ACS Applied Polymer Materials
·
2026
·
IF 5.2
Chenying Li,Junhui Wang,Hongyan Wang
The present study focuses on the application of hydroxyl-containing polyimide (HPI) nanofiber membranes as separators in lithium-ion batteries. The fabrication of hydroxyl-containing polyimide nanofiber membranes was accomplished through electrostatic spraying, utilizing poly(amide acid) (PAA) solutions with varying solid contents (20%, 23%, 25%, 27%). A hydroxyl-containing diamine was selected as one of the monomers. SEM characterization indicates that the HPI-25 sample exhibits optimal nanomorphology and pore structure. As demonstrated in the relevant literature, the HPI separator displays relatively high levels of ionic conductivity (1.81 mS·cm–1 at 25 °C), which are 2.2 times those of the PP separator and 1.12 times those of the PI separator. It has been demonstrated that the strong polar modification of the hydroxyl group (−OH) leads to an increase in electrolyte wettability. Furthermore, the weak coordination of Li+...O–H has been shown to increase the lithium ion migration number to 0.79. In the LiFePO4 || Li battery system, the discharge specific capacity of HPI-25 can reach 161 mAh·g–1 after 200 cycles at a 1C rate. This finding demonstrates the pivotal role of selecting appropriate monomers with functional groups in determining the overall performance of polymer membranes.
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ACS Applied Polymer Materials
·
2026
·
IF 5.2
Yuecheng Ma,Letian Jin,Yuqian Lin,Can Chen,Ning An,Fuhao Song,Yanbao Li,Sheng Cui
Abstract As high-frequency communication technologies shift carrier frequencies into the millimeter-wave regime, legacy protective substrates show increasingly poor electromagnetic transparency, creating a fundamental mismatch between their wave-transmitting capability and the stringent low-loss requirements of next-generation communication architectures. Polyimide aerogel substrates, characterized by ultralow dielectric constant and loss, sufficient mechanical strength, and moisture resistance, have garnered significant attention. 2,2′-Bis(trifluoromethyl)-4,4′-diaminobiphenyl (TFMB) as a fluorinated monomer and more economical modified carbon fibers as crosslinkers were introduced to prepare a polyimide aerogel. The polyimide aerogel exhibits an exceptionally high porosity of >93%, with an average pore size ranging from 15.2 to 27.0 nm. Their dielectric constant ranges from 1.05 to 1.11, with dielectric loss between 0.112% and 1.025% (8.2–12.5 GHz). With their unique combination of ultralow density, excellent mechanical properties, high thermal stability, low thermal conductivity, and moisture resistance, our polyimide aerogels are highly promising for high-frequency communication applications.
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Polymers
·
2025
·Vol. 17
·期 11
·1428
·
IF 4.9
Bowen Zheng,Jing Li,Ning Li,Wa Li,Shuai Zhang,Haile Lei
A soluble photosensitive polyamide ester precursor (BAFPAE) was synthesized through copolymerization of 2,2-bis [4-(4-aminophenoxy)phenyl]hexafluoropropane (HFBAPP) with 4,4′-(4,4′-isopropylidenediphenoxy)bis(phthalic anhydride) (BPADA). Hydroxyethyl methacrylate (HEMA) was incorporated as a photosensitive functional group, and a transparent photosensitive polyimide film was obtained by thermal curing of the precursor film. The effects of reaction temperature and varying HEMA equivalents on the mechanical properties of the film were systematically investigated. The results indicated that the formation of polyacrylate-polyimide interpenetrating polymer networks (IPNs) was pivotal in preserving the mechanical integrity of the material. The optimized BAF-x-yexhibited a toughness of 12.69 MJ m3, a Young’s modulus of 2.86 GPa, an elongation at break of 21.16%, and a tensile strength of 92.68 MPa.
研究领域:
材料科学
·
高分子化学
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高影响因子
POLYMER
·
2025
·
IF 4.5
Wen Li,Jun Lin,Wei Chu,Xuanning Zhang,Jun Fang,Qiangli Zhao,Jianwei Li
The conductive fiber is a vital component for wearable devices to accurately monitor the health state of humans. However, the fabrication of flexible fiber-based sensors with high sensitivity still remains a challenge. Herein, we designed a wearable sensor based on fluorine-containing polyimide (PI) nanofiber coated with poly(3,4-ethylenedioxythiophene): poly(styrene sulfonic acid) (PEDOT:PSS) composites that derived from fluffy and multilayer PI nanofibrous aerogels. The performance of PI nanofibrous aerogels sensors can be properly adjusted by changing the relative proportion of hydrophilic and hydrophobic molecular units in molecular chains. The as-prepared sensors can accurately identify different states (normal breathing, deep breathing, rapid breathing, etc.) for respiratory monitoring. In particular, the fabricated sensor can realize effective detection of tiny humidity on the surface of human skin, and the longest detection distance can reach 3.5 cm. This work offers an insightful chemical strategy to design wearable moisture-sensitive sensors to realize human motion recognition, exercise status, and undisturbed respiratory monitoring.
