Journal of Materials Chemistry C
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2024
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IF 5.7
Liangkang Huang,Jianwei Li,Shuting Chen,Bilin Zhang,Shengping Li,Wei Fan,Qiangli Zhao,Xuman Wang
Developing a piezoelectric polymer with high-temperature resistance is crucial for fabricating flexible piezoelectric sensors that can be used under extreme conditions. Herein, we for the first time found the piezoelectric properties of polyimide (PI) nanofibers and further enhanced their output voltage characteristics by introducing a fluorine-containing hexafluorodianhydride (6FDA) unit into the PI nanofibrous matrix. The as-fabricated sensor can produce a stable piezoelectric output of 10 V with a 478.72 mV N−1 sensitivity. The response and recovery times are 15 ms, respectively, and the output can remain stable after 10,000 cycles at 15 Hz/10 N, demonstrating excellent durability. Meanwhile, the 10–30 V piezoelectric output signals generated by different actions can be accurately identified for wearable applications. Furthermore, it is found that fluorinated polyimide (FPI) prepared by electrospinning can maintain structural stability before 500 °C, and its thermal decomposition temperature is above 550 °C. Moreover, the surface morphology with high porosity and the low surface energy of F atoms endow the nanofiber film with excellent superhydrophobic properties with a water contact angle of 139.6°. This work presents PI nanofibers with high-temperature resistance and outstanding piezoelectric properties, laying a potential foundation for their application in wearable and flexible electronic devices that can be used in extreme environments.
研究领域:
材料科学
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传感器技术
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高分子化学
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IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION
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2025
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IF 3.1
Wenchao Zhang,Yu Teng,Yong Zhang,Dong Yue,Xiaoxing Cheng,Yunpeng Liu,Yu Feng
Polymer materials play an important role in power electronics and electrical insulation systems. Despite significant efforts in research to enhance their insulation performance, improving the dielectric and insulation properties of polymer dielectrics remains a challenging task. In this work, a method was introduced to enhance the breakdown strength and corona endurance life of polyimide films by adding hydroxylated boron nitride/polyethyleneimine nanosheets. The breakdown strength of polyimide based composite film is significantly enhanced (661 kV/mm), and the corona endurance life reaches 40 h. The improvement in breakdown strength is mainly attributed to the wide bandgap characteristics of BNNS. And the hydroxylated boron nitride nanosheets have excellent dispersibility in the composite film. The improvement of corona endurance life is due to the formation of a reverse built-in electric field inside the filler of BOP under low voltage conditions, which is opposite to the direction of the external electric field. The built-in electric field can partially counteract the external electric field, reducing the number of ionized electrons generated during the secondary collision process, thereby extending the corona endurance life. In addition, the two-dimensional nanosheets form a barrier layer, hindering the electrical breakdown path and further improving the insulation performance. The research results provide a new design approach for improving the insulation performance of polymer composite films.
研究领域:
高分子材料科学
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电气工程
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介电物理
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纳米复合材料
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绝缘技术
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JOURNAL OF ALLOYS AND COMPOUNDS
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2025
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IF 6.3
Lujie Dong,Ping Zhang,Wei Hu,Xingyou Tian,Xian Zhang,Jian Zhang,Hui Zhang
Current solar energy conversion materials based on the photo-thermo-electric effect faced challenges such as intermittent energy conversion, as well as a certain waste of resources and equipment due to unable to work at night. In order to address these issues, we have developed a film for power generation based on the photothermal and thermoelectric effects. In the composite film, the superconducting carbon black connected Bi 2 Te 2.7 Se 0.3 established an effective conductive pathway in the polyimide (PI), resulting in a Seebeck coefficient (S) of −95 μVK −1 , and a thermoelectric figure of merit (ZT) of 0.18 × 10 −3 for the composite film. Based on the photothermal and thermoelectric effects, the voltage output of the composite film during the day can be simulated and regulated by adjusting the power parameters of the laser emitter and the position of the laser. The composite film generated an output voltage of 5 mV owing to the exceptional thermoelectric effect. At night, Peltier effect and Joule heating effect permitted the attainment of a maximum temperature of 93 °C and a maximum temperature differential of 10 °C when the load voltage was 2 V. A homemade four-legged thermoelectric system achieved an output voltage of 227 mV and an output power of 2.659 mW at a laser power of 1.5 W/cm 2 . Concurrently, the composite film exhibited optimal mechanical characteristics, and bending cycle stability. As a result, this study provided a novel idea for the multifunctional integration, which not only provided efficient output during the day but also temperature control at night.
