JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2016
·Vol. 28
·期 5
·4088-4094
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IF 1.798
Mao Xin,Guo Wenfeng,Li Chengzhang,Yang Jie,Du Lirong,Tang Xianzhong
All-organic polyimide (PI)/poly(vinylidene fluoride) (PVDF) composite materials with high dielectric constant and low dielectric loss were fabricated via solution blending. The dielectric, mechanical, and thermal properties of the PI/PVDF composite films were studied. Results indicated that the dielectric properties of the composites were highly reinforced through the introduction of PVDF, and the composites exhibited excellent thermal stability. When the mass fraction of PVDF was adjusted to 30 wt%, the specimen demonstrated excellent thermal properties, superior mechanical properties, high dielectric constant (5.7, 1 kHz), and low dielectric loss (0.009, 1 kHz). Moreover, the dependence of the dielectric constant and dielectric loss on frequency was investigated. The composite presented stable dielectric constant and dielectric loss that were less than 0.04 within the testing frequency range of 100 Hz–10 MHz. This study demonstrated that the PI/PVDF composites were potential dielectric materials in the field of electronics.
研究领域:
材料科学
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电子工程
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DOI
高影响因子
Colloid and Interface Science Communications
·
2026
·
IF 6.7
Liukui Zhu,Zunqing Liu,Yinggang Liu,Liang Song,Ping Zheng,Wei Chen,Lianxia Ma
Highly transparent and hydrophobic polyimide (PI) films are attractive for advanced optoelectronic and flexible electronic devices, but their performance is often limited by weak organic–inorganic interactions and nanoparticle aggregation. In this work, a chain-end-mediated interfacial design was developed by combining IPTS-mediated PI/SiO 2 coupling with subsequent PFOTES surface fluorination. This sequential interface/surface regulation provided a practical route to jointly improve transparency, hydrophobicity, and thermo-mechanical performance in PI nanocomposite films. The optimized PI-Z2F film exhibited a transmittance at 500 nm (T₅₀₀) of 90.6%, a water contact angle of 114°, a glass-transition temperature (Tg) of 326 °C, and a tensile strength of 165 MPa. These results indicate that coordinated interfacial construction and surface fluorination provide an effective route to balancing hydrophobicity, optical transparency, and thermo-mechanical performance in PI nanocomposite films.
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Materials Today Communications
·
2025
·
IF 4.5
Siyu Yan,Yuwei Cheng,Lei Li,Xiangpei Qin,Hao Xiong,Xinlei Gao,Li Wu
Concern for the environment is one of the main factors that are increasing the demand for superlubricity materials, this study aims to evaluate the lubrication performance of nano-silica modified PI and coating of polyetheretherketone (PI (NS)-PEEK) superlubricity material during the plane-plane contact process. A series of PI-PEEK materials modified by silica nanoparticles with different concentrations (0.05, 0.1, and 0.5 wt%) were synthesized and characterized by transmission electron microscopy (TEM), scanning electron microscope (SEM), white light interferometer, field emission scanning electron microscope (FESEM) and energy dispersive spectrometer (EDS). Friction tests were conducted under a load of 5 N for three hours to determine the optimal concentration based on anti-frictional properties. The PI-PEEK optimized with a 0.1 wt% concentration of SiO 2 further applied in the friction test at different velocities and different loads. Suggesting its potential as a superlubricity material. The results indicated superior antifriction performance at a NS concentration of 0.1 wt%, leading to the minimal average friction coefficients of 0.001221 (load of 5 N, velocity of 200 rpm), maintain superlubricity (ACOF=0.007528) under high loads (load of 95 N, velocity of 200 rpm), and maintain superlubricity (ACOF=0.007528) under high velocities (load of 5 N, velocity of 400 rpm). Additionally, the use of the nano-silica contributed to the formation of transfer film. SEM and white light interferometer characterization outcomes demonstrated that the worn surface of PI (NS)-PEEK exhibited a greater propensity to generate a smooth and continuous transfer film, compared to samples with a nano-free PI-PEEK. The EDS characterization results manifested that the transfer film consisted of three elements, viz. carbon (C), oxygen (O), and silicon (Si). These findings suggest that PI (NS)-PEEK could serve as an effective alternative to conventional bearing in future industrial bearing applications.
