CHEMICAL ENGINEERING JOURNAL
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2026
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IF 12.5
Xinbin Ji,Lei Han,Yulong Xiang,Jing Guo,Fucheng Guan,Zheng Li,Yihang Zhang
Life-cycle PI porous fibers: in-service reinforcement and end-of-life upcycling. • In situ PAN-to-panof forms a rigid network that stabilizes porous PI skeletons. • CNT bridge cracks, boosting strength, hydrophobicity, and flame resistance. • KOH-activated PPC-K optimizes porosity, N/O sites, and charge transport for high C. • Symmetric supercapacitors deliver high capacitance retention over 10,000 cycles. High-temperature protective and lightweight insulating fibers are important for fire safety, extreme thermal protection, and advanced functional textiles. However, highly porous fibers generally suffer from pore-wall collapse, thermal shrinkage, insufficient mechanical support, and limited recycling routes after service. To address these issues, a full-life-cycle design strategy was proposed for polyimide (PI)-based porous fibers synergistically reinforced by polyacrylonitrile (PAN) and carbon nanotubes (CNTs). PI-based porous fibers were fabricated through wet spinning, phase separation, freeze-drying, and thermal imidization, and were further converted into PI-derived carbons by carbonization and KOH activation for supercapacitors. The ladder-like network formed from PAN after heat treatment (panof, a product of PAN pre-oxidation) and the CNT bridging structure jointly constructed a multiscale reinforced framework, endowing the PI/panof/CNT fibers with high tensile strength (22.8 MPa), strong hydrophobicity (water contact angle of 159.0°), and excellent flame retardancy (LOI = 55.2%). Moreover, the precursor structure showed a clear inheritance effect after carbonization/activation. The carbon derived from PI/panof fibers (PPC-K) achieved a favorable balance between pore structure and surface chemistry, with a specific surface area of 880.14 m 2 g −1 and a capacitance of 263.17 F g −1 at 0.5 A g −1 in a three-electrode system. Its symmetric coin-cell supercapacitor retained 91.67% capacitance after 10,000 cycles at 3 A g −1 . This work provides an integrated route from porous-fiber reinforcement to end-of-life conversion into energy-storage materials. Download: Download high-res image (551KB) Download: Download full-size image
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高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
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2026
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IF 8.2
Baoyue Zhang,Ruixue Wang,Fan Wan,Xiaoyun Liu,Hongyao Xu,Shanyi Guang
Developing lightweight and multifunctional electromagnetic absorption (EMA) materials remains important for advanced electromagnetic protection applications. Herein, we report a multifunctional composite aerogel constructed through a host–guest engineering strategy. The polyimide (PI) framework serves as the host matrix, while magnetic hollow Fe 3 O 4 @CoNi@PDA microspheres and conductive carbon nanotubes (CNT) act as functional guests. Molecular dynamics simulations indicate hydrogen-bond-assisted interactions between acidified CNT and PAA chains during precursor assembly. These interactions help support the formation of a stable porous framework. The optimized PCH-3 aerogel achieves a minimum reflection loss (RL min ) of − 33.1 dB at 2.8 mm and a wide effective absorption bandwidth (EAB) of 7.9 GHz at 3.6 mm. Beyond EMA performance, PCH-3 shows low density, thermal insulation capability, and mechanical resilience. Its density and thermal conductivity are 24.0 mg cm⁻ 3 and 0.043W m −1 K −1 , respectively. It also retains 97% of its stress after 50 compression cycles. Furthermore, radar cross-section (RCS) simulations indicate a maximum reduction of 30.2 dB 2 under the given simulated conditions. This study provides a feasible strategy for designing lightweight multifunctional aerogels for electromagnetic protection and thermal management.
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COMPOSITES SCIENCE AND TECHNOLOGY
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2025
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IF 9.8
Yaru Sun,Yanyan Zou,Yan Liu,Bo Cheng,Ying Hou,Fenglei Huang
Multifunctionality is a key direction for future protection, but effectively integrating multiple functions remains a significant challenge. Here, a self-cross-linked composite aerogel (PI/20Fe 3 O 4 @TS-Fe), core-shell Fe 3 O 4 (Fe 3 O 4 @TS-Fe) with amino groups can interact with acidic sites in polyimide (PI), is designed to achieve intelligent fire protection, radar stealth, and highly efficient heat-insulated performance. The PI/20Fe 3 O 4 @TS-Fe aerogel exhibits superior fire protection properties compared to neat PI aerogel. It achieves a 44.3 % lower peak heat release rate and a 57.8 % lower total heat release. Additionally, the enhanced thermoelectric properties of PI/Fe 3 O 4 @TS-Fe/GO enable accurate temperature sensing and stable fire-warning performance, with clear warnings lasting over 20 min. Furthermore, the synergistic effect of the structure and components endows the aerogel composite with dielectric loss capability for effective electromagnetic wave (EMW) absorption. The minimum reflection loss ( RL min ) is −25.6 dB, and the effective absorption bandwidth ( EAB ) is 2.5 GHz. The radar cross section ( RCS ) simulations also further confirmed that the self-cross-linked Fe 3 O 4 /PI composite aerogel possess potential for radar stealth in practical applications. This work provides a novel pathway to fabricate multifunctional aerogel via designing a self-cross-linked structure.
