HIGH PERFORMANCE POLYMERS
·
2024
·
IF 1.8
Guohao Zhu,Jilei Xu,Huimin Sun,Ping Chen
A novel phenylethynyl-terminated siloxane-containing ortho-hydroxy polyimide (O-SPI) was synthesized and physically blended with thermoplastic polyimide (PI) to enhance both the thermal and mechanical properties of polyimide, addressing the growing demand for high-performance materials in harsh environments. The blend underwent conversion to semi-Interpenetrating Polymer Networks (semi-IPNs) and benzoxazole structures through thermal curing of reactive phenylethynyl groups and thermal rearrangement of ortho-hydroxy imide units. The trends in thermal and mechanical properties were investigated in relation to the chemical structures and varying mass fraction of O-SPI. The covalent incorporation of semi-IPNs and rigid benzoxazole structures restrict segmental motion while the backbone linkage confers the toughness of the blends. These synergistic effects insure the cured blends with high glass transition temperatures (472.51°C) and tensile strength (117.81 MPa) simultaneously, demonstrating their potential for applications in challenging conditions.
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高影响因子
Nanomaterials
·
2023
·Vol. 13
·期 6
·1056
·
IF 5.3
Jiaheng Zhou,Chunhao Lu,Danquan Lan,Yiyi Zhang,Yiquan Lin,Lingyu Wan,Wenchang Wei,Yuwang Liang,Dongxin Guo,Yansong Liu,Wenyao Yu
Recently, scientists have been facing major obstacles in terms of improving the performances of dielectric materials for triboelectric nanogenerators. The triboelectric nanogenerator (TENG) is one of the first green energy technologies that can convert random mechanical kinetic energy into electricity. The surface charge density of TENGs is a critical factor speeding up their commercialization, so it is important to explore unique methods to increase the surface charge density. The key to obtaining a high-performance TENG is the preparation of dielectric materials with good mechanical properties, thermal stability and output performance. To solve the problem of the low output performance of PI-based triboelectric nanogenerators, we modified PI films by introducing nanomaterials and designed a new type of sandwich-shaped nanocomposite film. Herein, we used polyimide (PI) with ideal mechanical properties, excellent heat resistance and flexibility as the dielectric material, prepared an A-B-A sandwich structure with PI in the outer layer and modified a copper calcium titanate/polyimide (CCTO/PI) storage layer in the middle to improve the output of a TENG electrode. The doping amount of the CCTO was tailored. The results showed that at 8 wt% CCTO content, the electrical output performance was the highest, and the open-circuit voltage of CCTO/PI was 42 V. In the TENG, the open-circuit voltage, short-circuit current and transfer charge of the prepared sandwich-structured film were increased by 607%, 629% and 672% compared to the TENG with the PI thin film, respectively. This study presents a novel strategy of optimizing dielectric materials for triboelectric nano-generators and has great potential for the future development of high output-performance TENGs.
研究领域:
纳米技术
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能量收集
·
材料科学
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介电材料
·
绿色能源
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高影响因子
MATERIALS CHEMISTRY AND PHYSICS
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2015
·
IF 2.259
Fei Xu,Jintao Xia,Wei Shi,Shun-an Cao
A sulfonyl-based polyimide has been synthesized and investigated as cathode for lithium and sodium secondary batteries. The lithium cell delivers a flat discharge plateau at 2.5 V with an average discharge voltage of 2.45 V. Increasing the lithium salt concentration can largely enhance the cycling performance. A stable discharge capacities of 120 mAh g −1 is obtained for long-term cycling (450 cycles) with concentrated electrolyte. The sodium cell provides two plateaus with an average discharge voltage of 2.0 V. The capacity retention rate of the sodium cell is 70% at 100th cycle (86 mAh g −1 ).
研究领域:
能源材料
·
电化学
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电池技术
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ACS Applied Materials & Interfaces
·
2026
·
IF 8.2
Linxin Yao,Zuyan Liu,Xiaoqiong Wu,Xitao Guo,Zhiming Qiu,Yurong Yan
Escalating requirements for energy density, fast-charging capability, and operational safety in lithium-ion power batteries demand separators with exceptional structural stability and ion-transport efficiency. Herein, a flexible, improved-wettability polyimide membrane derived from a diamine monomer containing cyano groups is synthesized via electrospinning. The interconnected pore structure and high porosity of the cyano-based polyimide separator deliver the desired electrolyte wettability (405%) and thermal stability. Importantly, the introduction of polar cyano groups with a high dielectric constant provides a high anodic oxidation potential. The lithium-ion battery assembled with the cyano-based polyimide separator provides strong coordination with Li+, exhibiting elevated ion conductivity (1.04 mS cm–1, 25 °C) and high-rate performance, delivering a capacity of 98.4% at a rate of 0.5 C after 200 cycles. Moreover, the cyano-based polyimide separator displays great cycling durability and capacity retention (99.5%, 133.6 mAh g–1) even at 100 °C. The above-mentioned properties imply that cyano-containing polyimide nanofibrous membranes are outstanding candidates as separators in the high-capacity lithium-ion battery industry.