研究领域:
材料科学
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能量转换
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热电材料
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光热转换
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柔性电子学
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CHEMICAL ENGINEERING JOURNAL
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2022
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IF 16.744
Liuting Li,Jiufeng Dong,Renchao Hu,Xianqiang Chen,Yujuan Niu,Hong Wang
In advanced electronics and electrical power systems, polymer dielectric capacitors are favored for their high power density and great reliability. However, the low energy density at high temperatures constrains their use in emerging applications. To address this vital issue, herein, a novel calcium fluoride (CaF 2 ) nanoparticle with a wide bandgap (∼12.1 eV) and moderate permittivity (∼10.0) is prepared by a simple direct precipitation method and then introduced into the polyimide (PI) matrix. The incorporation of the CaF 2 nanoparticles increases the permittivity and reduces conduction loss simultaneously. Consequently, at 150 ℃, the PI film with 3 vol% CaF 2 exhibits enhanced discharged energy density and breakdown field of 2.68 J cm −3 and 455.4 MV m −1 , respectively. Besides, the composite shows a higher power density of 0.36 MW cm −3 and a faster discharge speed of 2.09 μs at 150 ℃ than that 2.93 μs of biaxially oriented polypropylene (BOPP) measured at 85 ℃. Notably, CaF 2 nanofiller, as a deep trap, captures injected charges and alleviates the local electric distortion, as revealed by finite element simulation and thermally stimulated discharge current (TSDC) measurement. This work proposes a novel fluoride nanofiller to rationalize the energy storage improvement of high-temperature composites with potential wide application.
研究领域:
材料科学
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电气工程
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JOURNAL OF SEPARATION SCIENCE
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2019
·Vol. 42
·期 11
·2023-2031
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IF 2.516
Kai Hu,Jiamin Cheng,Binbin Lu,Wenjie Zhao,Chunhong Dong,Huaixia Yang,Yanjie Huang,Shusheng Zhang
A core-shell structured magnetic polyimide composite has been synthesized by the covalent coating of a mesoporous polyimide polymer onto the surface of magnetite nanoparticles. The nanocomposite was characterized by scanning electron microscopy, transmission electron microscopy, N 2 adsorption-desorption isotherms, X-ray diffraction, infrared spectroscopy, and vibrating sample magnetometry. The results showed that the prepared composite had a large surface area (306.45 m²/g), a unique pore size (2.15 nm), and strong magnetic properties (45.7 emμ/g), rendering it a promising sorbent material for magnetic solid-phase extraction. The parameters that affect the extraction efficiency of rhodamine B were optimized with the assistance of response surface methodology. Under the optimal conditions, the developed method has been successfully applied to determine the rhodamine B in food samples. The linearities and limits of detection of rhodamine B in hot pepper, red wine, and chili powder samples were measured. Satisfactory recoveries in the range of 94.8–103.3% with relative standard deviations <5.5% were obtained. Investigation of the adsorption mechanism of magnetic polyimide composite indicated that multiple interactions, including hydrophobic, π-π, and hydrogen bonding interactions, were involved in the adsorption process.
研究领域:
材料科学
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分析化学
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CHINESE JOURNAL OF POLYMER SCIENCE
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2024
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IF 4.1
Wang He,Liu Zhen-Chao,Shang Xue,Feng Li-Dong,Bian Xin-Chao,Chen Xue-Si
A series of transparent crosslinked colorless polyimide (CPI) films are prepared from 3,3′,4,4′-biphenyltetracarboxylic dianhydride (BPDA), 2,2′-bis(trifluoro-methyl)benzidine (TFMB), and 4,4′-oxydianiline (ODA) by thermal imidization, incorporating varying contents of 2,2′-(1,3-phenylene)bis(2-oxazoline) (1,3-PBO) as the crosslinking agent. Following the incorporation of the crosslinking structure, the CPI films show good optical transparency (approximately 85% winthin visible light range), enhanced glass transition temperature (from 325 °C to 341 °C), and improved thermal stability, and tensile strength. Notably, compared with the pristine uncrosslinked CPI, these crosslinked CPI films significantly increase in elongation at break (from 5.4% to 44.2%). Furthermore, the new approach ensures that crosslinked CPIs improve heat resistance and mechanical properties, while avoiding the embrittlement of materials. This study also offeres straightforward preparation methods for optically transparent crosslinked polyimides without additional processing steps. All these results make this approach can effectively improve the competitive performance of the CPI films for potential applications in microelectronic and optoelectronic fields.
