellar structure of a crepe cake in life provides inspiration for the design of this study. In this study, TIM with long-range ordered structure was prepared by using the freezing process guided by double temperature gradient. The long-range ordered structure forces BNNS to be tightly connected and highly oriented between polymer layers, thus providing long-range conduction paths for phonons. The composite prepared by this strategy exhibits excellent in-plane thermal conductivity (10.4 W/(m·K)), volume resistivity, tensile strength and thermal stability at only 20 vol% BNNS loading, which makes it has a broad application prospect in the field of electronic device packaging. In addition, the strategy provided by the study can not only be applied to the development of thermal conductivity composites, but also can be extended to different material combinations of various functional composites.
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MOLECULES
·
2025
·Vol. 30
·期 8
·1709
·
IF 4.6
Junyong Chen,Defang Pan
The inherent brittleness of silica aerogels has hindered their application in thermal protection systems. To overcome this limitation, we developed a silica/polyimide composite aerogel with a bio-inspired “pomegranate-like” structure through in situ gelation. The strategic integration of polyimide nanofibers into the silica matrix created an interlocking network that immobilized silica particles, effectively resolving the mechanical fragility. By modulating the polyimide precursor (polyamic acid) concentration to 0.08 g/cm3through polyimide nanofiber reinforcement, the compressive strength reached 2.86 MPa—12 times greater than that of unmodified silica aerogel. The material demonstrated multifunctional performance: exceptional flame resistance (withstanding 1300 °C flame for 20 min with self-extinguishing behavior), high hydrophobicity (123° water contact angle), and ultralow thermal conductivity (0.035 W/(m·K)). This synergistic combination of tunable mechanics, thermal stability, and insulation properties positions the composite as an advanced solution for next-generation thermal protection materials.
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PubMed
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PROGRESS IN ORGANIC COATINGS
·
2026
·
IF 7.3
Yunfeng Yang,Weibing Xu,Zhengfa Zhou,Haihong Ma,Fengmei Ren
Polyimide (PI) exhibits high-temperature resistance and corrosion resistance, making it a high-potential coating substrate. However, for use in automotive motor bearings, its adhesion and wear resistance still require improvement. This study investigated the efficient exfoliation of MoS 2 and combined few-layer MoS 2 with Polytetrafluoroethylene (PTFE) as a synergistic wear-resistant agent, which can be incorporated into PI coatings to improve the wear resistance. It achieved a minimum coefficient of friction (COF) of 0.073 and a wear rate of 0.0554 × 10 −5 mm 3 /(N·m). This result is attributed to the layered structure of few-layer MoS 2 and its synergistic interaction with PTFE. The structure of PI contains numerous ether bonds and highly polar sulfone groups that can bind to metal surfaces. The resulting coating achieves level 0 adhesion (ISO 2409:2020) on metal substrates for bearings, while exhibiting high toughness, impact resistance, and coolant resistance. This work is of great significance to research on high-adhesion coatings and nanoscale synergistic lubrication.
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APPLIED THERMAL ENGINEERING
·
2026
·
IF 7.5
Yuhang Wang,Xiaoke Wei,Canying Zhang,Daxiong Wu,Haitao Zhu
Fluorinated PI film integrates with BaHPO 4 /SiO 2 particles to form a Janus structure. • The film achieves 96.94% solar reflectivity and 94.70% MIR emissivity (6-16 μm). • Outdoor test shows 13 and 22 °C lower than commercial coatings and standard paints. • The film is flexible, durable, self-cleaning, and flame-retardant. Radiative cooling offers a promising passive strategy for thermal management of electronic devices; however, achieving the combination of high solar reflectivity, broadband mid-infrared (MIR) emissivity, and robust mechanical performance remains challenging. In this work, a fluorinated polyimide (PI)-based composite film with enhanced radiative cooling capability is developed via electrospinning followed by vacuum-assisted filtration. By incorporating BaHPO₄ and SiO₂ particles into a fibrous PI matrix, a gradient-structured composite is formed, enabling synergistic spectral regulation. The best-performing film exhibits a high average solar reflectivity of 96.94% (0.25-2.5 μm) and a strong broadband MIR emissivity of 94.70% (6-16 μm), matching the thermal radiation characteristics of typical electronic devices. The fabrication strategy also improves interfacial bonding, resulting in a tensile strength of 17.15 MPa. Experimental evaluations using a simulated electronic device demonstrate significant cooling performance, with temperature reductions of 13 °C and 22 °C compared to commercial high-reflectivity coatings and conventional paints, respectively. Additional tests confirm excellent flexibility, wear resistance, flame retardancy, hydrophobicity, and weather stability. This study provides a scalable approach to engineering high-performance radiative cooling films for energy-efficient thermal management of electronic systems operating under both indoor and outdoor conditions.
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