JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2025
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IF 9.7
Xiaoxuan Wei,Yurui Deng,Xiangming Hu,Lihua Jiang,Longfei Han,Yuan Cheng,Mengdan Zhang,Zhiyuan Yang,Guoyu Han,Xinyue Yang,Hengyu Xu,Zhijun Zhang,Jinfeng Li,Duxi Li
Quasi-solid polymer electrolytes (QPEs) represent one of the most promising materials for replacing flammable liquid electrolytes in lithium-ion batteries (LIBs) to enhance safety. However, the key to their further industrialization lies in developing QPEs that simultaneously possess both superior safety characteristics and excellent electrochemical performance. To address this, this work developed a flame-retardant and electrochemically high-performance Poly (vinylidene fluoride- co -hexafluoropropylene) -Polyimide (PFP-PI) QPE. This electrolyte exhibits an ionic conductivity of up to 1.02 × 10 −3 S/cm at room temperature. Batteries assembled with this electrolyte demonstrate stable cycling performance, retaining 88.49% of their capacity after 900 cycles at a 1 C current density. The electrolyte also exhibits robust mechanical properties and effectively suppresses lithium dendrite growth. Furthermore, without incorporating additional flame retardants, it significantly reduces smoke emission during thermal events while maintaining its electrochemical performance, thereby lowering the hazard risk. Flexible pouch cells assembled using this electrolyte maintain electrical integrity upon bending and cutting, showcasing high safety performance.
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APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Yuqi Liu,Chengyuan Wang,Jiufeng Dong,Yujuan Niu,Zizhao Pan,Liang Sun,Yani Lu,Xuyang Wang,Li Li,Jiangyu Li,Jiannong Wang,Hong Wang
Nanofillers and polymer matrices are utilized to construct nanocomposites, offering a promising approach to enhance energy storage performance in harsh conditions. This strategy relies on structural design to introduce deep charge traps that regulate carrier transport within the material. However, comprehensive studies combining theoretical and experimental methods to elucidate how trap introduction by nanofillers improves capacitive performance remain limited. Here, we in-situ synthesized alumina (AO) nanosheets via a hydrothermal method and fabricated uniformly dispersed nanocomposites with polyimide (PI) as the matrix. Energy band theory revealed that AO nanosheets introduced deep charge traps at the PI-AO interface, substantially reducing leakage current density. High-resolution Kelvin probe force microscopy (KPFM) experimentally confirmed the presence of interfacial deep charge traps at the nanofiller/polymer interface. Thermally stimulated discharge current (TSDC) was further measured to characterize variations in trap depth and density among different materials. At 150 °C, the optimized nanocomposite achieved a high energy storage density of 2.72 J cm −3 with a charge–discharge efficiency exceeding 90 %, corresponding to approximately 448 % of the performance of pristine PI. This work bridges critical gaps between experimental observations and theoretical mechanisms, clarifying the role of interfacial charge traps in nanocomposite performance.
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Small
·
2025
·
IF 12.1
Man Liu,Feihua Liu,Hongmei Qin,Chuanxi Xiong,Hengxue Xiang,Liping Zhu,Meifang Zhu
Polymer dielectric films are widely used in advanced electronics, hybrid vehicles, etc., however, they encounter critical challenges, including significant thermal degradation and heightened leakage currents, which severely constrain their energy density and efficiency under high-temperature conditions. Herein, a novel strategy is proposed for constructing a polyimide (PI) alloy by incorporating high-bandgap copolymer of perfluoropropyl perfluorovinyl ether and tetrafluoroethylene (P(TFE-PPVE)) and fluorinated polyimide (FPI) as a compatibilizer. The highly oriented structural PI/FPI/P(TFE-PPVE) alloy is fabricated via knife casting, which utilized high shear forces to align the P(TFE-PPVE) blocks within the polyamide acid. Simulation results indicate that the high-bandgap P(TFE-PPVE) phase (9.72 eV) with an oriented structure in the PI matrix can effectively suppress electrical tree growth. Furthermore, deep carrier trap at the PI/P(TFE-PPVE) interface (2.98 eV) further reduces leakage current and enhances breakdown strength while minimizing conduction loss. As a result, the PI/FPI/0.25P(TFE-PPVE) alloy demonstrates remarkable dielectric stability under diverse conditions, achieving a discharge energy density of 3.75 J cm −3 with 90% efficiency at 150 °C and 550 MV m −1 . This straightforward blending strategy provides an effective pathway to modulate the condensed structure of all organic polymers, offering promising potential for high-performance polymer dielectrics.
