CHEMICAL ENGINEERING JOURNAL
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2024
·
IF 13.3
Pengcheng Song,Zheng Xue,Peng Chen,Guohua Zhang,Qianqian Wang,Xiaoming Li,Weichao Chen
The rapid development of industry brings high-temperature polluting gases, which endanger the environment and human health. Therefore, achieving efficient gas filtration in a high-temperature environment is crucial. Silica aerogel was doped to fabricate polyimide (PI) nanofiber membranes by electrospinning for high-temperature resistance and high-efficiency filtration. The addition of silica aerogel retains the original excellent properties of the polyimide nanofiber membranes and increases the nanofiber surface area and the charge amount loaded on the surface. The filter efficiency of the prepared nanofiber membrane can reach 99.89 % for PM 0.3 at the gas flow rate of 35 L/min, and the corresponding pressure drop is only 52 Pa with a mass quality factor of 0.131. More importantly, the nanofiber membrane displays good filtration efficiency above 98 % at 300 °C for an extended period, which benefitted from the high-temperature resistant of polyimide and silica aerogel. Therefore, this work has great potential for high-temperature and high-efficiency air filtration.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Shiwei Chen,Dongfang Gao,Lixia Long,Wenxuan Cui,Chaofeng Zhu,Xue Wang,Bing Li,Yu Chen,Yuanyue Li,Chuanxing Jiang
Photothermal materials are considered as promising materials because they can convert clean solar energy into thermal and electrical energy. However, developing degradable photothermal materials with highly efficient solar-thermal-electric energy conversion performance remains a huge challenge. Here, a superhydrophobic bio-polyimide/carbon quantum dots aerogel (S-BioPI/CQDs) is synthesized. S-BioPI/CQDs exhibits superhydrophobicity (WCA = 155°) and super lipophilicity (OCA = 0°). Remarkably, S-BioPI/CQDs shows good solar-thermal-electric energy conversion properties. The surface temperature of S-BioPI/CQDs can be up to 80 °C within 68 s under the solar light irradiation of 1 kW m −2 . S-BioPI/CQDs has large crude oil adsorption capacity (up to 68.8 times as much as its own weight) and deicing under sunlight irradiation. Meanwhile, the output voltage can be up to 706 mV under the solar light irradiation of 5 kW m −2 . S-BioPI/CQDs can resist the impact of harsh environments, such as high temperatures, dynamic ocean environments, and strong acid environment. More importantly, S-BioPI/CQDs can be degraded completely within only 8 min. This is the first time to achieve the degradation of PI aerogel. This study provides a new and effective method to prepare advanced photothermal materials with degradable performances for the efficient use of solar energy to solve the fossil fuel crisis and protect the environment.
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PubMed
高影响因子
Materials
·
2024
·Vol. 17
·期 11
·2559
·
IF 3.1
Chengyu Huang,Peng Zhang,Bo Li,Mingchen Sun,Hansong Liu,Jinsong Sun,Yan Zhao,Jianwen Bao
Carbon-fiber-reinforced polyimide (PI) resin composites have gained significant attention in the field of continuous-fiber-reinforced polymers, in which the interfacial bonding between carbon fiber and matrix resin has been an important research direction. This study designed and prepared a water-soluble thermoplastic polyamide acid sizing agent to improve the wettability of carbon fiber, enhance the van der Waals forces between carbon fiber and resin and strengthen the chemical bonding between the sizing agent and the alkyne-capped polyimide resin by introducing alkyne-containing functional groups into the sizing agent. This study found that the addition of a sizing layer effectively bridged the large modulus difference between the fiber and resin regions, resulting in the formation of an interfacial layer approximately 85 nm thick. This layer facilitated the transfer of stress from the matrix to the reinforced carbon fiber, leading to a significant improvement in the interfacial properties of the composites. Adjusting the concentration of the sizing agent showed that composites treated with 3% had the best interfacial properties. The interfacial shear strength increased from 82.08 MPa to 108.62 MPa (32.33%) compared to unsized carbon fiber. This research is significant for developing sizing agents suitable for carbon-fiber-reinforced polyimide composites.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Juan Yu,Zhanying Ma,Xiaoyan Han,Shaozhuan Huang,Peng Mei,Qing Zhang
In the quest for next-generation energy storage solutions, lithium-sulfur (Li-S) batteries present exceptional potential due to their high energy density and cost-effectiveness. Nevertheless, significant challenges, such as the shuttle effect of lithium polysulfides (LiPSs) and inadequate sulfur utilization, have impeded their practical application. In this study, we report the design and synthesis of a novel covalent organic polymer that integrates a triazine-linked framework with carbonyl-enriched polyimide moieties, serving as a highly effective sulfur host for Li-S batteries. This engineered polymer not only provides abundant micropores for the physical confinement of LiPSs, but also facilitates robust chemical interaction through synergistic N-Li and O-Li bonding. The hierarchical porous architecture enhances sulfur loading, while the extended π-conjugation promotes rapid electron transport during LiPSs conversion. Consequently, the composite cathode achieves an impressive specific capacity of 1352 mAh g -1 at 0.1C, along with sustained cyclic stability (453 mAh g -1 after 400 cycles at 4C). These findings highlight the potential of multifunctional polymeric hosts in addressing critical limitations of Li-S batteries, offering a new blueprint for further developments in the field of high-performance energy storage systems.