研究领域:
材料科学
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高分子化学
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DOI
高影响因子
COMPOSITES SCIENCE AND TECHNOLOGY
·
2026
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IF 9.8
Jing Ye,Ao Xu,Zhijia Wang,Hang Luo,Xiwen Yang,Sheng Chen
All-aromatic polyimide dielectric films will seriously lose their energy storage performance at high temperatures because of high conductive loss caused by the conjugation effect of benzene rings in the backbone and charge transfer effect, especially commercial Kapton film. In order to maintain the low leakage current and energy storage stability of polyimide under high temperature and electric field, a synergistic strategy is employed to synthesize Kapton-based cross-linked dielectric films, involving polyhedral oligomeric silsesquioxane (POSS) cross-linked structure and a partial aliphatic structure. The results show that the energy storage performance of cross-linked ternary polyimides is significantly enhanced at room temperature and high temperature due to the construction of a “peak-shaped barrier” that effectively suppresses charge injection and transport. The discharge energy densities at room temperature and 150 °C are 8.01 J/cm 3 and 5.04 J/cm 3 , respectively, which are much higher than those of pure Kapton. This study provides a valuable strategy and insights for the development of polyimide dielectrics with high capacitive properties over a wide temperature range.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2026
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IF 5.4
Lei Xu,Zhiqi Li,Ying Li,Yijia Xu,Hongcheng Li,Song He
In this study, glass fiber/polyimide composite aerogel (GF/CLPI) was successfully fabricated via directional freezing technology. By precisely controlling the mass ratio of polyamic acid salt to glass fiber (GF) powder (ranging from 5:1 to 1:2), and through high-speed blending, liquid nitrogen-induced directional crystallization, freeze-drying, and stepwise thermal imidization processes, anisotropic structured materials were obtained. Microscopic characterization revealed that the axial cross-section exhibited a honeycomb-like interconnected pore structure. At the same time, the radial direction formed a layered orientation. GF were uniformly embedded in the polyimide pore walls, resulting in a homogeneously distributed reinforcing phase. Performance tests demonstrated that the material had an initial decomposition temperature of 490 °C in air and 550 °C in nitrogen. Furthermore, the radial thermal insulation performance (thermal conductivity ranging from 27.4 to 36.6 mW·m −1 ·K −1 ) was significantly superior to that in the axial direction (thermal conductivity ranging from 27.5 to mW·m −1 ·K −1 ). At elevated temperatures, the polyimide matrix and GF cooperatively formed an insulating carbonized layer, thereby endowing the material with self-extinguishing properties. This structure-property coordinated regulation strategy offers a novel approach for the development of advanced lightweight thermal insulation materials.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2026
·
IF 6.7
Le Chen,Lingling Tang,Haokun Geng,Qinghong Kong,Huimin Sun,Mingyi Chen,Wang Zhan
A lightweight, multifunctional polyamide acid (PAA)/carbonyl iron powder (CIP) composite aerogel with integrated thermal insulation and microwave absorption capabilities is developed via multi-structure design. With polydopamine (PDA) modified melamine foam (MF), this study achieves uniform dispersion of CIP and robust interfacial bonding. The results demonstrate that the PDA modification time and PAA content have a significant effect on the properties of composite aerogels. The composite aerogel achieves lowest thermal conductivity with 6 h modification time and 8% PAA due to the optimized structure. Moreover, the peak microwave absorption performance is attained with 18 h modification and 6% PAA, resulting from optimal interfacial polarization loss and impedance matching. This study achieves a balance between thermal insulation and microwave absorption performance through microstructure design, providing a solid foundation for advanced multifunctional materials.
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JOURNAL OF POLYMER SCIENCE
·
2026
·
IF 3.9
Desheng Kong,Jiaojiao Ma,Zuolin Wu,Zeyu Li,Shun Shi,Tong Yuan,Jianfeng Qian,Peibin Zhang,Jing Cui,Haiquan Guo
Intrinsically black polyimides hold great promise for applications in optoelectronics and flexible electronics. However, conventional preparation methods face challenges such as complex monomer synthesis, poor process compatibility, or compromised material performance. To address these challenges, this study developed a strategy that integrates “molecular design” with “in situ oxidation,”. In this study, four oxidizable diamine monomers with distinct side-chain structures were designed and synthesized: 2,4-diaminodiphenylamine (aniline side chain), 2,4-diamino-4′-naphthyl diphenylamine (naphthylamine side chain), 2,4-diamino-4′-biphenyl diphenylamine (4-aminodiphenyl side chain), and 2,4-diamino-4′-diphenylamine diphenylamine (4-aminodiphenylamine side chain). These monomers were copolymerized with ODPA to prepare the corresponding polyimide films. By introducing an oxidizing agent during the high-temperature film-forming process, in situ oxidation of side-chain aromatic amines is achieved, revealing how side-chain structure affects film properties. The results indicate that effective conjugation length and planarity of the side chains are key factors: the 4-aminodiphenylamine side chain yielded films exhibiting the best near-black appearance ( L * = 10.56) and the broadest visible light absorption ( λ max = 624 nm, T 300–700 = 1.2%) after oxidation. All films retained good thermal and mechanical properties ( T 5% > 324°C, tensile strength > 89 MPa). Graphical Four oxidizable diamine side chains control polyimide color via conjugation length and planarity. The 4-aminodiphenylamine unit gives a near-black film ( L * = 10.56) with broad visible absorption ( λ max = 624 nm, T ₃₀₀–₇₀₀ = 1.2%) after in situ oxidation, while retaining good thermal ( T ₅% > 324°C) and mechanical (> 89 MPa) properties.