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DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 13.2
Hongyang Li,Zelin Guo,Zhan Liu,Changda Nie,Sijia Wang,Menghan Li,Zhonghao Rao
The performance and safety of lithium-ion batteries (LIBs) are highly dependent on the operating temperature. Therefore, it is of utmost importance to establish an efficient and reliable battery thermal management (BTM) system to regulate the battery temperature. Latent heat storage technology, as an efficient passive thermal management solution, has attracted much attention in BTM. However, the commonly used phase change materials (PCMs) have problems such as easy leakage, poor thermal stability, and flammability, which always hinder their practical application. In this study, a polyimide@1-tetradecanol@graphene oxide (PI@TD@GO) composite PCM was synthesized and used for BTM. It not only achieves efficient heat storage and thermal management, but also exhibits a fire alarm function in an extreme thermal situation, providing a new idea for the thermal management of LIBs. In the BTM experiment, the surface temperature of the battery loaded with the PI@TD@GO5 decreases from 80.1 °C to 61.6 °C at a 3C discharge rate. In the fire alarm experiment, the PI@TD@GO5 triggered a fire alarm after 14 s contacting with flame and maintained the alarm for more than 200 s. This research proposes an innovative solution for battery thermal management, flame retardant, and fire alarm, which has great application potential.
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HIGH PERFORMANCE POLYMERS
·
2026
·
IF 1.8
Zhenghui Yang,Shun Shi,Haiquan Guo
The rapid development of flexible displays has spurred the rational design and performance optimization of colorless polyimide films (CPI) with superior integrated properties. In this work, a series of amide-bridged CPI films were fabricated via polycondensation of the as-synthesized dianhydrides (p-DAMDA, m-DAMDA, F-DAMDA) with commercial diamines, including 2,2′-bis(trifluoromethyl)benzidine (TFDB) and trans-1,4-diaminocyclohexane (t-CHDA). The results demonstrated p-DAMDA/TFDB exhibited the most favorable comprehensive performance, featuring a high optical transmittance of 86% at 550 nm, a low CTE value of 8.7 ppm K-1 and a relatively high Tg of 334°C. Besides, the effects of meta-substituted structure and aromatic fluorination on the optical and thermal properties of as-prepared CPI films were systematically investigated. The results showed the aromatic fluorination (i.e., hydrogen atoms substituted by fluorine), effectively enhanced the optical performance while retaining excellent dimensional stability. For instance, the optical transmittance and CTE value of F-DAMDA/t-CHDA film reached 87% and 16 ppm K-1, respectively. By contrast, the introduction of meta-substituted structure disrupted the ordered packing of molecular chains and increased the free volume, thus leading to an elevated CTE and deteriorated thermal dimensional stability, even though a relatively high optical transparency was retained. As a representative example, the m-DAMDA/t-CHDA film showed an optical transmittance of 86% and a CTE value of 35.3 ppm K-1, respectively. This work provided valuable insights into the structure-performance relationship of amide-bridged CPI films, offering a feasible molecular design strategy for advanced flexible electronic applications.
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高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2026
·
IF 9.2
Jiale Zhao,Lingwei Li,Yijiao Zhang,Yao Wang,Bihai Su,Feibo Li,Xiaojing Wang,Linlin Shi,Xiaohong Gao,Zhixiao Zhang,Xiaoliang Zhang,Jingbo Mu,Yu Dong,Yanming Wang
This study presents a novel strategy for developing high-performance proton exchange membranes (PEMs) by innovatively integrating sulfonated halloysite nanotube (SHNT)-loaded polyvinyl alcohol (PVA) nanofibers into a sulfonated polyimide (SPI) matrix. The fabrication process employed electrospinning of SHNT-dispersed PVA solution to produce axially aligned PVA@SHNT nanofibers, which were subsequently homogeneously dispersed in the SPI matrix via solution casting. The resulting composite membranes exhibited notable properties. The optimized SPI-PVA@6SHNT membrane demonstrated significant improvements in mechanical strength and dense, uniform morphology. The synergistic effect of microphase separation induced by PVA nanofibers and the hollow structure of SHNT significantly enhanced water uptake, reaching 71.5%. The composite membrane achieved effective proton conductivity through dual proton transport mechanisms: vehicular transport facilitated by increased water content and hopping conduction through hydrogen-bonded networks among PVA, SHNT and SPI. When assembled into membrane electrode assemblies (MEAs), the SPI-PVA@6SHNT membrane delivered strong fuel cell performance, achieving maximum power densities of 334.1 mW cm −2 at 100% relative humidity (RH) and 301.4 mW cm −2 at 75% RH with H 2 -air atmosphere, demonstrating effective humidity tolerance. This nanofiber-mediated modification strategy offers a promising approach for developing advanced PEMs with balanced proton conductivity, mechanical robustness, and operational stability.
