SURFACE & COATINGS TECHNOLOGY
·
2025
·
IF 6.1
Guoshuang Hua,Meng Cai,Xiaoqiang Fan,Minhao Zhu
Polyimide (PI) demonstrates exceptional thermal stability but suffers from limited wear resistance, restricting its applications in friction environments. Herein, we repot a mechanically blended Ti 3 C 2 T x MXene-PI composite coating with optimized interfacial bonding. Leveraging the exceptional mechanical properties of Ti 3 C 2 T x , the composite coating achieves remarkable performance enhancements. The experimental results reveal that the Ti 3 C 2 T x MXene-PI coating shows outstanding mechanical properties, with hardness, tensile strength, and fracture stress values of 228.7 MPa, 64.46 MPa, and 40.55 MPa, respectively. Additionally, it exhibits superior thermal stability (T g = 347.8 °C). Compared to the PI coating, the wear rate of the Ti 3 C 2 T x MXene-PI coating under low and high loads is reduced by 47.34 % and 72.03 %, respectively, and the wear width decreases by 158 μm and 209 μm. Molecular dynamics (MD) simulation results show that Ti 3 C 2 T x has a higher binding energy with PI-precursor solution (−20.4 kcal/mol). This enhancement is attributed to the robust interface interactions between the abundant functional groups on the surface of Ti 3 C 2 T x and PI, ensuring uniform dispersion of Ti 3 C 2 T x within the PI matrix and achieving effective dispersion strength. This study reveals a significant correlation between the wear resistance of Ti 3 C 2 T x -enhanced polyimide coatings and key thermal/mechanical parameters, offering new insights for the design of high-performance wear-resistant materials.
研究领域:
材料科学
·
摩擦学
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Communications
·
2025
·
IF 4.5
Zeyu Li,Shun Shi,Tong Yuan,Desheng Kong,Jianfeng Qian,Jiaojiao Ma,Haiquan Guo
To solve the problem of aqueous development of photosensitive polyimide (PSPI) in the advanced packaging field at this stage through the main chain structure design which leads to its poor thermal and mechanical properties, this paper proposes a new structural design method based on the side-chain-type polyamide ester (PAE, PSPI precursor) to achieve aqueous development of PSPI. The method introduces a water-soluble tertiary ammonium salt group into the PAE side chain to obtain a water-soluble side-chain polyamide ester, which in combination with the solvation inhibitor diazonaphthoquinone (DNQ), can achieve high-resolution aqueous development patterning (up to 1 μm). The tertiary ammonium salt-containing side chain is completely removed in the imidisation stage, which does not affect the properties of the main chain of PSPI itself. The method was applied to three PSPIs with different rigid structures, and good thermal and mechanical properties of the PSPIs were obtained while aqueous development patterning was achieved, which proved the practicality of the method.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2018
·Vol. 30
·期 1
·1-8
·
IF 2.324
Chi Qingguo,Gao Zhiyou,Zhang Changhai,Zhang Tiandong,Cui Yang,Wang Xuan,Lei Qingquan
In this paper, the sandwich structured polyimide composite films were studied, in which two layers of pure polyimide films were covered on both sides of BZT-BCT@Fe 3 O 4 /PI composite films. The result indicated that composite films with doped BZT-BCT@Fe 3 O 4 had a significant performance in dielectric properties. The phases and microstructures of BZT-BCT@Fe 3 O 4 and sandwiched composite films were studied by means of XRD, TEM and SEM. It was found that Fe 3 O 4 was present and randomly coated on BZT-BCT. The measured dielectric properties of the composite films show great increased dielectric constant. The dielectric strength of the composite films decreases with the volume fraction raising, however, the relatively high values can be obtained when the fillers content is lower than 5 vol.%. The energy storage density increases significantly at small volume fractions, but decreases significantly at 7 vol.% due to reduced dielectric strength. On the whole, the composite films exhibit higher energy storage density and excellent discharge efficiency when the volume fraction is less than 7%, and the discharge efficiency is still higher than 85% at 265 kV/mm.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2020
·
IF 7.183
Guining Chen,Xi Chen,Yang Pan,Yufan Ji,Gongping Liu,Wanqin Jin
