ACS Omega
·
2022
·
IF 4.132
Song Zuo,Yu Lan,Jinpeng Luo,Fei Zhou,Lexiang Xu,Shaoxiong Xie,Xiuqin Wei,Lang Zhou,Lei Ma,Xiaomin Li,Chuanqiang Yin
Polyimide/boron nitride nanosheet (PI/BNNS) composite films have potential applications in the field of electrical devices due to the superior thermal conductivity and outstanding insulating properties of the boron nitride nanosheet. In this study, the boron nitride nanosheet (BNNS-t) was prepared by the template method using sodium chloride as the template, and B2O3 and flowing ammonia as the boron and nitrogen sources, respectively. Then, the PI/BNNS-t composite films were investigated with different loading of BNNS-t as thermally conductive fillers. The results show that BNNS-t has a high aspect ratio and a uniform lateral dimension, with a large dimension and a thin thickness, and there are a few nanosheets with angular shapes in the as-obtained BNNS-t. The synergistic effect of the above characteristics for BNNS-t is beneficial to constructing the three-dimensional heat conduction network of the PI/BNNS-t composite films, which can significantly improve the out-of-plane thermal conduction properties. And then, the out-of-plane thermal conductivity of the PI/BNNS-t composite film achieves 0.67 W m–1 K–1 at 40% loading, which is nearly 3.5 times that of the PI film.
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2019
·Vol. 30
·期 15
·14391-14404
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IF 2.195
Yu Xuemin,Wang Junchuan,Sun Ying,Zhang Xueqin,Lin Baoping
A series of nanocomposite films loaded with various concentrations of fillers were successfully synthesized by solution casting method (BSCTZS nanoparticles (NPs) as filler and polyimide (PI) as polymer matrix). To improve the dispersion and the physical–chemical properties of (Ba 0.87 Sr 0.04 Ca 0.09 )(Ti 0.86 Zr 0.08 Sn 0.06 )O 3 (BSCTZS) NPs surface, BSCTZS NPs were modified by Al 2 O 3 coating and modified Al 2 O 3 @Nb-BSCTZS NPs/PI nanocomposite films were prepared. The prepared modified Al 2 O 3 @Nb-BSCTZS NPs were characterized by X-ray diffraction (XRD) analysis, and scanning electron microscopy (SEM), and the dielectric properties of these composites were characterized in details. As a result, the nanocomposite films filled with 5 vol% Al 2 O 3 @0.4mol%Nb-BSCTZS nanoparticles exhibit an excellent energy density of 2.11 J cm −3 at 298 kV/mm, which is 48% over the original pristine PI (1.42 J cm −3 at 313 kV/mm). This work can provide a prospective solution for the preparation of composite film materials with high dielectric constant and high energy density.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Libo Yang,Hao Fu,Lei Dong,Mingyue Ma,Yuxiang Deng,Hanyu Wu,Yuezhou Wei,Shunyan Ning,Xinpeng Wang
The effective capture of radioiodine vapor is of paramount importance in mitigating environmental radiation risks associated with spent fuel reprocessing, as well as for thyroid diagnosis and treatment. However, adsorbents used for iodine vapor capture are susceptible to the adverse effects of water vapor, leading to significant reductions in adsorption efficiency. This study presents the design and synthesis of polyimide (PI) aerogels integrated with in situ-grown SnS 2 through a hydrothermal approach. The shape of SnS 2 /PI aerogels can be adjusted via mold manipulation, while also possessing desirable mechanical strength. The SnS 2 /PI-2 aerogel exhibits a remarkable maximum adsorption capacity of 1167 mg/g in a dry environment, with only a marginal 12.4 % decrease observed in a high-humidity environment (74 % relative humidity, R.H.), as assessed by batch experiments. During application in the fixed-bed column, the SnS 2 /PI-2 aerogel demonstrates a significant adsorption capacity of 1070 mg/g at 75 °C. Monitoring conducted for 7 consecutive days post-adsorption confirms the absence of iodine release. This is attributed to the reduction of captured I 2 by the SnS 2 /PI-2 aerogel, forming the stable crystal SnI 4 , thereby preventing its release. Therefore, the SnS 2 /PI-2 aerogels exhibit excellent humidity resistance, thermal stability, and mechanical properties, rendering them highly suitable for capturing radioiodine vapor under complex conditions. This work offers insights into developing efficient aerogel adsorbents for treating radioactive iodine exhaust gases with high humidity in fixed-bed columns or decay tanks.
