JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2024
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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
·
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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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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JOURNAL OF MEMBRANE SCIENCE
·
2015
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IF 5.056
Jinchao Li,Yaping Zhang,Shuai Zhang,Xiaodong Huang
We report the fabrication and properties of high performance and inexpensive composite membranes of sulfonated polyimide (SPI) and sulfonated molybdenum disulfide (s-MoS 2 ) for the vanadium redox flow battery (VRFB) application. Scanning electron microscopy (SEM) images reveal the uniformity of SPI/s-MoS 2 membrane. Both EDS and XRD results verify the existence of s-MoS 2 in SPI/s-MoS 2 membrane and show the interaction between SPI and s-MoS 2 . The physico-chemical properties of as-prepared SPI/s-MoS 2 membrane, including water uptake and ion exchange capacity, etc. are evaluated and compared to those of SPI, SPI/MoS 2 and Nafion 117 membranes, respectively. The SPI/s-MoS 2 membrane possesses increased proton conductivity and reduced vanadium ion permeability than pure SPI membrane, and it has the highest proton selectivity (2.24×10 5 S min cm −3 ) among all membranes. The VRFB with SPI/s-MoS 2 membrane presents a higher coulombic efficiency ( CE ) and energy efficiency ( EE ) compared with Nafion 117 at the current density ranging from 20 to 80 mA cm −2 . The SPI/s-MoS 2 membrane shows a longer discharge time (193 h above 0.8 V) than Nafion 117 (72 h). Moreover, the SPI/s-MoS 2 membrane exhibits stable operation performance up to 500 cycles with no significant decline in CE and EE . All experimental results confirm that the SPI/s-MoS 2 membrane is suitable for use in VRFB.
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JOURNAL OF APPLIED POLYMER SCIENCE
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2016
·Vol. 133
·期 28
·
IF 1.866
Baoming Li,Zhiyin Wu,Li Lin
A novel organosoluble polyimide (PI) with pyrimidine ring in the main chain was synthesized by chemical and thermal imidization, respectively, from 3,3′,4,4′-benzophenone tetracarboxylic dianhydride and 2,4-diamino-6-chloropyrimidine as raw materials and its molecular structure, solubility, UV–visible absorption characteristic, crystallinity, thermal stability, electrochemical behaviors, and mechanical properties were also studied. It was found that the introduction of pyrimidine ring in the main chain could increase the solubility of PI in polar aprotic solvents at room temperature and 60 °C, respectively, because of its molecular main chain with asymmetric structure and two polar N atoms in pyrimidine ring. Furthermore, PI had strong optical absorption peak intensity, excellent thermal stability, good redox reversibility, especially outstanding mechanical properties, which were conductive to its potential applications in adhesives, polyelectrolyte, separation membrane, and so on. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133 , 43680.
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RSC Advances
·
2017
·Vol. 7
·期 11
·6323-6335
·
IF 3.108
Yuanshi Xin,Tongsheng Li,Dafei Gong,Fanglin Xu,Mingming Wang
A three-step strategy was employed to prepare a self-lubricating and anti-wear graphene oxide/nano-MoS2 (GO/nano-MoS2, abbreviated GMS) hybrid by chemical compounding as a novel multidimensional assembly. This development aims to overcome the high friction coefficient of GO/polymer composites and to explore the variations in the tribological properties stemming from the different nanoparticles immobilized on the GO surface. The as-prepared GMS was incorporated into a polyimide (PI) matrix to yield GMS/PI composites by in situ polymerization. The mechanical, thermodynamic, surface, and tribological properties of the GMS/PI composites were investigated, and the synergistic effects of the abovementioned properties between nano-MoS2 and GO were discussed in detail. A homogeneous dispersion of GMS, a suppressive and protective effect of graphene sheets, a rolling friction effect of the detached nano-MoS2 particles, and a transfer film composed of MoS2 were achieved herein, contributing to the enhanced tribological properties. The differences in the enhancement effects of nanohybrids can be mainly attributed to two aspects: the intrinsic characteristics of the assembled nanoparticles and the combinational structure of the multidimensional assemblies.