Mixed-matrix membranes (MMMs) based on metal-organic frameworks (MOFs) molecular sieves have been extensively studied in gas separation due to the high performance and good compatibility of MOF with polymers. In this work, 6FDA-based polyimides MMMs incorporating M-gallate (M = Ni, Co, Mg) MOF particles were fabricated for the first time and investigated for ethylene/ethane (C 2 H 4 /C 2 H 6 ) separation. By reducing synthesis temperature and introducing agitation, the Ni-gallate particles synthesized in flask (Ni-gallate(F)) with optimized conditions are smaller than Ni-gallate synthesized in autoclave (Ni-gallate(A)). The particle size was reduced from ~7 μm (Ni-gallate(A)) to ~0.8 μm (Ni-gallate(F)), which enables the formation of uniform MMMs. Because of the better compatibility with polyimide and higher adsorption performance of Ni-gallate than Mg-gallate and Co-gallate, the 6FDA-DAM MMM containing Ni-gallate(F) was capable of simultaneously improving C 2 H 4 /C 2 H 6 selectivity and C 2 H 4 permeability whereas the MMM with Mg-gallate(F) or Co-gallate(F) failed in performance enhancement. The 6FDA-DAM MMM with Ni-gallate(F) loading of 20% exhibited optimal C 2 H 4 /C 2 H 6 separation performance that surpassed the upper-bound of pure polymers. Detailed analysis of sorption and diffusion coefficients suggested that the enhanced transport properties in Ni-gallate(F) MMMs were attributed to the increase of sorption coefficient provided by the higher C 2 H 4 sorption capacity and selectivity, as well as the favorable gas diffusivity via moderately confined pores of the incorporated Ni-gallate(F) fillers.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
MACROMOLECULAR CHEMISTRY AND PHYSICS
·
2024
·
IF 2.5
Yu Yang,Tianyue Zheng,Juan Qin,Jingling Yan,Zhen Wang
A versatile strategy of preparing colored polyimide (PI) films is developed by embedding colored monomers on the backbones of colorless substrate polymers. Intrinsically colored PI films of four colors—red, yellow, blue, and purple—are prepared by introducing relative chromophores to the substrate PI that are synthesized from 2,2′-bis(trifluoromethyl)benzidine (TFMB) and 4,4′-(hexafluoroisopropylidene) diphthalic anhydride (6FDA)—two widely used monomers for colorless and transparent PI films. In addition, a series of orange and green PI films are prepared by simple mixing of the red, yellow, or blue PIs. The properties of these colored PI films are characterized, exhibiting good mechanical, thermal, and solubility properties, as well as different color and brightness depending on the amounts and types of chromophores. The optical properties of these films are determined by UV–vis spectroscopy and Commission Internationale de I'Eclairage (CIE) Lab. It is demonstrated that the introduction of even small amounts of chromophores can afford spectrally colored films while maintaining the original benign properties of the substrate PIs.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
Analytical Methods
·
2025
·
IF 2.6
Zuhang Ding,Jianzheng Wang,Jing Jin,Min-jie Guo,Qinran Li,Zhi Fan,Jin Zhao
This research describes a novel electrochemical sensor based on a polyimide-silver nanowire (PI-AgNWs) composite that is used to modify a glassy carbon electrode (GCE) for the simultaneous detection of multiple nitrophenol isomers (NPs) with high performance. The synergistic effect from polyimide (PI) doped silver nanowires (AgNWs) improved the selectivity and sensitivity of the fabricated sensor. First, the AgNWs was prepared by polyol process, and then composited with PI to obtain the target composite. Subsequently, the composite was characterized in detail and was used to modify GCE for the NPs detection. Afterwards, electrochemical measurements were performed to simultaneous detection for three NPs. Under the optimal condition, the results exhibited that the linear detection range of 1-400 μM for 4-nitrophenol (4-NP), 1-350 μM for both 2-nitrophenol (2-NP) and 3-nitrophenol (3-NP) and the limit of detection (LOD) were 0.081 μM for 2-NP, 0.107 μM for 3-NP, and 0.063 μM for 4-NP, respectively. In addition, the fabricated electrode exhibited excellent reproducibility (RSDs of 2.85% for 2-NP, 2.71% for 3-NP, and 1.80% for 4-NP, respectively) and stability (RSDs of 6.17% for 2-NP, 2.36% for 3-NP, and 3.89% for 4-NP, respectively) over multiple measurements. Moreover, the sensor showed excellent anti-interference capability and was successfully applied to detect NPs analytes in real water samples with recoveries ranging from 91.1% to 109.0%. This study emphasizes the potential application of PI-AgNWs composites for the rapid detection of NPs in the environment.