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高影响因子
Nanoscale
·
2021
·Vol. 14
·期 3
·700-714
·
IF 7.79
Zhiyu Zhou,Zexiang Chen,Yang Zhao,Huifang Lv,Hualiang Wei,Bingbing Chen,Zengjie Gu,Yan Wang
In recent years and following the progress made in lithium-ion battery technology, substantial efforts have been devoted to developing practical lithium–sulfur (Li–S) batteries for next-generation commercial energy storage devices. The practical application of Li–S batteries is still limited by dramatically reduced capacities, cycling instabilities, and safety issues arising from flammable components. In this study, we designed and fabricated a flame-retardant, multifunctional interlayer which integrated electroconductive networks, lithium polysulfide (LiPS) traps and catalysts to significantly elevate the electrochemical performance and safety of pristine Li–S batteries. The LiPS adsorptive polymer polyimide (PI) constrains polysulfides to the cathode region and effectively suppresses the shuttle effect. Coralloid PI/multiwalled carbon nanotube (MCNT) compounds provide plentiful reaction sites for active materials. The catalytic Ni on the metal skeleton surface notably promotes Li+ diffusion, lowers the redox overpotential and accelerates LiPS conversion, which improves the redox kinetics associated with sulfur-related species and significantly elevates sulfur utilization. At different current densities of 0.2 C and 0.5 C, impressive initial discharge capacities of 1275.3 mA h g−1 and 1190.9 mA h g−1 are attainable respectively, with high capacity retentions of 80.3% and 78.6% over 600 cycles. Besides, the multifunctional interlayer can also act as a flame-retardant layer to promote the safety of Li–S batteries by inhibiting the spread of fire. This study provides a feasible and prospective strategy that adopts a multifunctional interlayer to develop Li–S batteries with higher capacities, longer cycling lives and safer working conditions.
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高影响因子
Journal of Materials Chemistry A
·
2021
·Vol. 9
·期 43
·24704-24711
·
IF 12.732
Jinchao Li,Wenjie Xu,Wenheng Huang,Jun Long,Jun Liu,Huan Luo,Yaping Zhang,Liangyin Chu
The performance of vanadium redox flow batteries (VRFBs) is largely determined by the membrane as a separator. To address the trade-off issue between the proton conductance and vanadium resistance of sulfonated polyimide (SPI) membranes, novel covalent cross-linked polyfluoro sulfonated polyimide (PFSPI-PAA-X) membranes are developed by designing and synthesizing polyfluoro non-sulfonated diamine and adopting hydrophilic polyacrylic acid (PAA) as the cross-linking agent. The structures, morphology and physico-chemical properties of PFSPI-PAA-X membranes are systematically investigated. PFSPI-PAA-X membranes possess improved chemical stabilities in contrast to the pure PFSPI membrane. Among all PFSPI-PAA-X membranes, the PFSPI-PAA-25 membrane (0.15 Ω cm2) shows the lowest area resistance, which is even a little lower than that of the Nafion 212 membrane (0.16 Ω cm2). And, the PFSPI-PAA-25 membrane also has an extremely low vanadium permeability of 5.90 × 10−9 cm2 min−1, which is two orders of magnitude lower than that of the Nafion 212 membrane (7.53 × 10−7 cm2 min−1). The VRFB performances including the self-discharge time (PFSPI-PAA-25: 52.3 h, Nafion 212: 17.6 h), efficiencies at 60–300 mA cm−2 (PFSPI-PAA-25: CE = 97.3–99.9% and EE = 90.7–73.6%, Nafion 212: CE = 90.9–96.5% and EE = 84.7–72.0%) and peak power density (PFSPI-PAA-25: 451.4 mW cm−2, Nafion 212: 427.9 mW cm−2) of the PFSPI-PAA-25 membrane are all superior to those of the Nafion 212 membrane. Meanwhile, the PFSPI-PAA-25 membrane shows outstanding durability during the 500 times charge–discharge cycle test. Therefore, the as-prepared PFSPI-PAA-25 membrane with excellent cost-performance ratio has a bright future in replacing the Nafion 212 membrane for application in VRFBs.
