POLYMER COMPOSITES
·
2025
·
IF 4.7
Liang Yu,Qian Wu,Tao Li,Shuai Yuan,Shuangquan Fang,Jiuxin Zhang
Polyimide (PI) materials are highly valued in tribological applications due to their excellent friction-reduction and wear-resistance properties under extreme conditions. However, their relatively low tensile properties limit their effectiveness as standalone materials, necessitating reinforcement. Poly(p-phenylene benzobisoxazole) (PBO) fibers, known for their superior mechanical and tribological properties, struggle with effective interfacial bonding with PI due to low surface activity. This gap in effective reinforcement strategies is critical for advancing PI applications. Here, we address this challenge by anchoring graphene oxide (GO) nanosheets onto PBO fibers using rare-earth (lanthanum) ions, producing RE-GO-RE-PBO fibers with a multi-scale reinforcement structure. The study involved optimizing the rare-earth solution (RES) concentration and characterizing the fiber surfaces. Our results indicate that an optimal RES concentration of 0.3 wt% achieves uniform and stable GO deposition, significantly enhancing interfacial bonding with the PI matrix. The resulting RE-GO-RE-PBO/PI composite exhibited a 91.74% increase in tensile strength and a 58.44% increase in modulus compared to pure PI, alongside improved wear resistance and a low friction coefficient. These findings present a novel strategy for designing high-performance tribological composites by integrating rare-earth-modified nanomaterials into fiber-reinforced matrices. This approach not only addresses the critical challenge of enhancing interfacial bonding but also provides a theoretical and experimental foundation for advanced applications in aerospace and other high-tech sectors, pushing the boundaries of tribological material performance.
研究领域:
材料科学
·
摩擦学
·
聚合物复合材料
·
纳米材料
·
表面工程
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产品关联
DOI
高影响因子
TRIBOLOGY INTERNATIONAL
·
2025
·
IF 6.9
Zhen Jia,Conghui Dong,Weiming Lin,Hao Li,Liwei Ou,Huimin Qi,Yafeng Zhang,Ga Zhang
To solve the severe friction and wear problem of bearings in aircraft engine low-pressure compressors, polyimide (PI)/layered double hydroxide (LDH)/diamond-like carbon (DLC) double-layered coatings were fabricated, and their tribological performance were investigated in a high temperature range. Results showed that the PI/1.0LDH/DLC double-layered coating exhibited an ultralow friction coefficient of 0.06 at 300 °C, demonstrating a reduction of over 60 % compared to both single-layer PI and DLC coatings under high-temperature conditions. A uniform carbon-based tribofilm was formed from the double-layered coating, endowing the sliding interface with exceptional lubrication performance. The findings of this study offer novel strategies for the development of solid lubricant coatings intended for high-temperature applications.
研究领域:
材料科学
·
表面工程
·
摩擦学
·
航空航天工程
·
固体润滑
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产品关联
DOI
高影响因子
ACS Applied Polymer Materials
·
2024
·
IF 4.4
Yang Xu,Luwei Bo,Yandong Wang,Haocheng Xu,Xiaolin Jiang,Zhaobo Wei,Kai Xi
Lightweight and flexible polyimide foams (PIFs) with superior thermal and acoustic properties are high in demand for advanced aerospace and industrial machinery, however, traditional foams cannot offer both satisfactory acoustic and thermal insulation simultaneously. In this study, we successfully develop a new class of flexible PIFs by incorporating amino-functionalized hyperbranched polysiloxanes (NH2–HBPSi) into ammonium salt oligomer (PAES) through a thermal foaming process. The complex viscosity (η*), microfoaming behavior of PAES and cell morphology of the resulting PIFs are precisely controlled by tuning the ratio of NH2–HBPSi/4,4′-diaminodiphenyl ether (ODA). Significantly, PIFHBPSi-4, a hybrid PIF with a NH2–HBPSi loading of 33.3% and exceptional thermal property (T5% exceeded 480 °C), exhibits a normalized compressive strength of 3.47 kPa/(kg·m–3) at room temperature (over 10 times higher than commercial PIFs) and a noise reduction coefficient (NRC) of 0.375, which substantially improved compared to previously reported polyimide composites. Additionally, NH2–HBPSi can form a dense oxide layer at high temperatures, impeding the transmission of heat. This allows PIFHBPSi-4 to withstand a 10 min exposure to a high heat flux of 50 kW/m2 without any significant erosion. These lightweight, flexible, thermally resistant, and acoustically superior hybrid PIFs have the potential to revolutionize applications in high-tech fields such as aerospace, acoustics, and aviation.