研究领域:
分析化学
·
环境监测
·
纳米材料
·
电化学传感
·
污染物检测
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Hanling Guo,Jingyi Kong,Shixiao Wang,Hejian Li,Enhui Zhang,Fengxian Gao,Xiang Lin,Min Gong,Liang Zhang,Dongrui Wang
Aqueous zinc-ion batteries (AZIBs) have gained significant attention for large-scale energy storage due to their high safety, environmental friendliness, and cost-effectiveness. However, the lack of high-performance separators remains a major obstacle to their commercialization. In this study, a composite nanofiber membrane composed of polyacrylonitrile (PAN) and polyimide (PI) is fabricated via electrospinning. The PAN/PI composite nanofiber membrane (63 μm-thick) exhibits an average fiber diameter of 431.2 nm, a porosity of 83.9%, an elastic modulus of 24.65 MPa, and a high Zn2+ transference number of 0.68. It significantly enhances the cycling stability of zinc-based batteries. Zinc symmetric cells (Zn||Zn) maintain a long cycle life of 2750 h at a current density of 1 mA cm–2 and a capacity of 1 mAh cm–2. Zinc–copper asymmetric cells (Zn||Cu) retain an average Coulombic efficiency of 99.3% after 701 cycles. When paired with a ZnxV2O5 (ZVO) cathode, the Zn||ZVO full cell delivers an initial specific capacity of 204.7 mAh g–1 at 5 A g–1 and retain 86.9% of their capacity after 1000 cycles. Furthermore, at a discharge current of 0.5 A g–1, the full cell achieves an energy density of 25.95 Wh L–1, approximately six times higher than that of conventional glass fiber separator systems.
研究领域:
电化学储能
·
材料科学
·
纳米材料
·
电池技术
·
高分子材料
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2025
·
IF 3.9
Xu Chengcheng,Yu Juan,Huang Pei,Wang Xiaodong
Composite electrode materials combining conductive polymers with carbon-based frameworks have shown great potential in advanced energy storage applications. In this work, polyaniline (PANI)-coated polyimide carbon microsphere (PI-C) composites (PANI/PI-C) with optimizing feed ratios were synthesized by in situ polymerization. PI-C serves as an excellent support for PANI, creating a synergistic effect that significantly, achieves superior electrochemical performance. The results show that 50% is the most appropriate addition amount of PI-C, the composite demonstrated an impressive specific capacitance of 540 F g −1 at 0.5 A g −1 , and under a higher current density of 10 A g −1 , it maintained a significant capacitance of 412.9 F g −1 . After 5000 charge–discharge cycles, it preserved 90.4% of its original capacitance. Furthermore, when assembled as a symmetric supercapacitor, it achieved an energy density of 12.7 Wh kg −1 at a power density of 249.9 W kg −1 , retaining 83.1% of its capacitance after 5000 cycles at a current density of 5 A g −1 . These results demonstrate the excellent electrochemical performance and structural stability of PANI/PI-C composites, highlighting their application prospects in high-performance supercapacitors and broader energy storage technologies. Graphical abstract
研究领域:
材料科学
·
电化学
·
能量存储
·
纳米技术
·
高分子科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Storage
·
2025
·
IF 9.8
Zhichao Pang,Lizhu Guan,Tianyu Hu,Ling Weng,Yi Jin,Jie Chen,Minghui Xu,Dongming Shi,Weiyu Wang
High-temperature polymer dielectrics are extremely critical for modern electronic and electrical systems. Unfortunately, the energy storage performance of dielectric polymers is dramatically deteriorated due to carrier injection and transport at elevated temperatures. In this paper, polyimide/zirconia nanoclusters dielectric composites are designed using a “site isolation” co -polymerization method. Based on the quantum size effect, ultrasmall zirconia nanoclusters (ZOCs) have a wider bandgap compared to conventional-sized zirconia nanoparticles (ZrO 2 NPs), which can increase the depth of carrier traps in dielectric composites to inhibit carrier transport better. The resulting composites exhibit superior high-temperature energy storage performance, including the maximum discharged energy density of 5.45 J/cm 3 and the charge-discharge efficiency of 87.5 % under 600 MV/m at 150 °C. This work offers a promising avenue to design high-temperature polymer dielectrics for energy storage applications.