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高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2025
·
IF 3.9
Xianzhe Sheng,Shuhuan Yun,Xing Miao,Zhenyu Xiong,Weiran Tang,Xuetao Shi,Jianbin Qin,Zhonglei Ma,Yongsheng Zhao,Guangcheng Zhang
High-performance polyimide foams combining exceptional heat resistance with robust mechanical properties are increasingly in demand in lightweight applications requiring thermal stability, insulation, and flame retardancy. Herein, we present a scalable fabrication strategy for thermally stable and compression strength robust co-cross-linked acetylene-terminated polyimide rigid foams (PIRFs) through the foaming of acetylene-end-capped precursor powders using a norbornene-terminated cross-linking blowing agent (NE-CBA). A series of acetylene-terminated polyimide oligomers (AE-PIO) with controlled molecular weights were synthesized and subsequently melt-copolymerized with an m-phenylenediamine-derived cross-linking blowing agent (NE-CBA-MPD) to establish high-density co-cross-linked networks. The polyimide rigid foams (PIRFs) synthesized from acetylene-terminated precursor powders (Mn = 2264 g/mol) demonstrate exceptional multifunctional characteristics. Specifically, these materials exhibit remarkable thermal stability evidenced by a glass transition temperature (Tg) of 415.1 °C and 10% weight loss temperature (T10%) at 572.0 °C. The mechanical performance remains robust across temperature regimes, with compressive strengths of 2.72 MPa at ambient conditions and 2.58 MPa under thermal stress at 200 °C, achieved at a low density of 140 kg/m3. Furthermore, the foams display superior insulation capabilities, maintaining ultralow thermal conductivity values (λ < 0.035 W/m·K) throughout the 25–200 °C range. Notably, the material achieves Class A fire resistance standards with a limiting oxygen index (LOI) exceeding 45%, demonstrating exceptional flame retardancy. These co-cross-linked PIRFs achieved an optimal balance between structural integrity and foam expansion, showing significant potential as advanced structural materials for extreme environments in aerospace engineering, naval architecture, rail transportation, and other specialized high-temperature applications.
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高影响因子
ACS Sustainable Chemistry & Engineering
·
2025
·
IF 7.3
Changqi Wang,Yongjun Kang,Bingxue Liu,Daolei Lin,Guofeng Tian,Shengli Qi,Dezhen Wu
Polyimide (PI) is a promising binder material for lithium-ion batteries due to its excellent mechanical strength, high thermal stability, and outstanding chemical inertness. However, the high-temperature imidization requirement (>300 °C) of traditional PI binders is incompatible with current electrode preparation processes, severely limiting their practical applications. In this study, a low-temperature-imidized polyimide (∼150 °C) was elaborately designed and utilized as NCM811 cathode binder, which works by covalently bonding 5-aminobenzimidazole (ABZ) to the ends of the flexible 4,4′-oxidiphthalic anhydride (ODPA)/4,4′-oxidiphenylamine (ODA) poly(amic acid) (PAA) chains to realize the self-catalysis at a low temperature, followed by the assistance of dual-functional N,N′-carbonyldiimidazole (CDI) as a catalyst and dehydrating agent to accelerate the condensation and low-temperature dehydration of amic acid, yielding the imidization of the PAA precursor to give PI at 150 °C. Compared to the conventional PVDF binder, the cathode utilizing this low-temperature imidized polyimide (LTPI) binder exhibited excellent capacity retention (84.9% vs 81.7%) after 100 cycles at 0.2C, and superior rate performance (119.3 mAh·g–1 vs 95.7 mAh·g–1 at 5.0C) under a 4.3 V cutoff voltage. The CV, SEM, XRD, and XPS results demonstrate that the designed LTPI binder effectively suppresses the hexagonal (H2) to hexagonal (H3) phase transition and transition metal dissolution, maintaining the cathode’s structural integrity during charge–discharge cycles, thereby ensuring excellent long-term cycle stability. Furthermore, the NCM811 cathode with LTPI binder exhibits significantly enhanced flame-retardant performance compared with the NCM811/PVDF cathode in the combustion experiments, demonstrating the superiority of LTPI binders in improving the safety of the cathode materials. The NCM811/LTPI cathode retains the excellent structural and electrochemical stability of traditional high-temperature-imidized PI binders, providing a practical pathway to develop high-performance binder materials for high-safety and long-cycling lithium-ion batteries.