研究领域:
材料科学
·
航空航天工程
·
声学
·
热管理
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DOI
高影响因子
Advanced Fiber Materials
·
2026
·
IF 21.3
Zhong Yuanyuan,Ma Lijun,He Pengfei,Huang Liangkang,Lu Yuyan,Li Jianwei
Aerogels have emerged as ideal materials for extreme environments due to their excellent thermal insulation. However, conventional aerogels often suffer from poor mechanical properties, limited thermal stability, and inadequate breathability. Herein, a fluorinated polyimide (FPI) nanofibrous aerogel with ultralight weight, and high mechanical strength is constructed by moisture-assistant electrospinning for self-powered sensing. Due to the rapid phase transition of the charged jet through interaction between the fluorinated polyamic acid solution (FPAA) and water molecules, enabling the interweaving and cross-linking of nanofibers into a fluffy aerogel structure. Furthermore, the resulting FPI nanofibrous aerogels exhibit exceptional thermal insulation property with low thermal conductivity (0.045 W·m −1 ·K −1 ), super-hydrophobicity with water contact angle of 151° and superior moisture permeability of 10150 g/(m 2 ·24 h). Moreover, the FPI nanofibrous aerogels show excellent piezoelectric properties (up to 34 V), rendering them ideal candidates for next-generation wearable electronics, particularly in high-precision physiological signal monitoring applications. In addition, the speech recognition system was able to recognize everyday sentences with precise detection of pauses and intonations. This work presents a novel strategy for designing FPI-based nanofibrous aerogels, paving the way for their practical applications in thermal insulation and self-powered sensing under extreme environmental conditions. Graphical abstract
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产品关联
DOI
高影响因子
Journal of Macromolecular Science Part B-Physics
·
2019
·
IF 1.204
Chao Su,Feng Xue,Fanglin Xu,Tongsheng Li,Yuanshi Xin,Mingming Wang
To improve the wear resistance of carbon fabric reinforced polyimide (CF/PI) composite, surface-modified graphene (MG) was synthesized and employed as a filler. The flexural strength, Rockwell hardness and thermal properties of the composites were tested. The composites were also evaluated for their tribological properties in a ring-on-block contact mode under dry sliding conditions. The results showed that the wear rate of MG reinforced CF/PI composites was reduced when compared to unfilled CF/PI composite. It was found that the 1 wt% MG filled CF/PI composites exhibited the optimal tribological properties. The worn surface, wear debris and transfer films were analyzed by scanning electron microscopy (SEM) and optical microscopy (OM) with the results helping to characterize the wear mechanism.
研究领域:
材料科学
·
摩擦学
·
聚合物复合材料
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DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2026
·
IF 5.4
Baolei Qiao,Yuan Yao,Xiaofeng Li,Long Liu,Hui Li,Yanqiang Zhang
The separation of isomers—particularly those with highly similar molecular sizes and physical properties—remains a significant challenge. In this study, a polyimide (PI) composite membrane was employed to achieve efficient separation of pyrazoline/ketazine isomers by leveraging steric hindrance effects and hydrogen bonding interactions between the molecules and the membrane surface. Separation experiments were conducted with the PI membrane for ketazine/pyrazoline isomer mixtures with different substituents and concentration gradients. The results demonstrated that a separation factor of ketazine exceeding 10 could be achieved when the pyrazoline-to-ketazine ratio was 0.1. This work provides fundamental experimental data and technical support for the industrial-scale separation of pyrazoline/ketazine isomers, and thus facilitates the development and application of cyclopropane-based high-energy aerospace fuels.