研究领域:
材料科学
·
生物医学工程
·
电子工程
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Materials Research Express
·
2020
·Vol. 6
·期 12
·125358
·
IF 1.929
Chao Huang,Fangfang Niu,Guangxia Xie,Jinhui Li,Changqing Li,Ying Wang,Fei Ji,Guoping Zhang,Rong Sun,Ching-Ping Wong
Polyimide (PI) with excellent mechanical, thermal, dielectric properties which has been widely applied in electronics, automotive, high-speed rail and chemical industrie. However, the high curing temperture has limited its application in the micro-electronic areas. To address this issue, quinoline (QL) with uique catalytic effect was employed in low temperature curable PI. The changes in chemical structure of the PI films at different temperature was confirmed by FTIR spectroscopy with controlled addition of QL. The effects of QL content on the electrical, thermal and mechanical properties of polyimide were discussed as well. It was found that PI-1.5 has been proved with the best property which exhibited high imidization rate of 99.6% at 200 °C, dielectric constant of 3.20 and a dielectric loss of 5.06 × 10−3 (1 MHz). Besides, the Young's modulus of as much as 1.66 GPa, elongation at break of more than 145% with high tensile strength about 134 MPa have been achieved. Moreover, the T5 is more than 545 °C and the glass transition temperature is higher than 376 °C. The developed low temperature curable PI is expected to be applied in the advanced electronic packaging such as fan-out wafer package, insulation, interlayer dielectric and so forth.
研究领域:
材料科学
·
电子工程
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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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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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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Jianhong Guo,Leyan Zhang,Chunhua Zhang,Dandan Zhong,Weihao Long,Jieyao Qin,Zhuan Fu,Sijie Zhou,Junyao Gong,Heng Pan,Hua Ji,Lixin Du,Liangjun Xia
Water is the source of life and the largest energy carrier on Earth. Various excellent hydrovoltaic technologies have been proposed, but still suffer from issues such as intermittent output, material limitations, and poor flexibility. Here, we proposed a method for fabrication of a hydrovoltaic generator using the flexible polyimide fabric. Carbon black was deposited on the polyimide fabric surface using a simple method of candle flame burning. On the basis of water transport in the fabric and charge separation induced by negatively charged carbon black channels, sustainable hydrovoltaic power generation was achieved by the generator. A single carbon deposited polyimide fabric (CBP) could generate a continuous voltage output of nearly 260 mV by dripping a water drop on one side. Multiple CBP devices were connected in series and parallel to increase output power, which could be applied for the power and energy storage of small electronic devices. This work may provide a convenient strategy for fabricating sustainable flexible hydrovoltaic generators and offer insights for the development of clean power sources.
研究领域:
材料科学
·
能源技术
·
环境科学
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高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Jun Lin,Jianwei Li,Yutong Song,Wei Chu,Wen Li,Fei Liu,Xinhai He,Qiangli Zhao,Hang Zhao
The fabrication of carbon aerogels with ultralow density, high electrical conductivity, and ultraelasticity still remains substantial challenges. This study utilizes electrospun polyimide aerogel as the source to fabricate flexible carbon nanofibrous aerogel (PI-CNA) capable of multifunctional applications. The lightweight PI-CNA based piezoresistive sensor shows a wide linear range (0–217 kPa), rapid response/recovery time, and fatigue resistance (12,000 cycles). More importantly, the superior pressure sensing enables the PI-CNA for all-range healthcare sensing, including pulse monitoring, physiological activity detection, speech recognition, and gait recognition. Moreover, the EMI SE and the A coefficient of the PI-CNA reach 45 dB and 0.62, respectively, indicating the outstanding absorption dominated EMI shielding effects due to the multiple reflections and absorption. Furthermore, PI-CNA exhibits satisfying Joule heating performance up to 120 °C with rapid response time (10–30 s) under low supply voltages (1.5–5 V) and possesses sufficient heating reliability and repeatability in long-term repeated heating/cooling cycles. The fabricated PI-CNA shows significant potential applications in wearable technologies, energy conversion, electronic skin, and artificial intelligence.