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高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2026
·
IF 19.9
Mingwei Cai,Fuhui Liang,Huahui Liang,Congcong Wu,Luxin Sun,Xiaohua Ma,Shiyang Zhang,Yonggang Min
Achieving precise customization and structural regulation of sub-Ångström pores of Carbon molecular sieve membranes (CMSMs) remains challenging. In this study, CMSMs with ultra-high H 2 /CH 4 separation performance were developed by a UV induced super-crosslinking network polyimide precursor, which was formed by click reaction through an imide intermediate that contains C≡CH and the SH as functional end groups. The as-formed polyimide contains C═C─S in each repeat unit of the polyimide which can be crosslinked using UV light via the [2+2] reaction and form molecular “stitches” with a super-crosslinking network. The cross-linking node density can be easily adjusted by the UV irradiation time (0–30 min). During pyrolysis, the dimensions of the connecting interior pore necks for sub-Ångström pores can be fine-tuned (4.0±0.3 Å), promoting the formation of a higher concentrated (4%–8%) sub-4 Å pores. The optimized CMS-30 membrane demonstrates outstanding gas separation performance, with H 2 permeability of 2930 Barrer and remarkable selectivity for H 2 /CH 4 (4651), surpassing the Robeson upper bounds and outperforming most reported CMSMs. This photo-induced super-crosslinking network precursor method provides a versatile strategy for high-performance CMSM by sub-nanometer precision engineering of CMSMs.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 12.5
Runyue Li,Daolei Lin,Zheng Zhao,Guofeng Tian,Shengli Qi,Dezhen Wu
Addressing the structural shrinkage during high-temperature imidization (>300 °C) of polyimide (PI) aerogels is a critical challenge for enhancing their thermal insulation and electromagnetic wave-transparent performance in aerospace applications. Herein, a thiazine/imidazole in-situ co-catalyzed low-temperature imidization strategy is developed for the first time, by which PI aerogel with nearly “zero” shrinkage is successfully prepared. This method works by introducing 2,4-diamino-6-[2-(2-methyl-1-imidazolyl) ethyl]-1,3,5-triazine (2MZ-AZINE), whose dual amino groups not only construct a crosslinked network with polyamic acid chains but also precisely anchor catalytic groups onto the side chains, thereby enabling highly efficient low-temperature cyclization. Experimental results indicate that cyclization temperature is reduced from conventionally over 300 °C to 200 °C, consequently reducing shrinkage of PI aerogel significantly from 30.6% to 3.1%. Correspondingly, the 2MZ-AZINE-PI aerogel achieves low density (4.74 mg cm −3 ), super-hydrophobicity (152.7° water contact angle) and low thermal conductivity (25.3 mW m −1 K −1 ). Thermal insulation tests show that the 2 cm-thick 2MZ-AZINE-PI controls the surface temperature to be less than 62.3 °C after 20 min on a 200 °C hot stage (versus 72.8 °C for common PI aerogel), demonstrating superior thermal protection. Moreover, 2MZ-AZINE-PI exhibits record-low dielectric constant in the X-band (8–12 GHz), remarkably close to that of air, with permittivity of 1.004 and loss tangent of 8 × 10 −4 , confirming its exceptional electromagnetic wave-transparent properties. This work establishes a practically useful new paradigm for designing integrated thermal protection/electromagnetic wave-transparent PI aerogel materials for potential aerospace applications.