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产品关联
DOI
高影响因子
JOURNAL OF POLYMERS AND THE ENVIRONMENT
·
2026
·Vol. 34
·期 5
·121
·
IF 5.6
Shan Chao,Liu Zhongying,Wu Shanshan,Qu Junjie,Mo Junhao,Sun Xiaoyi,Liu Chanjuan,Huang Xiaohua
In this work, polyethyleneimine (PEI)-functionalized multi-walled carbon nanotubes (PEI@MWCNTs) were synthesized by coating pristine MWCNTs with PEI. Subsequently, mixed matrix membranes (MMMs) containing various loadings of PEI@MWCNTs were fabricated by incorporating the aminated nanotubes into FFBA (a fluorinated copolyimide, synthesized from 6FDA, FPPAB, and BAMF) matrix. This modification strategy takes advantage of the low-diffusion-resistance tubular structure of MWCNTs to facilitate gas transport, while the abundant amino groups of PEI serve as active sites for CO 2 molecules. The PEI@MWCNTs/FFBA MMMs exhibited superior thermal stability compared with the pristine FFBA membrane. X-ray diffraction (XRD) analysis revealed that the incorporation of carbon nanotubes expanded the interchain spacing within the PI matrix, thereby increasing the free volume of the membrane. Gas permeation tests showed that, at a PEI@MWCNTs loading of 3 wt%, the CO 2 permeability increased by 74%, while the CO 2 /N 2 selectivity improved by 46%. These results indicate that the incorporation of PEI@MWCNTs enables simultaneous improvements in both gas permeability and selectivity, thus mitigating the conventional permeability–selectivity trade-off typically observed in polymer membranes. This work offers a novel and effective strategy to enhance interfacial interactions between dispersed nanomaterials and the PI matrix, showing great promise for practical gas separation applications.
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DOI
高影响因子
ACS Omega
·
2026
·
IF 5.2
Shilong Bai,Ping Gao
Electrospun polyimide (PI) nanofiber separators hold promise for high-performance lithium-ion batteries due to their exceptional thermal stability and affinity for electrolytes. However, their practical application is limited by inadequate mechanical integrity and large, nonuniform pores that fail to suppress lithium dendrite growth. To address these challenges, we developed a “self-composite” strategy that integrates electrospinning with non-solvent-induced phase separation (NIPS). This method produces a hierarchical self-composite polyimide (SCPI) separator, featuring a robust electrospun PI nanofiber scaffold infilled with and bonded by a NIPS-derived PI matrix. The resulting monolithic composite exhibits a 230% increase in tensile strength over a pristine electrospun membrane and a significant decrease in average pore size from the micrometer scale (∼1–5 μm) down to 200–500 nm. This uniform nanoporous structure and superior wettability effectively homogenize lithium-ion flux, enabling dendrite-free lithium plating/stripping even at a high current density of 5 mA/cm2. Consequently, Li/LFP pouch cells with SCPI separators achieve outstanding long-term stability, retaining 98.75% of their initial capacity after 800 cycles at 1 C with a Coulombic efficiency exceeding 99.99%. This scalable approach offers an effective pathway to engineer advanced membrane structures for safe, high-performance, next-generation lithium batteries.
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DOI
PubMed
高影响因子
ACS Applied Polymer Materials
·
2025
·
IF 4.7
Zhi Li,Yumin Duan,Kai Shen,Jiahui Chen,Miao Liu,Qiong Liu
Polyimide aerogels (PIAs) exhibit excellent thermal insulation and fire resistance, offering significant application potential in various fields such as lithium-ion batteries. However, their pronounced thermal shrinkage at elevated temperatures and high hygroscopicity severely limit their broader applicability in harsh environments. Herein, a cost-effective strategy is proposed by incorporating highly thermally stable silica aerogels (SAs) into PIAs to fabricate SA/PIA composite aerogels. The results demonstrated that when the content of the SA reached 30%, the composite showed an optimal comprehensive performance. Compared to the pure PIA, the radial shrinkage decreased from 14.5% to 11.28%, and the peak of thermal decomposition temperature increased by 26.3 °C. Furthermore, the hydrophobicity of the SA/PIA composite aerogels showed a positive correlation with the SA content, with the water contact angle increasing from 46.1° to 98.3° as the SA loading increased. Notably, the SA effectively suppressed thermal shrinkage of the PIA, reducing the volumetric shrinkage at 300 °C from 92.4% to 58.4%. This work presents a feasible approach to mitigate thermal shrinkage and enhance the hydrophobicity of the PIA, thereby broadening its potential application in severe service environments.