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Materials Research Express
·
2019
·Vol. 6
·期 10
·105316
·
IF 1.449
Ruoyu Liu,Chuanbing Huang,Lingzhong Du,Hao Lan,Shige Fang,Weigang Zhang
Aluminium/polyimide (Al/PI) powders were prepared via in situ. Al/PI composites were fabricated by hot pressing technology at 723 K for 30 min under Ar. The microstructure, thermal stability and tribological properties of Al/PI composites were investigated. SEM images showed that Al particles were wrapped in the composite with no gap. According to the TG analysis, 15Al/PI composite showed excellent thermal stability up to 773 K. Meanwhile, 15Al/PI composites exhibited excellent tribological behaviour at high temperature, especially at 773 K. The friction coefficient of 15Al/PI composite at 773 K was about 0.28 which was lower than that of pure PI (about 0.41). The wear rate of 15Al/PI composite at 773 K was about 65 × 10−5 mm3 Nm−1. The tribological properties of Al/PI composites was improved at high temperature. In the process of sliding tests, Al particles were transferred to the Ti-6Al-4V alloy's surface and PI particles were pressed on the composite's surface. The transfer of Al can protect Ti-6Al-4V alloy from wear and reduce the friction coefficient during the sliding test.
研究领域:
材料科学
·
摩擦学
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DOI
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NANO
·
2018
·
IF 1.1
Yonghong Peng,Shuai Zhang,Fanghua Zhu,Wa Li,Yong Yi,Kai Du,Qiang Yin
There is a demand for composite films with excellent hydrophobic properties in inertial confinement fusion (ICF) physics experiments. In this paper, we prepared fluorinated polyimide hydrophobic films using spinning and plasma etching methods. The experimental results indicate that the water contact angle for the perfluorodecyltrichlorosilane (PFTS) treatment polyimide (PI) film is 112.0 ∘ , which is larger than the pure PI film ( 6 9 . 0 ∘ ) . The rap oil contact angle is 84.2 ∘ , which is also much larger than the contact angle of PI film ( 1 2 . 0 ∘ ) . Moreover, the surface roughness of the prepared films was measured by white light interferometry (WLI). The surface roughness (Ra) of pure PI is 9.79 nm, but with the application of FSiO 2 particles, the Ra of the films increases to 65.05 nm. After plasma treatment, the Ra of the PI/FSiO 2 composite film increases to 186.71 nm because plasma treatment can scratch the film surface and increase its roughness. However, treating the PI/FSiO 2 composite film with the plasma and PFTS, the Ra is only 88.90 nm. This decrease in Ra is due to the PFTS, which is able to reduce the surface roughness. The development of composite films, compared to pure PI films, could prove to be an extremely valuable material in ICF experiments.
研究领域:
材料科学
·
物理学
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JOURNAL OF ELECTRONIC MATERIALS
·
2022
·Vol. 51
·期 9
·4986-4994
·
IF 2.047
Cao Zhangyi,Xie Xi,Chen Xin,Yu Jiaqi,Liu Xiukun,Huang Yuanxing,Xu Xu,Lu Shaorong,Li Yuqi
The high wear and temperature resistance of electrode materials are the key issues to extend the application of triboelectric nanogenerators (TENG). The synergistic effect of Fe 3 O 4 and ionic liquid-modified graphene (IGNs) were used to enhance the wear resistance, heat resistance, and mechanical properties of polyimide (PI). Then, the output performance of the PI-based TENG in contact–separation mode was tested. The results show that the tensile strength and thermal decomposition temperature of the IGNs/Fe 3 O 4 /PI composites (2F2G) d increased by 57 MPa and 23°C, respectively, due to the synergistic effect of IGNs and Fe 3 O 4 . In addition, the friction coefficient and wear rate of the 2F2G decreased by 21% and 14%, respectively. The open-circuit voltage, short-circuit current, and peak power density of the 2F2G-based TENG were 65 V, 2.48 μA, and 1.34 W/m 2 at 1 Hz, respectively. Owing to the high wear and temperature resistance of the 2F2G, the 2F2G-based TENG has a broad application prospect in the fields of wear- or high-temperature-resistant energy harvesting and self-powered sensors. Graphical Abstract
研究领域:
材料科学
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能源技术
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纳米科技
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DOI
高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
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2023
·
IF 8.7
Xiang Li,Taijun He,Qian Yin,Yitian Qin,Siyuan Sun,Jie Yang,Peng Wang,Kun Fan,Xiangyang Liu
Polyimide (PI) films with excellent corona-resistant performance are vital in multitudinous electrical equipment. Here we employ a largely unexplored strategy to effectively restrain phase separation behavior of siloxane modified PI through chain extension copolymerization (PI-e-Si), thereby generating dense SiO 2 -like storage space under corona that shows powerful ability of encircling and restraining electron/ion, which restricts their direct and persistent attack for PI segment. Therefore, PI-e-Si film owns obviously longer corona-resistant lifetime (30.8 min) than that of pristine PI film (6.4 min) based on accelerated corona-aged test. Furthermore, fluorinated Al 2 O 3 (F-Al 2 O 3 ) with strong corona-resistant ability is applied to construct a solid barrier for dense SiO 2 -like storage space, which synergistically strengthens restraint effect for electron/ion, and it also optimizes heat-conducting and dielectric properties of PI film. Finally, fabricated composite film (PI-e-Si/F-Al 2 O 3 ) further improves corona-resistant lifetime up to 66.8 min, superior to that of Kapton 100 CR film (a famous corona-resistant PI film).