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高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2025
·
IF 4.7
Bohan Yin,Fuying Pei,Hongge Jia,Yutong Shan,Mingyu Zhang,Shuangping Xu,Yanqing Qu
Due to the frequent occurrence of marine oil spill accidents, the ecological environment is facing severe threats. However, some traditional oil-water separation methods suffer from issues such as high cost, environmental unfriendliness and low efficiency. Therefore, there is an urgent need to develop a simple and efficient oil-water separation membrane. Leveraging the non-toxicity and abundance of hydrophilic groups (such as -carboxyl and -OH) in tannic acid, this study, for the first time, forms a hydrophilic coating on the surface of polyimide membrane (PI) through the complexation of tannic acid with ferric chloride hexahydrate, thus fabricating a superhydrophilic/superoleophobic membrane for oil-water separation. The water contact angle (WCA) of the modified membrane drops to 0° within 5 s, while the underwater oil contact angle (UOCA) reaches up to 142°. Moreover, under the action of gravity, the membrane not only achieves a high water flux of 2100 L·m -2 ·h -1 but also attains a removal rate of over 90 % for various oil-in-water emulsions. In addition, the modified membrane exhibits excellent resistance to acids, alkalis, and salts, as well as outstanding oil-fouling resistance. This promising material offers a universal modification strategy with broad applications in wastewater treatment.
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高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2021
·Vol. 31
·期 13
·2008006
·
IF 18.808
Hu Liu,Xiaoyu Chen,Yanjun Zheng,Dianbo Zhang,Ye Zhao,Chunfeng Wang,Caofeng Pan,Chuntai Liu,Changyu Shen
Inspired by the ultralight and structurally robust spider webs, flexible nanofibril-assembled aerogels with intriguing attributes have been designed for achieving promising performances in various applications. Here, conductive polyimide nanofiber (PINF)/MXene composite aerogel with typical “layer-strut” bracing hierarchical nanofibrous cellular structure has been developed via the freeze-drying and thermal imidization process. Benefiting from the porous architecture and robust bonding between PINF and MXene, the PINF/MXene composite aerogel exhibits an ultralow density (9.98 mg cm −3 ), intriguing temperature tolerance from -50 to 250 °C, superior compressibility and recoverability (up to 90% strain), and excellent fatigue resistance over 1000 cycles. The composite aerogel can be used as a piezoresistive sensor, with an outstanding sensing capacity up to 90% strain (corresponding 85.21 kPa), ultralow detection limit of 0.5% strain (corresponding 0.01 kPa), robust fatigue resistance over 1000 cycles, excellent piezoresistive stability and reproductivity in extremely harsh environments. Furthermore, the composite aerogel also exhibits superior oil/water separation properties such as high adsorption capacity (55.85 to 135.29 g g −1 ) and stable recyclability due to its hydrophobicity and robust hierarchical porous structure. It is expected that the designed PINF/MXene composite aerogel can supply a new multifunctional platform for human bodily motion/physical signals detection and high-efficient oil/water separation.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2025
·
IF 6.3
Jingzhi Rong,Jingyao Liang,Fubin Yang,Liaofeng Chen,Zhaohui Li,Gangtie Lei,Kailing Sun,Tongye Wei,Shuhong Xie,Yanhuai Ding