研究领域:
材料科学
·
高分子化学
·
热工工程
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产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2022
·
IF 7.336
Bo Jiang,Taoying Kong,Zehua Cai,Weichen Zhu,Rengui Xiao
Low conductivity severely limits the application of polymer materials in dual-ion batteries (DIBs), which results in high voltage drop and capacity degradation. In this paper, a strategy of in-situ modification is proposed, which utilize the adsorption of Na + by polyimide (PI) anode to destroy the symmetric conjugation effect, thus the cycle performance is greatly improved. In this dual-ion battery (PI/NaCl-DIB), polyimide material mixed with trace amounts of NaCI (PI/NaCl), natural graphite (NG) and 1-ethyl-3-methylimidazolium bis(trimethylmethane sulfonyl)imide salt (EMImTFSI) pure ionic liquid are used as anode, cathode and electrolyte, respectively. Due to the addition of NaCI in electrochemical process, the storage mechanism of cations on polyimide anode is changed, and capacity performance is also improved. PI/NaCl-DIB has a maximum capacity of 79 mAh g − 1 at 1 C and still discharges 45 mAh g − 1 at a large rate of 5 C after 300 cycles, with a capacity retention of 96%, while the battery with pure polyimide (PI-DIB) only has 25.0 mAh g − 1 at 1 C. The mechanism of NaCI in the polyimide anode materials is investigated by SEM, XRD, XPS, and CV, and the in-situ modification model is constructed for PI/NaCI anode in DIB.
研究领域:
材料科学
·
电化学
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DOI
高影响因子
RSC Advances
·
2021
·Vol. 11
·期 57
·36066-36077
·
IF 3.361
Wu Bai,Yunhua Lu,Zhizhi Hu,Guoyong Xiao,Hongbin Zhao,Jianmin Zhu,Zhaobin Liu
In this work, a triarylimidazole-containing diamine 2-(4-methylphenyl)-4,5-bis(4-(4-amino-2-trifluoromethylphenoxy)phenyl)imidazole (MPBAI) was firstly synthesized and polymerized with 1,2,3,4-cyclobutanetetracarboxylic dianhydride (CBDA) to prepare transparent polyimide (PI) films by means of thermal imidization. Then, inorganic nanoparticles including silica (SiO2), alumina (Al2O3) and silicon nitride (Si3N4) were separately introduced into the PI(MPBAI-CBDA) with different mass fractions of 0.02%, 0.10%, 0.50% and 2.50% to obtain three series of PI nanocomposite films. All these films were close to colorless and transparent, although the light transmittance showed a downward trend due to the introduction of nanoparticles. Moreover, as the content of inorganic nanoparticles increased, the fluorescence intensities of these films were increased. Comparatively, the improvement effect of nano-SiO2 was the most obvious. When the content of SiO2 was 2.50%, the maximum intensity of the fluorescence absorption peak was increased by 9.6 times, and the absolute fluorescence quantum yield reached 17.2%, about 5.2 times that of the original PI film. Moreover, the maximum absorption peak produced a red shift of 85 nm due to the addition of 2.50% Si3N4, which was probably caused by the weakening of fluorescence quenching effect and high permittivity. The nanocomposites exhibited high glass transition temperatures of around 300 °C and excellent thermal stabilities. The surface hydrophobicity was changed by adjusting the mass and type of nanoparticles. Thus, this work provided a simple way to improve the photoluminescence effect by introducing the nanoparticles. The functional films will be expected to be applied in some optical applications.
研究领域:
材料科学
·
光学
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DOI
高影响因子
POLYMER SCIENCE SERIES A
·
2025
·Vol. 66
·期 4
·575-581
·
IF 1.1
Jianrong Hang,Zheng Jiajia,Yu Juan,Huang Pei,Wang Xiaodong
Polyimide exhibits high optical transparency, exceptional thermal properties, robust mechanical characteristics, and dimensional stability. However, conventional polyimides typically do not possess luminescent properties, which significantly restricts their applicability in the domain of optoelectronic devices. A viable approach to address this limitation involves the incorporation of fluorescent powders into polyimide films, thereby ensuring that the films maintain their practical utility while also exhibiting certain fluorescent properties. In this study, we synthesized yttrium oxide (Y 2 O 3 ), which possesses fluorescence characteristics, and incorporated it into polyimide films. The introduction of Y 2 O 3 not only imparts fluorescence to the films but also enhances their thermal stability while preserving their mechanical integrity. The glass transition temperature of the modified films is approximately 300°C, and the tensile strength exceeds 85 MPa, surpassing the industry application standards.
研究领域:
材料科学
·
光电子学
·
高分子科学
·
纳米技术
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DOI
高影响因子
危险品化学品经营许可证（带存储）