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Journal of Materials Chemistry A
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2026
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IF 9.5
Chuanjia Jiao,Jiayan Li,Caixia Wan,Jiawei Zou,Shifang Luan
The high-temperature and high-field energy storage performances of film capacitors are a key bottleneck restricting their applications in new energy, aerospace and other fields. Traditional dielectric biaxially oriented polypropylene (BOPP) has insufficient high-temperature resistance, while high-temperature resistant polymers such as polyimide (PI) exhibit excellent thermal stability but suffer from narrow bandgap and poor insulation performance. They cannot meet current demands under the common operating conditions of 200°C and 100~400 MV/m. Existing composite modification and intrinsic modification strategies have problems such as poor filler dispersion and high time cost, respectively. To address these issues, this study modifies Kapton through molecular design using commercial monomers as raw materials: high bandgap monomers are introduced to disrupt the conjugated structure, widen the material's bandgap, and thereby enhance high-temperature insulation; high polarity monomers are introduced to improve permittivity by virtue of their high dipole moment, strengthening polarization and energy storage capacity under unit electric field. Through the synergistic regulation of dual monomers, a PI material with both high bandgap and high polarity was successfully prepared. Under the high-temperature and high-field conditions of 200°C and 400 MV/m, it maintains a charge-discharge efficiency of over 90% and achieves a discharge energy density of 2.68 J/cm³, which is significantly superior to BOPP and traditional PI. This work provides a feasible polymer design path for the development of high-performance high-temperature energy storage dielectrics.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2026
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IF 9
Yi Xu,Gao Liu,Fukun Liu,Yurun Zhao,Qichao Ran
Accidental spills of hazardous and flammable liquids, such as aviation kerosene and industrial lubricants, pose severe environmental and safety risks, especially under extreme temperature conditions where conventional cleanup materials fail. Existing adsorbents are plagued by a performance trilemma, lacking the combined mechanical resilience, high adsorption capacity, and thermal stability required for effective remediation. Here, inspired by the human capillary system, we developed a biomimetic polyimide/polybenzoxazine (PI/PBOZ) aerogel with a layered “fiber-node-pore” structure. Among them, flexible PI nanofibers constitute the continuous scaffold (fibers, mimicking the compliant vascular walls), while rigid crosslinked PBOZ domains selectively localize at fiber junctions to function as “chemical rivets” (nodes, formed via strong intermolecular hydrogen bonding between phenolic hydroxyl groups on cured PBOZ and carbonyl groups on PI). The large interconnected voids between these riveted fibers form open macropores (pores, emulating the luminal channels for fluid transport). The optimized aerogel demonstrates an unprecedented combination of ultralow density (5.2 mg cm −3 ), super-resilience (98% recovery after 90% strain), and massive oil uptake (up to 276 g/g for high-viscosity oils). Crucially, it maintains functionality after direct flame exposure and in cryogenic environments (−140 °C), with a low thermal conductivity of 0.0248 W m −1 K −1 . The material's reusability is demonstrated through combustion-based regeneration, enabling complete oil removal without generating secondary liquid waste. This strategy establishes a robust and generalizable route to high-performance porous materials for mitigating hazardous oil spills and managing thermal risks in extreme industrial and aviation environments.