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JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2026
·
IF 16.8
Zhenzhen Liu,Siqi Liu,Yan Wang,Yiyu Chen,Hairui Deng,Zhenlin Tan,Xin Zhao,Yinjun Chen,Meifang Zhu
Intrinsic coloration method of PI fiber is achieved by copolymerizing chromophore. • A broad-spectrum chromatic PI fiber library is constructed. • Chromatic PI fibers exhibit high colorfastness against extreme environment. • Intrinsic coloration method can be extended to conventional PI fibers. Due to the exceptional thermal stability, radiation resistance, and mechanical properties, polyimide (PI) fibers are widely used in various extreme environments. However, the intrinsic monochromatic golden hue and chemically inert surface of PI fiber give rise to a natural barrier to dyeing and low color fastness. Herein, a facile and transformative intrinsic coloration strategy for the dyeing of PI fibers is proposed by directly incorporating a perylene-based chromophore monomer into the backbone of PI. By tuning the concentration and categories of perylene derivatives, various intrinsic colors of PI fibers are afforded, constructing a diverse chromatic PI fiber library with a broad color gamut (spanning from warm tones to slate-grey). Significantly, the strategy successfully overcomes the long-standing trade-off between dyeing and mechanical integrity. Moreover, the incorporation of perylene-based chromophores exhibits excellent structural compatibility with the PI backbone, acting as reinforced components rather than stress-concentrating defects. Consequently, the fibers exhibit simultaneous enhancements in mechanical properties and exceptional color fastness against harsh environments. This work establishes a cost-effective and scalable paradigm for the functionalization of PI fibers, contributing to the expanding application of PI fibers in high-end textiles and smart wearables. Download: Download high-res image (238KB) Download: Download full-size image
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2026
·
IF 5.4
Haitao Shu,Shuhang Shi,Yixuan Wang,Xiaotian Peng,Zhicheng Wang,Yun Zhou,Lei Cai,Yuelong Liu,Jie Wang,Haijun Chen,Hao Peng
The PI aerogel based on DMBZ-PMDA exhibits high-temperature dimensional stability. • The specific surface area remains above 400 m 2 g −1 after treatment at 200 ℃. • The PI aerogel maintains high transmittance even after 200 °C heat treatment. • Heating shrinks the PI aerogel, enhancing its compressive strength. Polyimide (PI) aerogels combine a high specific surface area, high porosity, low thermal conductivity, and excellent high-temperature stability. However, their relatively low optical transmittance and insufficient dimensional stability at elevated temperatures limit their broader applications. In this study, three PI aerogels with distinct molecular structures were prepared by varying the dianhydride moiety, and their optical properties, mechanical performance, and thermal stability were systematically compared. Among them, the aerogel derived from 2,2′-dimethylbenzidine (DMBZ) and 1,2,4,5-benzenetetracarboxylic dianhydride (PMDA) exhibited the best light transmittance and thermal dimensional stability. By investigating the effects of heat treatment on the structures and properties of the materials, the structural evolution of the aerogel and the mechanisms underlying the related performance changes under high-temperature conditions were analyzed. After heat treatment at 200 ℃ under either Ar or air, the PI-PMDA aerogel retained a specific surface area above 400 m 2 g −1 and a transmittance exceeding 70% at 700 nm, indicating good preservation of its porous structure and optical performance. These results demonstrate that dianhydride structure design is an effective strategy for balancing optical transmittance and high-temperature dimensional stability in PI aerogels and provide a material basis for their potential use as support materials in future photothermal catalytic systems. Download: Download high-res image (313KB) Download: Download full-size image
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