研究领域:
材料科学
·
电气工程
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DOI
高影响因子
FITOTERAPIA
·
2024
·
IF 2.5
Li Wang,Yi-Xiao Chen,Xin-Jing Meng,Hai-Yang Liang,Ya-Dan Zhang,Hui-Hui Zhou,Yu-Hang Liu,Xiao-Yu Chen,Zhen-Hua Liu,Shi-Ming Li,Wen-Yi Kang
Patrinia punctiflora is a medical and edible Chinese herb with high nutritional and medicinal value. The continuing study of its chemical constituents led to the isolation of six iridoids, which were previously unreported compounds, patriscabioins P U ( 1–6 ). Their structures were characterized and confirmed with NMR (1D & 2D), HRMS, IR and UV. Among them, compound 5 was screened to evaluate its insulin resistance activity on an IR-HepG-2 cell model. Compound 5 had no cytotoxicity compared with the control group and could promote glucose uptake in IR-HepG-2 cells. Through further mechanism studies, the undescribed compound 5 could increase the expression levels of PI-3 K, p -AKT, GLUT4 and p -GSK3 β proteins. Moreover, the expression of PEPCK and G6Pase proteins, which are key gluconeogenic enzymes, was also inhibited. Thus, compound 5 promotes the transfer of GLUT4 to the plasma membrane by activating the PI-3 K/AKT signaling pathway, at the same time, promotes glycogen synthesis and inhibits the onset of gluconeogenesis, which in turn ameliorates insulin resistance.
研究领域:
药理学
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细胞生物学
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分子生物学
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DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
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2024
·
IF 8.3
Azim Abdullaev,Xiangyu Mei,Fujian Liu,Kun Peng,Yujie You,Feiyan Wu,MD Zahidul Islam,Qingbiao Yang,Yinsong Si,Yaqin Fu
High-frequency, high-power, and high-speed telecommunication in a complex environment promotes the development of dielectric materials toward a low dielectric constant, low dielectric loss, good thermal properties, and long-term reliability. Here, polyimide/polytetrafluoroethylene (PI/PTFE) nanofiber membranes with an inherent super hydrophobicity, excellent dielectric properties, good thermal stability, and enhanced tensile strength were prepared via a simple electrospinning strategy and an imidization reaction. The obtained PI/PTFE membranes demonstrate a superlow average dielectric constant of 1.22–1.27 and a dielectric loss of 0.032–0.048 in high frequency, together with an enhanced tensile strength, benefiting from the special nanofiber-bead structure formed in the composite membrane. The mixing of polyamic acid (PAA) and PTFE in the electrospinning solution endows the obtained PI/PTFE nanofiber membrane with a uniform distribution of PTFE and thus an inherent superhydrophobicity with a water contact angle of 156.1 and 159.2° for PI/PTFE-30% and PI/PTFE-40%, respectively. Besides, the hydrophobicity could be kept even after standing more than 10,000 water drops, and the thermal properties exhibited promising results with Tmax = 587 °C and Td5% = 423 °C, rendering these PI/PTFE membranes favorable alternatives for prospective telecommunication.