研究领域:
材料科学
·
电气工程
·
纳米技术
·
高分子科学
·
储能技术
✓ 已验证
产品关联
DOI
高影响因子
Science Advances
·
2025
·Vol. 11
·期 37
·
IF 12.5
Weilin Feng,Fupeng Li,Jiaqi Li,Zhiyi Li,Lu Xu,Hukang Guo,Nanwen Li,Xinzhong Cao,Chuanjie Fang,Baoku Zhu,Liping Zhu
Conventional fractionation of liquid hydrocarbons relies on energy-intensive distillation. While organic solvent reverse osmosis provides an energy-efficient alternative, the challenge lies in engineering membranes with accurately tailored molecular differentiation for complex hydrocarbons. Here, we develop diverse fluorinated polyimide membranes featuring programmable polymer chain architectures for efficient hydrocarbon separation. By stoichiometry-controlled polycondensation, the chain packing and microporosity of synthesized polyimides are finely regulated, verified by molecular simulations. The corresponding asymmetrical membranes with defect-free thin layers of 100 to 250 nanometers are prepared via solution casting and thermal annealing steps. Such programmed membranes enable tunable permselectivity for hydrocarbons with less than 40 carbon atoms. The fractionation of kerosene-paraffin mixture in toluene is demonstrated through a two-stage process containing the optimized membranes. The cascade process remarkably enriches the C 10 -C 13 hydrocarbons from 50% up to 97%. The demonstrated polyimide membranes with on-demand molecular discrimination capability provide a potential candidate for the membrane-based hydrocarbon fractionation.
研究领域:
材料科学
·
膜技术
·
化学工程
·
聚合物化学
·
分离科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·Vol. 141
·期 31
·e55721
·
IF 2.7
Tingyu Song,Yonggang Min
A lithium-ion battery separator facilitates lithium-ion transportation and prevents direct contact between the cathode and anode. Polyimide separators exhibited superior thermal stability and electrolyte wettability. In this study, carboxylated polyimide separators were prepared by electrospinning carboxyl group-containing monomers. Polyimide separators were prepared with different content of carboxyl group-containing monomer. Moreover, the thermal property, mechanical property, and electrochemical performance of separators were studied. The carboxylated polyimide separators exhibited lower interfacial resistance and higher ionic conductivity compared with polyimide separators. Moreover, the LiFePO 4 /Li half-cell assembled using the carboxylated polyimide exhibited enhanced cycling stability and rate capability. Therefore, carboxylated polyimide separators with superior electrochemical performances are promising candidates for lithium-ion batteries.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
Gels
·
2024
·Vol. 10
·期 5
·327
·
IF 5
Wanlin Shi,Mengmeng Wan,Yating Tang,Weiwang Chen
Polyimide (PI) aerogels, renowned for their nano-porous structure and exceptional performance across a spectrum of applications, often encounter significant challenges during fabrication, primarily due to severe shrinkage. In this study, we innovatively incorporated ceramic fibers of varying diameters into the PI aerogel matrix to enhance the shape stability against shrinkage. The structure of the resulting ceramic fiber-reinforced PI (CF-PI) aerogel composites as well as their performance in thermal decomposition, thermal insulation, and compression resistance were characterized. The results revealed that the CF-PI aerogel composites dried by supercritical ethanol achieved greatly reduced shrinkage as low as 5.0 vol.% and low thermal conductivity ranging from 31.2 mW·m−1·K−1to 35.3 mW·m−1·K−1, showcasing their excellent performance in shape stability and thermal insulation. These composites also inherited the superior residue-forming ability of ceramic fibers and the robust mechanical attributes of PI, thereby exhibiting enhanced thermal stability and compression resistance. Besides, the effects of different drying conditions on the structure and properties of CF-PI aerogels were also discussed. The coupling use of supercritical ethanol drying with the addition of ceramic fibers is preferred. This preferred condition gives birth to low-shrinkage CF-PI aerogel composites, which also stand out for their integrated advantages include high thermal stability, low thermal conductivity, and high mechanical strength. These advantages attribute to CF-PI aerogel composites substantial potential for a wide range of applications, particularly as high-performance thermal insulation materials for extreme conditions.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）