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POLYMER COMPOSITES
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2025
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IF 4.7
Yonggang Guo,Yunfei Wu,Jiangbo Peng
In this study, a novel composite material has been prepared, which is composed of ultra-high molecular weight polyethylene (UHMWPE) with a small amount of polyimide (PI). The friction behavior of composites under dynamic speed and load conditions was investigated using a MDW-02G friction and wear testing machine. The frictional behavior of composites under low-speed with heavy-load (LSHL) dry friction and high-speed with light-load (HSLL) water lubrication conditions was studied separately. The tribological performance of the composites was analyzed on the basis of the coefficient of friction, wear rate, and wear morphology. The experimental results showed that the addition of PI enhances the thermal stability of UHMWPE-based composites. The defects of the UHMWPE surface vulnerable to fatigue wear under extreme working conditions were improved. Compared with UHMWPE, the wettability of PI modified composites was enhanced, and the lubricating film formed could better adhere to the friction interface. This effectively improved the lubrication conditions between the friction interfaces, while improving the wear resistance and reducing the coefficient of friction. It can be concluded that the thermal stability and wear resistance of UHMWPE-based water-lubricated bearings can be improved by a small proportion of PI enhancement, while ensuring that the composite material also has good self-lubricating properties. Highlights Low PI content enhances the thermal properties and wear resistance of composites. Under LSHL conditions, the wear rate in the composite can decrease by up to 93%. The wear mechanism of composites under LSHL and HSLL conditions was revealed.
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CHEMISTRY-A EUROPEAN JOURNAL
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2019
·Vol. 25
·期 38
·9045-9051
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IF 5.16
Lingchang Jiang,Pengyuan Wang,Meiping Li,Panpan Zhang,Jialu Li,Jia Liu,Yanhang Ma,Hao Ren,Guangshan Zhu
Graphical Lapping it up : A thermally and chemically stable, crystalline polyimide porous organic framework, was constructed by imidization of linear naphthalene-1,4,5,8-tetracarboxylic dianhydride with triangular 1,3,5-tris(4-aminophenyl)benzene. This material is capable of selective adsorption of C 2 H 2 over C 2 H 4 and CO 2 over N 2 (see figure). Utilization of porous materials for gas capture and separation is a hot research topic. Removal of acetylene (C 2 H 2 ) from ethylene (C 2 H 4 ) is important in the oil refining and petrochemical industries, since C 2 H 2 impurities deactivate the catalysts and terminate the polymerization of C 2 H 4 . Carbon dioxide (CO 2 ) emission from power plants contributes to global climate change and threatens the survival of life on this planet. Herein, 2D crystalline polyimide porous organic framework PAF-120, which was constructed by imidization of linear naphthalene-1,4,5,8-tetracarboxylic dianhydride and triangular 1,3,5-tris(4-aminophenyl)benzene, showed significant thermal and chemical stability. Low-pressure gas adsorption isotherms revealed that PAF-120 exhibits good selective adsorption of C 2 H 2 over C 2 H 4 and CO 2 over N 2 . At 298 K and 1 bar, its C 2 H 2 and CO 2 selectivities were predicted to be 4.1 and 68.7, respectively. More importantly, PAF-120 exhibits the highest selectivity for C 2 H 2 /C 2 H 4 separation among porous organic frameworks. Thus PAF-120 could be a suitable candidate for selective separation of C 2 H 2 over C 2 H 4 and CO 2 over N 2 .
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Polymer Chemistry
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2025
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IF 3.9
Xiaoqing Sun,Chongwen Yu,Xingyao Liu,Taolve Wang,Xigao Jian,Yujie Song,Jian Xu
Polyimide (PI) exhibits good thermal performance and high stability due to its highly rigid main chain and excellent mechanical properties, making it an ideal electrochromic material. However, its applicability is limited by poor solvent solubility, which results from the rigid backbone, and film yellowing, caused by charge-transfer complexes (CTC). Herein, a novel phenothiazine-based diamine (THZ-DA) was synthesized, where a universal joint-like structure was constructed during its formation. The introduction of the non-coplanar universal joint reduced intermolecular interactions and suppressed CTC formation, improving the solubility and enabling high transmittance of THZ-PIs in the neutral state. Moreover, the lone pair of electrons on the nitrogen atom of THZ allowed for the formation of a cationic radical (THZ+·) under electrochemical oxidation, which was stabilized by the resonance effect, enabling reversible color switching between colorless and orange–red state. Among the three systems, THZ-b, composed of THZ-DA and 3,3’,4,4’-biphenyl tetracarboxylic dianhydride, showed the best thermal stability, with a Td5% above 406 °C and Tg of 347 °C. It also exhibited good electrochemical cycling stability, with redox potentials of 1.09 and 0.88 V, as well as excellent electrochromic performance, achieving an electrochromic efficiency of 222 cm2 C–1. These results show the application potential of THZ-PI in smart windows and adaptive camouflage.
