REACTIVE & FUNCTIONAL POLYMERS
·
2026
·
IF 5.4
Chenglu Liang,Zhengyang Li,Tianyu Chen,Qi Wang,Rong Guo,Yang Liu
Polymer binder plays an important role in the fabrication and performances of lithium-ion batteries (LIBs). Developing new binder materials that can meet the requirement of high voltage conditions and higher working temperatures has aroused increasing research interest. In this work, a novel cross-linked polyimide binder (PI-APE-AZ) with high adhesion, high voltage tolerance and high Li ions affinity was designed and synthesized. The peeling forces of the cathodes binding by cross-linked polyimide reached 0.531 N/mm, which was 10 times higher than the commercial PVDF of only 0.051 N/mm. The electrochemical performances of PI-APE-AZ constructed cathodes exhibited much superior performances that the commercial PVDF in terms of thermos stability, cycling performances and rate performances, especially under higher voltages conditions. More intriguing, the Li + transfer in the polyimide binding cathodes was greatly enhanced than the PVDF as indicated by the EIS and kinetics fitting results. This crosslinking strategy was verified by other polyimides constructed by different monomers, indicating the great potential of polyimide binders in LIBs.
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高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Tingting Jia,Hao Chen,Zhen Fan,Huikang Xu,Jinlong Huang,Pengtao Wang,Hao Xing,He Jia,Xupeng Fan,Haoran Zhou,Dezhi Wang,Chunyan Qu,Jean-François Gohy,Changwei Liu
The continuous improvement of papermaking technology has attracted widespread attention. However, the prevention of high-temperature decomposition and a subsequent decline in mechanical strength is still a significant challenge with current papermaking technology. Herein, a newly developed multilayer interconnected polyimide aerogel-based paper was successfully prepared via an anisotropic aerogel hot-extrusion strategy. Precursor solutions of highly rigid benzimidazole units containing intermolecular hydrogen bonds and linear rod-like benzimide units were first prepared. Anisotropic precursor polyimide (PAAS) aerogels with a thickness of 3 mm were then manufactured by unidirectional freeze-drying. Then, aerogel-based papers with a thickness of 40 μm and microstructure multilayer interconnected properties were obtained by a hot extrusion strategy and a thermal imidization process. This polyimide structural paper exhibited excellent thermal and mechanical properties. Through the design of micro and macro structures, the tensile strength of the aerogel-based paper was much higher than that of commercial paper at both room temperature and 400 ℃. This aerogel-based paper also exhibited high-temperature cycle stability, high flexibility, and good stretchable bending properties. The successful preparation of this aerogel-based paper demonstrates the feasibility of the hot extrusion strategy. This work provides a new papermaking technology method and broadens the application field of paper.
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DOI
高影响因子
Energy Technology
·
2022
·Vol. 10
·期 4
·2100982
·
IF 4.149
Liu Kefan,Yang Chengyuan,Li Xiaogang,Dong Nanxi,Liu Bingxue,Tian Guofeng,Qi Shengli,Wu Dezhen
With the continuous development of lithium-ion batteries (LIBs), the electrochemical performance and safety of LIBs have become increasingly challenged recently. Therefore, research on high-performance LIB separators has gradually attracted widespread attention. As an important component of lithium batteries, the diaphragm plays an important role in battery safety. Improving battery separator performance is an important way to improve batteries’ safety and electrochemical performance. Herein, to prepare a new type of LIB separator, a preparation strategy in which polyimide (PI) nanofibers can be coaxially encapsulated by the inorganic boehmite (AlOOH) ceramics through an adsorption and complexation process is developed. This strategy involves immersing partially imidized PI nanofiber membranes into anhydrous aluminum chloride ethanol solution and dilute ammonia, where the adsorption−complexation and hydrolysis processes are completed. During the hydrolysis process, the PI nanofibers are evenly coated with AlOOH. The amount of AlOOH can be controlled easily by adjusting the concentration of the anhydrous aluminum chloride ethanol solution. After being encapsulated with AlOOH, the separator exhibits better mechanical properties, wettability, thermal stability, cycling durability, and a high capacity, along with faster ion transport speed. All excellent features prove that the PI@AlOOH composite nanofiber membrane is an advanced high-performance LIB separator.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Junfeng Yu,Nanxi Dong,Bingxue Liu,Guofeng Tian,Shengli Qi,Dezhen Wu