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POLYMER ENGINEERING AND SCIENCE
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2026
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IF 3.6
Bo Mu,Wei Li,Yunpeng Li,Wenyi Zhang,Bangrui Kou,Baoping Yang,Junhong Guo,Li Chen,Li Tian,Haijiao Xie
In this work, a 2,6-pyridine dicarboxylic hydrazide (PDDH) monomer was incorporated into polyimide (PI) to fabricate PDDH-Co-PI films featuring a dual physical cross-linked network based on metal–ligand coordination and intermolecular hydrogen bonding, as validated by X-ray photoelectron spectroscopy (XPS) and Fourier-transform infrared spectroscopy (FTIR). Formation of the coordination complexes and hydrogen bonds within the PI backbone altered the molecular chain conformation and aggregation state, leading to enhanced intermolecular interactions and tighter chain packing. X-ray diffraction (XRD) analysis confirmed a significant increase in the chain packing coefficient ( K ) and a reduction in interchain spacing ( d ). Consequently, PDDH-Co-PI exhibited markedly improved mechanical properties: tensile strength increased by 27.57% ± 0.82%, Young's modulus by 72.19% ± 3.90%, and fracture energy rose from 24.75 to 55.83 MJ·m −3 (an enhancement of 125.56% versus pure PI). The volumetric wear rate decreased from 26.92 × 10 −6 to 5.284 × 10 −6 mm 3 N −1 m −1 , representing an 80.4% reduction. These results demonstrate that the synergistic effect of coordination crosslinking and hydrogen bonding yields high-strength, high-toughness and wear-resistant PI films, providing a new strategy for the design and application of high-performance polyimide materials. Highlights PDDH monomer results in collectively H-bonding/coordination cross-linked PI. Dual cross-linking yields tough and strong PDDH-Co-PI films. PDDH-Co-PI film demonstrates excellent wear reduction performance.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2025
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IF 9
Chen-Jie Wei,Hao-Nan Yang,Yan-Nan Wu,Yuan-Xue Li,Jing-Feng Chen,Chen Peng,Li-Gang Lin,Li-Fen Liu
The isolation of spiramycin (SPM), a macrolide antibiotic with potent activity against gram-positive bacteria and intracellular pathogens, is critical for pharmaceutical applications and antimicrobial research. As emerging antibiotic resistance underscores the need for effective therapeutics, efficient extraction and purification of SPM from fermentation broths remain essential to ensure its availability for clinical use, industrial production, and structural derivatization. Compared with the traditional separation processes, membrane process has attracted extensive attention owing to its low cost, high separation efficiency, and energy savings in the traditional medicine industry. A novel soluble polyimide (PI) material with flexible branches and imide rings was synthesized based on molecular structure design. Using the homemade polymer material, a novel recyclable, acid-alkali resistant and solvent resistant PI nanofiltration (NF) membrane was fabricated for SPM extraction. The membrane exhibited optimal performance at 20 wt% solid content, and the effects of pressure, flow rate, concentration, and temperature on its separation performance were investigated. The rejection rate of SPM was >91 % and the permeance of butyl acetate reached 21 L/(m 2 . h), respectively. The permeances of rose Bengal in methanol, acetone, and isopropyl alcohol were 38, 48, and 10 L/(m 2 . h), with separation performances of 92.0 %, 92.3 %, and 92.4 %, respectively. Moreover, the enhanced stability with a permeance of 21 L/(m 2 . h) and rejection of >91 % for SPM was maintained after five days of long-term practical operation. The obtained PI NF membrane is prospective for improving traditional antibiotic extraction and advancing nanofiltration membrane in the pharmaceutical system.
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IONICS
·
2015
·Vol. 21
·期 7
·1937-1943
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IF 1.754
Rao Mumin,Li Xiaogang,Liao Youhao,Li Xiaoping,Li Weishan
A novel gel polymer electrolyte (GPE) based on an electrospun polymer membrane of polyimide (PI) activating with poly(vinylidene fluoride- co -hexafluoropropylene) (PVDF-HFP) and further coating with nano-Al 2 O 3 was prepared, and its performance for lithium-sulfur (Li-S) cell was investigated. It is found that the Li-S cell using the new GPE enabled achieving a stable discharge capacity of 820 mAh g −1 after more than 100 cycles. This new GPE system with activating with PVDF-HFP and further coating with nano-Al 2 O 3 was capable of upholding the electrolyte solution and can suppress the dissolution of the intermediate products generated during the discharge process and thus improves the performance of Li-S cell.
研究领域:
材料科学
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储能技术
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高分子化学
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电化学
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高影响因子
EUROPEAN POLYMER JOURNAL
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2023
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IF 6
Yina Zhuge,Fujuan Liu
In order to obtain fiber membrane materials with excellent thermal insulation properties, we successfully prepared lightweight PI/PSA porous micro-nano fiber membranes by microemulsion electrospinning technology combined with calcination in this work. The morphology, tensile strength and thermal insulation properties of the fiber membranes were fully characterized. The PI/PSA micro-nano fiber membranes prepared at the PI concentration of 17 wt%, the dispersed phase/continuous phase mass ratio of 1/10, the PI/PSA mass ratio of 7/3, and the voltage of 16 kV exhibited the best morphology and the most uniform fiber diameter. Besides, the PI/PSA porous micro-nano fiber membrane obtained after calcination had excellent tensile properties (breaking stress: 10.54 ± 1.96 MPa) and thermal insulation performance (thermal conductivity: 44.7 mW·m −1 ·K −1 ). The thermal imaging and thermocouple results showed that the thermal insulation performance of PI/PSA porous micro-nano fiber membrane was superior to that of PI/PSA membrane, and the thermal insulation properties became more excellent as the number of membrane layers increased. The PI/PSA porous micro-nano fiber membrane with low thermal conductivity acquired in this work is expected to broaden the application of protective clothing.