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高影响因子
IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION
·
2026
·
IF 3.3
Dong Yue,Wei Kong,Yu Teng,Yue He,Zhongtang Ji,Yuanhang Yao,Yu Feng,Jie Sheng
When high-energy electron beam irradiation acts on space electrical equipment, the insulating materials undergo structural degradation and performance deterioration with increasing operation time, which compromises the operational safety of the space electrical equipment. In this work, a method of coating the surface of the insulating films with a higher barrier layer is proposed. A boron nitride (BN) layer with micro-nano thickness is in-situ deposited on the surface of the polyimide (PI) insulating film via plasma-enhanced chemical vapor deposition (PECVD), improving insulation performance and resistance to high-energy electron beam irradiation while ensuring strong interfacial bonding. The effects of different high-energy electron beam irradiation doses (1.0×1015-1.0×1016 e/cm2) on the microstructure and dielectric properties of pure PI films and PI-BN composites are investigated. Under high-energy electron beam irradiation, PI-BN composites exhibit no significant damage compared to pure PI films, including a surface roughness that is four times lower than that of pure PI films, and the breakdown strength decreases by only 3.6%. The BN deposition layer can scatter high-energy particles and alleviate insulation damage caused by high-energy electrons because of its higher barrier height and excellent insulation performance. This provides a novel insulating materials microstructure design approach for electrical equipment operating in space radiation environments.
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高影响因子
Sustainable Materials and Technologies
·
2026
·
IF 9.7
Hong Chen,Wei Ou,Hongchang Huang,Junlan Li,Juncheng Liu
Both the 2D titanium carbide (Ti 3 C 2 T x ) MXene and the 3D rare earth doped zirconium-based metal organic framework (Ln 3+ @UiO-66, MOF) were constructed on the colorless transparent polyimide (CPI) film to form the heterojunction multifunctional nano-coating via a one-pot immersion method in order to improve the UV resistance of CPI. Firstly, the S/CPI film was obtained via the CPI being modified with silica (SiO 2 ) sol, and then the Ti 3 C 2 T x MXene was loaded onto the surface of the S/CPI film via the hydrogen bond, finally the Ln 3+ @UiO-66 was loaded onto the ultra-thin Ti 3 C 2 T x MXene nanosheets to obtain optimal sample (MXene/Ln 3+ @UiO-66-S/CPI). The transmittance of MXene/Ln 3+ @UiO-66-S/CPI is 93.33%, which is only 0.94% lower than that of S/CPI. The tensile strength and elongation of MXene/Ln 3+ @UiO-66-S/CPI are basically the same as those of S/CPI. The attenuation values of transmittance, tensile strength, and elongation for MXene/Ln 3+ @UiO-66-S/CPI film after 5000 equivalent sun hours (ESHs) UV irradiation are 2.44%, 10%, and 18%, respectively, i.e., this film gets both a high transparency and a super ultraviolet resistance. This may be attributed to the fact that the MXene/Ln 3+ @UiO-66 multifunctional nano-coating can absorb the UV light and undergo the down-conversion, weakening the UV irradiation intensity.
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高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2026
·
IF 19.9
Fuxing Zhai,Lixin Xu,Huijian Ye
Addressing the issues of accelerated charge migration and diminished energy storage performance in polyimide (PI) under a high-temperature electric field, this study proposes an aggregation-state regulation strategy through the construction of non-conjugated nanodomains in PI-based copolymers. By introducing non-conjugated polydimethylsiloxane (PDMS) diamine into the PI backbone and leveraging the segmental incompatibility between aromatic PI and PDMS segments, a nanoscale “sea-island” phase-separated structure is generated based on the enthalpy-driven phase separation principle. This tailored heterogeneous structure weakens compact aromatic packing, reduces local electronic coupling between PI-derived segments, and suppresses long-range charge migration while simultaneously introducing deep trapping sites at heterogeneous interfaces, thereby synergistically regulating charge diffusion behavior of the PI-PDMS copolymer. The resultant PI-PDMS film exhibits outstanding performance over a wide-temperature range: a dielectric constant of 4.41 with low loss of <0.015 at 100 Hz, a discharged energy density of 16.2 J/cm 3 with efficiency of > 90% at 950 MV/m and 25°C, and 6.6 J/cm 3 with efficiency of > 90% at 600 MV/m and 200°C. This research establishes a fresh paradigm for the design of high-performance polymer dielectrics through aggregation-state regulation.