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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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CHEMICAL ENGINEERING JOURNAL
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2024
·
IF 13.3
Hong Chen,Jindong Huang,Chao Zhang,Peng Gao,Hongchang Huang,Junlan Li,Juncheng Liu
A foldable polyimide (PI) protective layer with high transmittance and high ultraviolet (UV) resistance is crucial for the practical application of flexible solar cells. Herein, the commercially 2,2′-Bis(trifluoromethyl) benzidine (TFMB) and 4,4′-(hexafluoroisopropylidene) diphthalic anhydride (6FDA) as the monomers, and five ionic liquids (ILs) as the regulators were used to synthesize PI/IL films (PI/IL1, PI/IL2, PI/IL3, and PI/IL4). The outcomes reveal that the average transmittance ( AT ) of PI/IL1 (50 μm thickness) outperforms others, which can be attributed to the expanded π-π stacking distance between PI molecules and the intermolecular multipoint interaction between IL1 and PI. The AT and the elongation at break ( ε ) of PI/IL1 increase sequentially with the 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([C 2 mim][NTf 2 ])/TFMB mole ratio, and those of PI/IL1-3 reach the maximum values of 94.23 % and 49.42 % at a 3:1 ratio, respectively. However, the tensile strength ( σ ) of the PI/IL1 film is inferior to that of the pure PI film, and consistently decreases with the increase of [C 2 mim][NTf 2 ]/TFMB mole ratio. Nevertheless, the UV-induced degradation of PI can be delayed through the [C 2 mim][NTf 2 ] regulation. The attenuations of AT , σ and ε of PI/IL1-3 films after 1000 equivalent solar hours (ESHs) UV irradiation are 0.85 %, 14.63 % and 2.99 %, respectively, which are significantly lower than those of pure PI films (2.23 %, 32 % and 23 %). This is attributed to the interaction between the positive and negative charges from [C 2 mim][NTf 2 ] and those from the PI chain breaking. The highest occupied molecular orbital (HOMO) and the lowest unoccupied molecular orbital (LUMO) of PI/IL1-3 are calculated with the density functional theory to reveal the charge transfer between [C 2 mim][NTf 2 ] and PI.
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高影响因子
COMPOSITES PART B-ENGINEERING
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2024
·
IF 12.7
Haiming Liu,Xiangdong Wang,Chuntai Liu,Hao-Yang Mi,Yaqiao Wang,Shihong Chen
Thermosetting polyimide (PI) foams (PIFs) are usually synthesized through chemical foaming; however, this approach is environmentally toxic, and it is difficult to regulate the cell structure, remold the foam, and increase the foam compressive strength . The development of microcellular PIFs with ultrahigh compressive strength and high volume expansion ratio remains a challenge. Herein, thermoplastic PI with a branched structure and flexible ether bonds was synthesized through solution polymerization , and microcellular thermoplastic PIFs (TPIFs) with ultrahigh strength were fabricated via supercritical-carbon-dioxide foaming using 2,4,6-triamino pyrimidine (TAP) as a chain-extender monomer . Subsequently, a lattice model of a closed tetrakaidecahedral cell was used to clarify the relation between the foam compressive strength and polymer cell structure. Experimental results indicate that the optimal thermal imidization temperature is 230 °C and that the resulting branched structure considerably improves viscoelasticity , flame retardancy, and foaming performance. A TAP content of 0.75 g results in branched-structure TPIFs with a mean cell size of 16.8 μm. Notably, at high temperatures and pressures, the compressive strength of TPIFs with 0.75 g TAP is more than nine times of that of TPIFs without TAP. Increasing the TAP content beyond 0.75 g results in a crosslinked structure. Backward differentiation shows that TPIF compression is constant at 0.14–0.18 in the [0,0,1] lattice direction. The proposed physical foaming method is environment-friendly and can sustainably produce TPIFs with a high volume expansion ratio, an adjustable microcellular structure, and outstanding mechanical properties.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Xinran Sun,Daiming Liu,Zhibing Xuan,Yongtao Zhang,Guodong Zhang,Chen Chen,Mengting Sun,Yan Lin,Jie Zhong,Fei Wang
Hydrate has been endowed with great potential in energy storage and transportation. However, the kinetics of its formation process has been a challenge, often requiring dynamic mechanical processes that are energy-intensive and cumbersome to operate. Herein, a well-designed expanded graphite (EG)/polyimide (PI) foam was first explored as fixed bed for the formation of methane hydrate. The results demonstrate that the EG/PI fixed bed exhibits a remarkable performance in hydrate formation under static conditions, with a high gas storage capacity of 149 V/V, a short induction time and a rapid formation rate of 13.1 V·V −1 ·min −1 at 6 MPa and −2 °C, and excellent recyclability, which are attributed to its stable micro/macro structures. Thereinto, the pores of EG serves as gas adsorption and reaction sites, initialing the formation with extremely short induction time. The three-dimensional framework of PI foam supports the uniform dispersion of EG particles and enables the efficient formation of hydrate under static condition. The EG/PI fixed bed decreases the water freezing point and leads to a high supercooling that facilitates the rapid nucleation of hydrate. Meanwhile, the fixed bed provides extensive mass-transfer channels, sufficient growing space, and superior heat conductivity, which contribute to the hydrate growth under static condition. This work not only offers a novel strategy for fabricating high-performance fixed bed, but also provides an insight into its promotion mechanism in hydrate formation.