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高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2022
·Vol. 128
·期 10
·1-11
·
IF 2.983
Xi Yuchun,Yin Chuanqiang,Xu Lexiang,Xiong Wei,Xu Hang,Luo Jinpeng,Huang Shirong,Ma Lei,Zhou Lang,Li Xiaomin
The excellent thermal conductivity of graphite films makes it an ideal thermal management material in the field of electronics. Flexibility is an important property for preparing polyimide (PI)-derived graphite films with high thermal conductivity. In the study, hexagonal boron nitride (h-BN) was used as a foaming agent to improve the flexibility of PI-derived graphite films. A series of graphite films were prepared via carbonization and graphitization of self-synthesized polyimide films using h-BN as the foaming agent. The influence of different amounts of h-BN on the structure, flexibility, and thermal conductivity of graphite films was studied in detail. Compared with pure PI-derived graphite film, the flexibilities of h-BN/PI-derived graphite films improved significantly. The flexibility improvement mechanism of graphite film using h-BN as foaming agent was also proposed. The vaporization of BN powders at ultra-high temperature results in the pressure difference between inside and outside of the graphite layers, and then the graphitic “bubbles” were formed on the graphite film. The semicircular “bubbles” created by h-BN sublimation could provide enough adjustment space for the shear slip, and some of the forces around the pores could be partially offset. According to the results, the graphite film derived from the 0.06 wt% h-BN/PI composite film owe the best comprehensive performance, including excellent flexibility, relatively high thermal diffusivity and high in-plane thermal conductivity. This research has important application value in the field of heat dissipation of electronic devices. Graphical abstract
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COMPOSITES PART B-ENGINEERING
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2022
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IF 11.322
Feng Yang,Junru Yao,Liqiang Jin,Wenjun Huyan,Jintang Zhou,Zhengjun Yao,Peijiang Liu,Xuewei Tao
Nowadays, multifunctional electromagnetic (EM) wave absorbing aerogels have attracted much attention due to intelligent and wearable features for electronic devices. However, the utilization of these aerogels at elevated temperature is still challenge. Herein, we describe a robust strategy to fabricate architecturally controllable and multifunctional Ti 3 C 2 T X MXene/aramid nanofiber (ANF)/polyimide (PI) aerogels with desirable EM wave absorption, adjustable mechanical property, and high thermal insulation . Rational structural design endows the aerogels with an effective absorption bandwidth (EAB) of 4.2 GHz (covering whole X-band) at 250 °C. Exploration of the temperature response over 25–250 °C reveals that the microstructure characters of the aerogels contribute substantially to the EM parameters at elevated temperature, while the in-depth temperature-dependent mechanisms of aerogel EM performance are well studied. Further, through regulating the microstructure, the MXene/ANF/PI aerogels also exhibit tunable mechanical performance (maximum compressive stress of 334.3 KPa at 40% compression) and promising thermal insulation performance (0.029 ± 0.003 W mK −1 , closing to air). These multifunctional aerogels light the way to potential application in the EM wave absorption field of flexible devices at elevated temperature.
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POLYMER
·
2022
·
IF 4.432
Jinshan Liu,Jinhui Li,Tao Wang,Dongxu Huang,Zhipeng Li,Ao Zhong,Wen Liu,Yuying Sui,Qiang Liu,Fangfang Niu,Guoping Zhang,Rong Sun
Thermoplastic polyimide (TPI) has been extensively applied in electronic industry due to improved processibility, superior mechanical and dielectric properties. However, TPI is still restricted by the limited thermal stability and insufficient UV absorption for the application of temporary bonding and debonding (TBDB) in ultra-thin chip package. In this work, the rigid biphenyl group, twisted non-coplanar structure, rigid bulky side group and flexible ether bond are introduced to obtain a series of novel quaternary copolymerized TPIs with superior comprehensive performance. The results show that the as-prepared TPI possesses excellent solubility in NMP , DMF, DMAc and DMSO , and thermoplasticity ( E ’ drop > 10 3 MPa). Besides, the temperature of 5% weight loss and glass transition temperature could achieve as high as 548.1 °C and 335.4 °C, respectively. Furthermore, the tensile strength of TPI-4 is 128.7 MPa and elongation at break is about 14.2%. Moreover, the TPI-4 also exhibits superior adhesion on silicon wafer (adhesion strength >5 B by hundred grid test) and wonderful absorption at 355 nm UV laser (99.7%). At last, the application in TBDB process has also been proved with a laser energy of 400 mJ/cm 2 within 60 s, showing superior efficiency and low-cost. All these results prove their application in TBDB of ultra-thin chip package for 5G era and so forth.
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危险品化学品经营许可证（带存储）