Gel polymer electrolytes (GPEs) are considered to promise the safety and high performance of lithium-ion batteries (LIBs), but fabrication of thin GPE membrane with high mechanical property remains a great challenge. Herein, we demonstrate that a robust polyimide nanofiber-reinforced GPE (P@PI) membrane can be fabricated by in-situ polymerization of low-molecular-weight poly(ethylene glycol diacrylate). Thanks to the fibrous structure, it presents not only close contact of electrolyte with electroactive particles but also strong mechanical strength in spite of 12 μm in thickness. It possesses a high ionic conductivity up to 1.18 × 10 −3 S cm −1 at 30 °C, a large lithium transference number of 0.61, and an electrochemical window of 4.84 V (vs. Li + /Li). Benefiting from the artificial solid electrolyte interface, the LiǁP@PIǁLi symmetrical cells achieve a stable long-term cycling over 600 h at 0.1 mA cm −2 . When assembled with the Li anode, the integrated cathode/GPE loaded with 10 mg cm −2 of LiNi 0.8 Co 0.1 Mn 0.1 O 2 can deliver a specific capacity of 130 mAh g −1 at 5 C rate and 30 °C, and retains 94.7 % of the initial capacity at 2 C rate after 500 cycles; when assembled with the graphite anode, it can also realize a capacity retention of 70.8 % at 1 C rate after 500 cycles. The results suggest that the thin GPE membrane prepared by this strategy can promote the development of quasi-solid-state LIBs significantly.
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高影响因子
TRIBOLOGY INTERNATIONAL
·
2024
·
IF 6.1
Hui Liu,Huimin Qi,Song Li,Zenghui Yang,Ga Zhang,Gai Zhao,Yafeng Zhang,Jiaxin Yu
Exploring the tribological mechanism of the shape memory polymers plays an important role in designing intelligent lubricating materials. Here, a series of shape memory polyurea (PUA)/polyimide (PI) were prepared and their tribological performance were investigated. The result showed that the friction and wear of PUA/PI were higher at shape memory transition temperature (T trans ) than at 200 ℃ and room temperature (RT). However, introducing PUA units into PI enhanced its shape memory stability and tribological performance. SEM and XPS analysis revealed that introducing PUA promoted the formation of polymer-based tribofilm. Molecular dynamics simulations further illustrated that the high relative atomic concentration of PUA/6PI at the sliding interface improves the bonding between the tribofilm and the counterpart, thereby improving overall tribological performance.
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高影响因子
Nanoscale Horizons
·
2025
·
IF 6.6
Yingying Tian,Jun Tong,Xingang Yu,Tianqi Zhao,Rui Wang,Xiubing Huang
Phase change materials have significant application prospects in thermal energy storage and management. However, challenges such as low thermal conductivity, liquid leakage and solid rigidity have hindered their practical application. In this study, a dual encapsulation strategy was adopted, using highly-oriented graphite framework (HOGF) as the large framework and polyimide/carbon nanotube (PI/CNTs) aerogel as the small framework to construct an oriented carbon skeleton with high thermal conductivity. Subsequently, it was used to impregnate n-octadecane (OD), and composite phase change materials (OHPC-x) with bidirectional high thermal conductivity, heat storage and high photothermal performance were successfully prepared. The increase of OD endows OHPC with excellent heat storage capacity, and the enthalpy value of OHPC-2 can reach 164.46 J/g. In addition, the lamellar structure of HOGF provides phonon transmission channels, endowing the OHPC composite with a relatively high in-plane thermal conductivity (5.8913 W/m·K). CNTs, as thermal conductive fillers and light collectors, can not only expand the heat transfer area but also reduce thermal resistance. Their addition enabled OHPC to achieve an enhanced axial thermal conductivity (2.2934 W/m·K) and a high photo-thermal conversion rate (86.9%). The developed composite material has achieved a perfect combination of multiple functions and holds great application potential in the efficient utilization of solar energy, building thermal management, and the protection of electronic equipment.