研究领域:
材料科学
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电信工程
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产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 12.5
Huanjian Yu,Yuanming Zhang,Haoxi Ben,Xiaoling Wang,Cunzhi Zhang,Yuanyuan Zhang,Wei Jiang,Xiaojun Wang
Construct PI-encapsulated core-shell aerogel fibers to enhance mechanical robustness. • Achieve 29.4 MPa strength and 12.0 MJ·m −3 toughness in porous fibers. • Enable lightweight textiles with low thermal conductivity and flame retardancy. Bio-based aerogel fibers with ultrahigh porosity and low thermal conductivity are attractive candidates for sustainable thermal insulation textiles. However, their practical application is greatly limited by insufficient mechanical robustness. Here, we report a structurally engineered reinforcement strategy to fabricate mechanically robust aerogel fibers featuring a bacterial nanocellulose (BNC)/sodium alginate (SA) composite core encapsulated within a rigid polyimide (PI) shell. The treatment involves the formation of intertwined BNC aerogel frameworks (aerogel core) and the chemical imidization of poly(amic acid) (PAA) to form a robust PI shell. This design preserves the high porosity of the core while imparting exceptional mechanical robustness. The optimized P10t2.5 fibers exhibit a high tensile strength of 29.4 MPa, a high toughness of 12.0 MJ·m −3 , and excellent flame retardancy with an LOI of 33.5%. Textiles woven from P10t2.5 fibers exhibit an ultralow thermal conductivity of 0.033 W·m −1 ·K −1 . This work provides a viable route toward mechanically robust, thermally insulating aerogel textiles for personal thermal management in demanding environments.
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IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION
·
2026
·
IF 3.3
Yuye Zhang,Yiyi Zhang,Zhicheng Su,Danquan Lan,Wenchang Wei,Junwei Zha
Cellulose-based insulation paper is widely used in high-voltage equipment, but its limited thermal conductivity and dielectric strength restrict reliable performance under elevated temperatures and strong electric fields. In this work, a dual-phase composite paper is developed by incorporating nano-ZnO and polyimide (PI) into a cellulose matrix, guided by molecular dynamics (MD) simulations. The combined fillers improve interfacial compatibility, suppress void defects, and establish continuous thermal pathways together with stable insulating barriers. Simulation predictions of enhanced thermal transport, charge suppression, and mechanical reinforcement are verified by experiments. The optimized formulation containing 3 wt% nano-ZnO and 6 wt% PI achieves a thermal conductivity of 0.294 W·m⁻¹·K⁻¹, a tensile strength of 72.12 MPa, corresponding to 87.26% and 41.02% improvements over pure cellulose (P0). Meanwhile, the breakdown strength increases from 60.22 to 73.51 kV·mm⁻¹ (+22.07%), and the relative permittivity and dielectric loss tangent decrease to 2.49 (−40.86%) and 0.46% (−43.21%). These results demonstrate that the dual-filler strategy provides a structurally compact and functionally stable composite architecture, enabling simultaneous enhancement of thermal, mechanical, and dielectric properties. This study confirms the effectiveness of simulation-guided design in accelerating the development of multifunctional cellulose-based insulating materials and highlights their potential for application in next-generation high-voltage power systems.
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Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Kaixuan Sun,Yumin Sun,Huanru Wang,Pu Zhang,Yanyang Wang,Xutong Han,Xiongfei Du,Qinglin Huang
We report a freeze-templated, through-pore PI/PTFE aerogel that integrates a PTFE-impregnated superhydrophobic interface (water contact angle ≈ 156°) with an open, percolating architecture engineered for hot W/O emulsion separation. Under a modest driving pressure (ΔP = 0.02 MPa), the aerogel delivers high oil fluxes and > 99.5 % separation efficiency across a broad operating window (25–90 °C, pH 1–14). At 90 °C, fluxes exceed 3800 LMH (soybean-oil emulsions) and 1360 LMH (vacuum-pump-oil emulsions) while maintaining ≥ 99.5 % rejection; 30-cycle tests confirm durability with ethanol-rinse regeneration and minimal performance drift. The aerogel’s low thermal conductivity (≈ 0.048–0.074 W·m −1 ·K −1 ) additionally mitigates heat loss during hot-emulsion processing. These results demonstrate a scalable route to high-throughput, chemically and thermally robust W/O emulsion remediation.
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