Polymer separators with high-temp dimensional stability is strongly demanded for high-safety lithium-ion batteries (LIBs). In this study, a novel polyimide (PI) microsphere coating slurry was prepared and then plated on Celgard polypropylene (PP) separator, producing PP@PI microsphere composite separator with excellent thermal stability, flame retardancy, high liquid retention capacity and high ionic conductivity by a simple blade-coating process. The results show that the thermal stability and liquid retention capacity of the PP@PI microsphere composite separator are significantly improved. Compared with the pure commercial PP separator which sharply shrank at 150 °C, the PI microsphere composite separator shows negligible shrinkage over 150 °C. The obtained PP@PI microsphere composite separators exhibited excellent thermal stability and fire-resistance properties. At the same time, the peel strength of composite separator reached 138.6 N·m −1 , with excellent adhesion. The surface density of PP@PI microsphere composite separator is 16.62 g·m −2 , which is lower than 30.22 g·m −2 of ceramic coated composite separator. Electrochemical characterizations indicate that the discharge capacity and capacity retention rate of the battery assembled with PP@PI microsphere composite separator are significantly higher than those assembled with the pure PP separator. The half-cell assembled with this composite separator shows a high capacity of 144.3 mAh·g −1 at 5C, which is much higher than the 117.8 mAh·g −1 of the commercial PP separator equipped battery. Moreover, the lithium-ion batteries assembled with the PP@PI microsphere composite separator show excellent cycle stability after 200 cycles at 1C. More importantly, the lithium-ion battery assembled with PP@PI microsphere composite separator has excellent safety at high temperature. These features demonstrate the potential of PP@PI microspheres composite membrane as high-security separator for LIBs.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2020
·
IF 5.774
Rongrong Qiang,ChenJie Wei,Ligang Lin,Xuesong Deng,Tiantian Zheng,Qi Wang,Yixin Gao,Yuzhong Zhang
Nowadays, the separation efficiency and stability of nanofiltration (NF) membrane are of widespread concern. Inspired by the biomineralization phenomenon and its unique structure with siliceous framework, a polyimide (PI) NF membrane decorated with “silica hard phase-polymer soft phase” 3D interwoven sponge bionic structure was fabricated via a simple and effective one-step phase inversion strategy. The obtained membranes demonstrated high pure water permeability of 65 L/(m 2 ·h) and rejections of Na 2 SO 4 (91.55%) and NaCl (30.21%) at 0.4 MPa, respectively. Moreover, siliceous sponge-like structures were determined by SEM analysis, with the degree of cross-linking after membrane pore regulated as high as 88.89%. The integrity and long-term stability of the membrane in different organic solvents, including methanol, cyclohexane, acetone, ethyl acetate, n -heptane, absolute ethanol and toluene were maintained for 72 h at 0.8 MPa. Furthermore, the PI/SiO 2 membrane with siliceous sponge biologically unique structure gives rise to a scope of bioinspired membranes and shows promising prospect for the treatment of solutions in extreme environments.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2020
·
IF 5.774
Kuo Chen,Peng Li,Hongyu Zhang,Haixiang Sun,Xiujie Yang,Dahu Yao,Xianjuan Pang,Xiaolei Han,Q. Jason Niu
Organic solvent nanofiltration (OSN) has a good application prospect in the field of organic solvent separation, but low organic solvent permeance is the main obstacle restricting its application. This work reports a thin film composite (TFC) nanofiltration membrane prepared by interfacial polymerization (IP) on the HKUST-1 MOF interlayer grown in situ on a crosslinked polyimide (PI) substrate. The MOF interlayer improves the hydrophilicity and porosity of the support membrane. In addition, the MOF interlayer controls the diffusion of piperazine (PIP) during the IP process, which induced to form a thin and highly crosslinked polyamide (PA) separation layer. The increased effective membrane area and the reduced thickness of PA separation layer resulted in a methanol permeation flux up to 9.59 L·m −2 ·h −1 ·bar −1 , while maintaining the rejection of the negatively charged Brilliant Blue G 250 dye (MW = 858.05 g·mol −1 ) at 98.8%. Furthermore, the stability of the TFC membranes in polar aprotic solvents such as N, N-dimethylformamide highlights their potential for OSN applications in chemical industries.