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HIGH PERFORMANCE POLYMERS
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2020
·
IF 1.568
Gang Lv,Songpei Xie,Danbo Mao,Ge Ren,Shibin Wu,Wei Yang
Mechanically robust optical homogeneous polyimide (PI) films with desirable atomic oxygen (AO) erosion duration were fabricated by initially synthesizing amine-functionalized hyperbranched polysiloxane (NH2-HBPSi), then reinforcing the pristine polyimide skeleton with it via copolycondensation reactions. NH2-HBPSi macromolecule imparts desirable AO survivability to the resulting hybrids. The mass loss per unit area of hybrid films had a downward trend with rising NH2-HBPSi content and AO dose before the complete silica protective layer was formed. It has been proven by the experiments in an underground simulated AO environment. It decreased to 1% of that of pristine polyimide when NH2-HBPSi accounted for 30% of the solid content after 24 h AO attack. The stable thickness uniformity that can meet the Rayleigh criterion was achieved in a 30 wt% HBPSi PI film, mainly due to the selection of the best process parameters. Meanwhile, 30 wt% HBPSi PI demonstrates satisfactory mechanical properties, with a tensile strength of 228.9 MPa and elongation at break of 7.3%. The characterization of scanning electron microscopy confirmed that pristine polyimide was substantially eroded after AO exposure while the surface morphology of 30 wt% HBPSi polyimide showed no evident change. The low AO erosion yield and prominent film thickness uniformity may find extensive usage in ultra-lightweight space diffractive optical elements (DOE) working in low earth orbit (LEO).
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JOURNAL OF MEMBRANE SCIENCE
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2025
·
IF 9
Lu Bai,Fangxu Fan,Zeyuan Gao,Tianyou Li,Yuao Wang,Zehua Li,Rongyu Lu,Ziyu Huai,Xinyue Wu,Gaohong He,Canghai Ma
The structure of polymer precursors critically determines the performance of carbon molecular sieve (CMS) membranes, yet the role of hydroxyl-containing, thermally rearrangeable units in polyimides remains underexplored. In this work, hydroxylated 6FDA-HAB and non-hydroxylated 6FDA-DABP were employed to systematically investigate the effect of benzimidazole formation on CMS structure and ethylene/ethane separation. Thermal rearrangement (TR) affects both graphitization and microporous architecture: low TR temperatures yield amorphous, low-porosity membranes, moderate TR temperatures enhance conjugated aromatic formation and molecular sieving, while excessively high TR temperatures induce densification that reduces permeability and selectivity. The TR400 membrane pyrolyzed at 800 °C achieved a C 2 H 4 permeability of 204.6 Barrer and a C 2 H 4 /C 2 H 6 selectivity of 15.8, surpassing the latest upper bounds. These findings elucidate the pivotal role of thermally rearranged structures and provide a rational strategy for designing high-performance CMS membranes for C 2 H 4 /C 2 H 6 separation.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2025
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IF 5.4
Shujiao Hou,Xiaoqing Xiong,Jing Guo,Wenhui Xiao,Fucheng Guan,Xinbin Ji,Yulong Xiang
Polyimide (PI) fabrics, next-generation aerospace/advanced protective core materials, are inherently recalcitrant to conventional dyeing due to their rigid, non-polar backbones, making coloration of high-performance garments a critical unmet challenge. While supercritical carbon dioxide (scCO₂) water-free dyeing technology is validated for chemical fibers, PI-focused studies are sparse, and scCO₂- in-situ functionalization coupling remains unexplored. Herein, a single-scCO₂-step “ in-situ functional dyeing” strategy for simultaneous PI coloration and functionalization is proposed. A sublimable anthraquinone disperse dye, Disperse Blue 359 (DB359), was selected as both the chromophore and the hydrophobic/thermal-insulating modifier; its low-surface-energy backbone and π-conjugated structure integrate coloration and functionality without the need for any post-treatment. After systematic optimization of temperature, pressure, and time, the optimal protocol was determined as 200 °C, 20 MPa, and 3 h. Under these conditions, the dyed PI fabric exhibited a K/S value of 12.38 ± 0.6, wash and rub fastness ratings of 4–5, a water contact angle (WCA) of 139.6° ± 1.4°, and a thermal conductivity as low as 0.0778 W · m⁻¹ · K⁻¹. This work achieves the synchronous coloration and multifunctional integration of high-performance PI textiles, thereby providing a platform for the design of colored and functional PI fabrics.