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高影响因子
POLYMER
·
2024
·
IF 4.1
Long Ni,Yinfu Luo,Xiaochuang Di,Xiaoting Liao,Liwei Yan,Mei Liang,Shengtai Zhou,Huawei Zou
In this study, heterocyclic diamine 2-(4-aminophenyl)-5-aminobenzimidazole (APBIA) was employed as a co-polymerization component to improve the properties of polyimide foams (PIFs) which were synthesized from 3,3′,4,4′-benzophenone tetracarboxylic acid dianhydride (BTDA) and 4,4′-diaminodiphenyl ether (ODA). The rheological behavior of polyester ammonium salt (PEAS) precursors was regulated by introducing APBIA moieties to the chain backbones, which affected the foaming behavior of PEAS and the microstructure of corresponding PIFs. Anisotropic porous structure was constructed with the help of microwave-assisted foaming strategy due to the directional growth of foam pores, which led to anisotropic mechanical and thermal insulation performance of resultant PIFs. PIFs demonstrated robust mechanical performance in the vertical direction (i.e., parallel to pore growth direction) and mechanical flexibility (compression response rate of 97.1–99.0 %) in the horizontal direction (i.e., perpendicular to the pore growth direction). The co-polymerized PIFs also presented excellent thermal insulation performance, with thermal conductivity ranging from 0.0266 to 0.0517 W/(m·K) within a temperature range of 25∼300 °C. In addition, PIFs exhibited exceptional thermal stability and flame retardancy performance, which demonstrate a great potential for high-temperature thermal protection applications. To summarize, multifunctional PIFs with excellent mechanical, thermal insulation and flame retardancy were successfully prepared by adopting co-polymerization strategy and microwave-assisted foaming technique, which have promising applications in high-end engineering sectors.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Hao Fu,Libo Yang,Lei Dong,Mingyue Ma,Yuxiang Deng,Yuezhou Wei,Shunyan Ning,Hanyu Wu,Xinpeng Wang
The extraction of uranium from seawater poses significant challenges due to the low uranium concentration, high salinity, wave crash, and microbial presence, requiring comprehensive performance evaluation of the adsorbent for pre-applications. To address these challenges, the in-situ generated cobalt borate/polyimide aerogels (CoBO@PIA) with customizable shapes are proposed as effective adsorbents for U(VI) extraction. Experimental results demonstrated that CoBO@PIA-2 exhibits a high adsorption capacity ( q max of 812.2 mg/g) and cost-effectiveness (0.685 $/g). The antimicrobial characteristics mitigate bacterial interference, ensuring the reliability and effectiveness of U(VI) extraction. In the presence of S. aureus , Vibrio alginolyticus and E. coli at a concentration of 10 4 CFU/mL, CoBO@PIA demonstrated a remarkable 696 %-1387 % increase in adsorption capacity compared to PIA. Moreover, the durability of these adsorbents enhances their longevity and reusability. Noteworthy is the autocatalytic behavior of the Co(BO 3 ) 0.81 @PIA, resulting in a decreased Gibbs free energy of the CoBO@PIA-2. In this process, where Co(II) transfers electrons to U(VI), facilitating the reduction of U(VI) to U(V/IV). During desorption, Co(III) receives electrons, achieving an internal cycle of electrons, facilitating re-reduction to the initial valence ratio range (1.24:1–1.13:1). This mechanism enables efficient reuse of CoBO@PIA-2 materials. thereby streamlining the adsorption process and improving overall extraction efficiency. The synergistic combination of cobalt borate and polyimide aerogel yields unique properties, including autocatalytic behavior, salt tolerance, and antimicrobial activity, making it suitable for diverse applications, including small modular reactors.
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