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PubMed
高影响因子
POLYMER
·
2025
·
IF 4.5
Xiang Li,Xilong Chen,Zicheng Shan,Guangtao Qian,Chuyang Luo,Hui Zhang,Liying Zhang,Jianyong Yu
Achieving high thermal conductivity of shape memory polyimides without compromising their shape memory performance and mechanical properties is challenging. To solve this issue, a molecular structure design strategy was employed to synthesize a range of sequence-controlled block copolyimides through the introduction of soft segments into rigid segments, thereby regulating molecular chain mobility. An intrinsically thermally conductive shape memory block copolyimides with rapid shape recovery speed, exceptional shape memory and mechanical properties were achieved. Through regulating the proportion of soft segments, strong physical cross-linking structures, including π-π stacking interactions and molecular chain entanglements, were generated, ultimately achieving shape fixity and recovery ratios of 97.4 % and 99.6 %, respectively. Owing to their relatively ordered molecular structures, which contributed to high intrinsic thermal conductivity, the developed copolyimides displayed a rapid shape recovery speed of 3.5 s at a trigger temperature of 275 °C. The molecular structure design strategies employed might offer deep insight into the exploration of shape memory polyimides.
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高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Guangyu Duan,Fengying Hu,Yabing Wang,Wenxuan Shao,Ruopu Xu,Duo Lu,Zuming Hu
To meet the urgent requirements of cutting-edge power electronics and electrical systems at elevated temperatures, all-organic sandwich-structured dielectric films were successfully designed and fabricated based on the aramid nanofiber film (ANFm) and polyimide (PI) layer via the convenient “dipping and pulling” technique. On account of the flat surface and formed electron traps, the PI-ANFm-PI (P-A-P) dielectric films exhibit enhanced breakdown strength (Eb) and reduced leakage current density compared to the single-layered ANFm at elevated temperatures. The P-A-P dielectric film shows a maximal discharge energy density (Ud) of 3.68 J/cm3 with a charge–discharge efficiency (η) exceeding 80% at 25 °C and an impressive Ud of 1.76 J/cm3 with η above 70% at 150 °C, outstandingly surpassing the performances of single-layered ANFm and pure PI dielectric film. With the exceptional energy-storage properties, the all-organic sandwich-structured P-A-P films have been demonstrated to be promising candidates for high-temperature electrical energy storage.
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高影响因子
ACS Applied Nano Materials
·
2025
·
IF 5.5
Yiwei Wang,Guan Wang,Li Zhang,Bilal Iqbal Ayubi
Solid-state transformers (SSTs) are critical components in modern power systems, requiring insulation materials with high thermal conductivity and low dielectric loss to withstand prolonged high-frequency electrical stress and elevated temperatures. Although polyimide (PI) is widely used in SSTs, its low thermal conductivity and high dielectric loss limit its long-term performance. To address these challenges, we developed polydopamine-modified boron nitride nanosheets (BNNS-PDA) as fillers for PI composites. The PDA modification significantly improves the compatibility between BNNS and the PI matrix, resulting in composites with enhanced thermal conductivity (0.679 W/(m·K) at 5 wt %, 2.2 times that of pure PI) and reduced dielectric loss (0.00617 at 20 kHz, 37% lower than pure PI). These improvements lead to a 65% increase in high-frequency aging lifetime under 3 and 20 kHz, as well as a 62.5% reduction in surface temperature rise under 2 and 20 kHz. Molecular dynamics (MD) simulations reveal that PDA modification increases the interfacial interaction energy and hydrogen bond density between the BNNS and PI, enhancing interfacial stability. Density functional theory (DFT) calculations further visualize and quantify intermolecular hydrogen bonding interactions. When integrated with phase-field modeling, these enhanced interactions are reflected by elevated energy barrier parameters (α), effectively delaying electrical breakdown, and mitigating Joule heating under high-frequency conditions. However, excessively high α values accelerate the breakdown, highlighting the need to optimize doping levels for balanced performance. This study provides a multiscale understanding of the relationship between interfacial modifications and macroscopic performance, offering a practical strategy for designing high-performance insulation materials for high-frequency applications.
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