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CHEMICAL ENGINEERING JOURNAL
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2025
·
IF 13.2
Xiaofei Liu,Xingyao Dai,Jinghui Mao,Xin Zhen,Wei Qian,Yanan Ma,Xin Zhang,Ce-Wen Nan
The development of wearable electronics for use in extreme high-temperature environments, such as fire rescue operations and aerospace explorations, has created an urgent demand for flexible pressure sensors that exhibit both high sensitivity and high-temperature stability. Herein, a high-temperature flexible piezoresistive sensor was fabricated via controlled partial carbonization of a three-dimensional polyimide nanofiber network (PCPN). This sensor maintains high sensitivity up to 350 °C while preserving mechanical flexibility, representing the highest operational temperature ever achieved in polymer-based flexible sensors. The PCPN serves dual functions as both a structural flexible substrate component and a conductive sensing element, eliminating the necessity for additional conductive elements or complex composite architectures compared with traditional flexible pressure sensors. The PCPN-based pressure sensor with optimal carbonization degree demonstrates high sensitivity over a wide temperature range from ambient temperature (255.1 kPa −1 ) to 350 °C (94.8 kPa −1 ), fast response time (86 ms), and outstanding durability (9000 cycles at ambient temperature, 4500 cycles at 200 °C and 1000 cycles at 350 °C). As a proof of concept, the PCPN pressure sensor can be applied to not only real-time monitoring of human physiological activities but also to pressure identification in high-temperature environments, showcasing its potential for applications across a range of demanding conditions.
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Journal of Materials Chemistry A
·
2025
·
IF 9.5
Zihui Yu,Yan Wang,Yaoming Zhang,Qihua Wang,Tianqiang Yin,Zhancheng Zhang,Gai Zhao,Meizhe Yu,Xianqiang Pei
Due to their unique organic–inorganic hybrid structures, metal–organic frameworks (MOFs) have shown increasing potential as fillers for polymer self-lubricating composites. In this study, a systematic investigation of three structurally different MOFs (ZIF-8, MOF-5, and UiO-66, each at 3 wt%) in polyimide (PI) composite coatings revealed that their incorporation enhanced the mechanical properties. Notably, UiO-66 exhibited the most pronounced reinforcement, attributable to its strong interfacial bonding with the resin matrix, which led to an 18.4% increase in tensile strength as well as corresponding enhancements in elastic modulus and hardness. To gain insight into the friction and wear mechanisms of MOFs/PI composite coatings, ball-on-disc tests were complemented by molecular dynamics (MD) simulations and density functional theory (DFT) calculations. This combined approach elucidated the role of MOFs at the frictional contact interface and their influence on transfer film formation. The conclusions regarding the intrinsic relationship between the structure of MOFs and their tribological mechanisms are of both theoretical and practical importance for developing PI composite coatings for self-lubricating bushings, bearing shells and sliders.
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RSC Advances
·
2020
·Vol. 10
·期 4
·2368-2377
·
IF 3.119
Kui Cheng,Haoliang Li,Mohan Zhu,Hanxun Qiu,Junhe Yang
With the increasing demands of the electronics industry, electromagnetic interference (EMI) shielding has become a critical issue that severely restricts the application of devices. In this work, we have proposed a “non-covalent welding” method to fabricate graphene-polyaniline (Gr-PANI) composite fillers. The Gr sheets are welded with PANI via π–π non-covalent interactions. Furthermore, a flexible polyimide (PI) composite film with superior EMI shielding effectiveness is prepared by in situ polymerization. The 40% content of Gr-PANI10:1 (the mass ratio of Gr to PANI is 10 : 1) shows a superior electrical conductivity (σ) as high as 2.1 ± 0.1 S cm−1, 1.45 times higher than that of Gr@PI film at the same loading. Moreover, the total shielding effectiveness (SET) of EMI of the Gr-PANI10:1@PI reaches ∼21.3 dB and an extremely high specific shielding effectiveness value (SSE) of 4096.2 dB cm2 g−1 is achieved. Such a “non-covalent welding” approach provides a facile strategy to prepare high-performance PI-based materials for efficient EMI shielding.
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