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高影响因子
Journal of Environmental Chemical Engineering
·
2026
·Vol. 14
·期 5
·123534
·
IF 7.5
Fanshen Meng,Dongliang Zhang,Zihang Zhang,Yu Lin
Traditional oil absorption and oil-water separation methods have significant shortcomings such as low efficiency, high cost and environmentally unfriendly, developing efficient oil absorption and recyclable recovery materials has become more desirable for industrial applications. Herein, we fabricate the anisotropic polyimide (PI)/Ti 3 C 2 T x MXene composite aerogels with highly elastic mechanical performance and outstanding flame retardancy, thermal insulation and oil absorption properties via an unidirectional freeze drying method. The introduction of strong hydrogen bonding interactions between Ti 3 C 2 T x and PI matrix is beneficial to the structure integrity and mechanical properties of the composite aerogels. The samples show excellent mechanical properties along the axial direction and highly elastic properties along the radial direction. The compressive modulus and strength of the T 1 P 4 composite aerogel are 5.16 and 0.55 MPa, respectively, and only the minimal plastic deformation and low energy loss coefficient can be observed for the composite aerogel even after 500 compression cycles. Moreover, the PI/Ti 3 C 2 T x composite aerogels has low thermal conductivity, superior flame retardancy and thermal insulation, and excellent oil absorption properties. The surface temperature is 40.6 °C for the T 2 P 1 composite aerogel with 15 mm thickness after annealing on the hot stage at 180 °C for 5 min. The water contact angle of the T 1 P 4 composite aerogel is 123°, and the oil absorption capacity of lubricant oil is 1126%. Furthermore, the composite aerogel exhibits stable oil absorption capacity even after 50 cycles, which demonstrates great potential for practical applications in cyclic oil absorption.
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高影响因子
POLYMER COMPOSITES
·
2026
·
IF 4.9
Li Diao,Ziyuan Wang,Han Wu,Xin Hao Xu,Linying Xiong,Ya Peng
Core–shell CaCu 3 Ti 4 O 12 @Al 2 O 3 (CCTO@Al 2 O 3 ) fillers were synthesized via a hydrothermal method and subsequently functionalized with KH550 to obtain K-CCTO@Al 2 O 3 . The formation of the core–shell structure was confirmed by transmission electron microscopy (TEM), while the successful grafting of KH550 and the presence of a stable interfacial layer were further verified by FT-IR spectroscopy, X-ray diffraction (XRD), surface energy measurements, and particle size analysis. Polyimide (PI) composites were fabricated through in situ polymerization of 4,4′-(4,4′-isopropylidenediphenoxy)bis(phthalic anhydride) (BPADA) and 4,4′-oxydianiline (ODA), with various loadings of K-CCTO@Al 2 O 3 incorporated into the matrix. The dielectric, mechanical, water resistance, breakdown strength, and thermal properties of the resulting PI composite films were systematically investigated. Among all samples, the composite containing 10 wt% K-CCTO@Al 2 O 3 showed the best overall performance, showing a dielectric constant of 8.93 at 1 kHz before water absorption and 9.10 after water absorption, with dielectric loss remaining below 0.01 under both conditions. In addition, this composite exhibited a tensile strength of 117.41 MPa, a breakdown strength of 246.1 kV/mm, improved thermal stability, and excellent water resistance. The KH550 functionalization renders the filler surface energy closer to that of the PI matrix, thereby enhancing interfacial compatibility and promoting more uniform filler dispersion. Consequently, interfacial defects are effectively suppressed, facilitating more efficient charge transport and stress transfer within the composite. This study demonstrates that combining the core–shell structure with surface functionalization is an effective approach for developing high-performance dielectric polyimide composites. Highlights KH550 was applied to modify core–shell CCTO@Al 2 O 3 fillers. Dielectric composites were prepared from K-CCTO@Al 2 O 3 and polyimide. The KH550 treatment improved the dispersion of K-CCTO@Al 2 O 3 fillers in PI. K-CCTO@Al 2 O 3 improved dielectric and mechanical performance for the optimized loading.
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高影响因子
危险品化学品经营许可证（带存储）