研究领域:
材料科学
·
传感技术
·
能源转换
·
人工智能
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PubMed
高影响因子
POLYMER
·
2024
·
IF 4.1
Yifan Li,Jiahui Li,Wenhao Zhang,Qiyun Lin,Lingcheng Chen,Zhihuan Weng,Yi Xiao
The flammability and hydrophilicity of epoxy resins hinder their applications in the high-tech fields of aerospace and electronics. To break these limitations, a highly rigid and hydrophobic polyimide structure has been designed as the harder for epoxy resins. This diamine monomer polyimide (PI–OH) featured a new spiral fluorene-xanthene core doubly grafted phenolic hydroxyl units, to match the commercial bi-trifluoromethyl dianhydride monomer. The curing performance of the polyimide PI-OH was studied in a concentration gradient fashion with the epoxy resin N, N, N′, N′-tetraglycidyl-4, 4′-diaminodiphenylmethane (TGDDM), and compared to the benchmark curer 4, 4′-diaminodiphenyl sulfone (DDS). Due to the unique structural rigidity of spiral crosslinks and the compatibility of the polyimide, the cured PI-OH/TGDDM exhibited Young's modulus of 6.18 GPa and a hardness of 480 MPa, 27.7% and 42.3% higher than that of DDS/TGDDM, demonstrating excellent comprehensive performance. The introduction of PI-OH also reduced the curing temperature with higher curing activity. Resin with 40% loading of the polyimide reached a residual carbon rate of 49.0% at 700 °C (under nitrogen), presenting flame retardancy superior to DDS/TGDDM. Furthermore, the involvement of trifluoromethyl groups reduced the surface free energy and hydrophilicity, lowering the water absorption rate for the modified epoxy resin. This study opens an avenue for comprehensively improving the performance of epoxy resins at lower curing temperatures, which has broad application prospects in aerospace and motor vehicle fields.
研究领域:
材料科学
·
化学工程
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高影响因子
Polymers
·
2024
·Vol. 16
·期 3
·393
·
IF 4.7
Xiaoyu Du,Shijun Zhao,Yanqing Qu,Hongge Jia,Shuangping Xu,Mingyu Zhang,Guoliang Geng
Imidazole ionic liquids (ILs) have good affinity and good solubility for carbon dioxide (CO2). Such ionic liquids, combined with polyimide membrane materials, can solve the problem that, today, CO2is difficult to separate and recover. In this study, the ionic liquid (IL) of 1-ethyl-3-methylimidazolium tetrafluoroborate (IL1), 1-pentyl-3-methylimidazolium tetrafluoroborate (IL2), 1-octyl-3-methylimidazolium tetrafluoroborate (IL3), and 1-dodecylimidazolium tetrafluoroborate (IL4) with different contents were added to a polyimide matrix, and a series of polyimide membranes blended with ionic liquid were prepared using a high-speed mixer. The mechanical properties and gas separation permeability of the membranes were investigated. Among them, the selectivity of the PI/IL3membrane for CO2/CH4was 180.55, which was 2.5 times higher than the PI membrane, and its CO2permeability was 16.25 Barrer, which exceeded the Robeson curve in 2008; the separation performance of the membrane was the best in this work.
研究领域:
材料科学
·
环境工程
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DOI
PubMed
高影响因子
Materials Today Communications
·
2025
·
IF 4.5
Yuan Niu,Chao Xiao,Mengyue Hu,Xianglan Liu,Xin Ding,Meng Xue,Xingyou Tian,Kang Zheng,Xian Zhang
The power density of flexible electronics, foldable devices and wearable devices is becoming increasingly high, posing higher requirements for the out-of-plane thermal conductivity of flexible substrates. This paper reports a polyimide (PI) film with excellent out-of-plane thermal conductivity and flexibility prepared with homemade hexagonal alumina (h-Al 2 O 3 ) flakes. With higher crystallinity, more regular geometry and larger diameter-thickness ratio, self-prepared h-Al 2 O 3 is more likely to lap out-of-plane to form a continuous and efficient heat conduction network. The PI/ h-Al 2 O 3 composite film exhibits higher thermal conductivity than that of PI/commercial spherical alumina (c-Al 2 O 3 ) composite film at the same mass fraction. The out-of-plane thermal conductivity of the PI composite film loaded with 40 % h-Al 2 O 3 reaches 1.53 Wm −1 K −1 , 1.91 times higher than that of PI/ c-Al 2 O 3 composite film (0.80 Wm −1 K −1 ). Additionally, PI/h-Al 2 O 3 composite film exhibits excellent electrical insulation, high flexibility and enhanced thermal stability. This work provides an effective method to address the deficiency of out-of-plane thermal conductivity of PI film.
研究领域:
材料科学
·
热管理技术
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高影响因子
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