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高影响因子
ACS Applied Materials & Interfaces
·
2026
·
IF 7.8
Jia Chen,Xianbo Hou,Xinming Huang,Maoqi Xiong,Rongzhu Xia,Xuelei Fang,Liming Chen
Polyimide (PI) aerogels represent a class of organic aerogels endowed with exceptional integrated mechanical and thermal properties. Despite their substantial promise as structural components for mechanical-thermal-coupled protective applications, PI aerogels suffer from a stiffness mismatch with other rigid skins when integrated into structural assemblies. This study fabricates density-graded PI aerogels with positive gradient (PG) and negative gradient (NG) configurations. The mechanical and thermal properties of the aerogels under quasi-static compression (0.001–1 s–1) and low-velocity impact (100 s–1) were investigated. Results demonstrate that gradient PI aerogels exhibit strain-rate insensitivity, which is in sharp contrast to the pronounced strain-rate dependence of homogeneous PI aerogels. PG configurations achieve a superior energy absorption performance over NG counterparts via ordered layer-by-layer collapse with the volumetric energy absorption up to 3.46 MJ·m–3 and gravimetric energy absorption up to 19.80 J·g–1. In addition, the high-density regions of gradient PI aerogels retain excellent thermal insulation performance after impact. This study elucidates the critical role of density gradient direction and layer configuration in regulating the mechanical and thermal performances of PI aerogels. The findings provide mechanistic insights for the rational design of gradient PI aerogel-based protective structures requiring balanced lightweight, energy absorption, and thermal insulation under static and dynamic loading conditions.
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高影响因子
COMPOSITES SCIENCE AND TECHNOLOGY
·
2025
·
IF 9.8
Xue Shen,Xiong Li,Xiaohui Yang,Qiong Li,Nan Wang,Na Song,Tongle Xu,Peng Ding
Lightweight and mechanically strong multifunctional polymer composites with low-reflection electromagnetic interference (EMI) shielding and infrared stealth capacity are urgently needed to protect emerging electronic technologies in aerospace and military equipment. In this work, the polyimide nanocomposites composed of graphene nanosheets/Fe 3 O 4 modified three-dimensional (3D) asymmetric conductive network were developed via in-situ growth and co-carbonization strategy using hierarchical modular design. Owing to the construction of 3D asymmetric conductive network, along with spatial coupling between the magnetic/dielectric synergistic loss, the resulting composites exhibit low mass density of 1.09 g/cm 3 , excellent EMI shielding effectiveness of 54.7 dB, and high absorption coefficient of 0.72, as well as outstanding heat-resistant mechanical properties with an improved tensile strength of 31.1 MPa and reliable infrared stealth performance. Moreover, by virtue of the multiple reflection and absorption shielding mechanism triggered by the 3D asymmetric conduction network and the synergistic effect of thermal regulation, remarkable electromagnetic wave absorption and thermal infrared stealth dual capabilities have been attained. The lightweight, mechanically strong, and absorption-dominated carbon-based polyimide electromagnetic shielding composite holds great promise for emerging applications in EMI shielding and infrared stealth in aerospace and military equipment.
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高影响因子
COMPOSITES SCIENCE AND TECHNOLOGY
·
2021
·
IF 8.528
Huanyu Chen,Gaohui Sun,Zailin Yang,Ting Wang,Guofeng Bai,Jun Wang,Rongrong Chen,Shihui Han
For the advantages of light weight, rapid recovery, and high sensitivity, the conductive flexible composite sponges with idiographic spatial structure as a stress sensor has received great attention. However, for small pressure and deformation, it is still challenging to achieve high sensitivity and response. Here, the polyimide (PI) sponge with through-hole structure and special functional groups is successfully fabricated through a clever structural design and is used as substrate of the composite sponges. The new PI sponge effectively induces the fabrication of reduced graphene oxide (RGO) sponge that possessing a pleated stacked structure in the cells only by a hydrothermal route. By controlling the GO dispersion concentration, the maximum electrical conductivity of the composite sponges reaches to 10.68 × 10 −4 S/m. The maximum sensitivity of composite sponges arrives at 1.172 kPa −1 and possesses a wide response range from 0 to 1 kPa. Comparing with previous similar works, the maximum sensitivity is improved by 74.9–1231.8%. Meanwhile, composite sponges exhibit excellent cycling stability under different compression rates, and present obvious response to tiny stress or deformation which is as low as 0.09 N and 0.45%. This is of great significance for the application of the conductive composite sponges sensor in tiny stress.
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高影响因子
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