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高影响因子
POLYMER
·
2019
·
IF 3.771
Yiyao Tian,Longbo Luo,Qiqi Yang,Lingjie Zhang,Ming Wang,Difeng Wu,Xu Wang,Xiangyang Liu
Low coefficient of thermal expansion (CTE) in the range of 40–400 °C is a crucial factor for polyimide (PI) films serving as the flexible substrate for display devices. The introduction of hydrogen bonds (H-bonds) is an effective method to obtain high Tg and low in-plane CTE below polyimide (PI) film. However, these H-bonds commonly exhibit low thermal stability and would be ruptured at high temperature (>300 °C), which leads to a remarkable increase of CTE. Herein, we report a strategy to improve thermal stability of H-bonds at the high temperature via intermolecular crosslinking. For neat PI, its in-situ FTIR results confirm severe dissociation of H-bonds above 300 °C, While after the crosslinking reaction, the content of strong H-bonds at 400 °C is 110% higher than that of neat PI, which indicates this intermolecular crosslinking restrains dissociation of H-bonds. Correspondingly, CTE values of crosslinked PI films at 300 o C–400 °C are sharply decreased from 33.8 ppm/K to 6.0 ppm/K. Moreover, decrease of in-plane orientation accompanying lower CTEs in crosslinked PI deviates from common rule reported in linear PIs, implying the important roles of H-bonds and crosslinking. More over, the contribution of H-bonds and crosslink to the decrease of CTE are performed by Pearson correlation analysis and the results indicate that the decrease of CTE in crosslinked PIs at low temperatures is completely attributed to confinement effect of crosslinking, but contribution of stable H-bonds becomes more prominent above 300 °C. Consequently, the obtained PI films exhibit ultra low CTE (1.9 ppm/K) at the range of 40 o C–400 °C, along with high Tg (>450 °C) exhibiting great potential for flexible-display substrates.
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高影响因子
COMPOSITES SCIENCE AND TECHNOLOGY
·
2023
·
IF 9.1
Hao Wang,Naihang Kuang,Ziqiao Wang,Yanzhi Wang,Zidie Song,Chunhua Zhang
The structure and properties of carbon fiber reinforced composites (CFRC) depend on main factors, especially the unpredictable interface. In this work, a kind of thiocarbonyl disulfide compound is introduced to achieve the catalyzed-cure of phenylethynyl terminated polyimide (PI) and plays the role of coupling medium to constitute covalent-bonded structure at the PI/CF interface. The organocatalyzed cure not only follows the free radical mechanism with an initial curing temperature down to 260.4 °C, but also endows the composite with reduced internal thermal stress and enhanced interface structure . Due to both CF surface-initiated free radical curing reaction and coupling reaction between thiocarbonyl-containing PI matrix and hydroxyl-rich sizing layer, the composite performs an improved interfacial shear strength (IFSS) of 123.9 MPa, being 2.47 times as the thermally cured ones, plus the anti-bacterial reinforcement of the PI matrix. Besides, the interface enhancement brings the CFRC specimen improved electrical properties, performing a 92.6% increase of transverse electrical conductivity to 367.6 S/m. This study gives perspective for improving the interfacial performance of high-temperature processed CFRC with “as-received” fiber reinforcers, plus a clear outlook to future research directions and open challenges to prepare high-performance CFRC.
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高影响因子
ACS Applied Nano Materials
·
2023
·
IF 5.9
Zhaoqing Lu,Zizhan Guo,Jingru Zhang,Fengfeng Jia,Jiayue Dong,Yuanqing Liu
Polymeric hybrid sensors have garnered great interest in health monitoring, human–computer interaction, and soft robotics for their lightweight, flexibility, and feasible fabrication process. However, polymeric hybrid sensors suitable for harsh environments remain a considerable challenge, limiting further application. Herein, polyimide (PI)/carboxylated multi-walled carbon nanotube (c-MWCNT) hybrid aerogel fibers with a micro-porous structure were fabricated via wet-spinning and chemical thermal imidization. The fabricated PI/c-MWCNT hybrid aerogel fibers’ conductivity and the change of current in response to the bending degree were tested, in which the relative current change achieved 4.78% with a bending degree of 150°. The fibers possessed a density of 0.41 ± 0.06 g/cm3, a conductivity of 17.8 ± 2.9 μS/m, and a tensile strength of 13.0 ± 1.1 MPa. In addition, they exhibited excellent heat/cold durability, whose decomposition temperature, cold resistance, and service life were 367 °C, −196 °C, and 300 cycles, respectively. Furthermore, the fabric sensor woven with PI/c-MWCNT hybrid aerogel fibers demonstrated two sensitivity stages of stage 1 (S1) = 6.04 and stage 2 (S2) = 0.55 under various pressures. Besides, it could be heated to 62 °C at a voltage of 30 V in 90 s with a changing resistance. The above properties demonstrate that the as-prepared fabric sensor exhibited great application potential for information acquisition and joule heating in harsh environments.
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高影响因子
COMPOSITES PART B-ENGINEERING
·
2019
·
IF 6.864
Tadele Daniel Mekuria,Chunhong Zhang,Diaa Eldin Fouad
SiC@SiO 2 core-shell nanostructured particles were successfully prepared via simple thermal treatment. The structure of the surfaces of pristine SiC and SiC@SiO 2 core-shell nanostructured particles was investigated by X-ray diffraction spectroscopy (XRD). The formation of SiO 2 shell on the SiC core was further evaluated by FTIR , SEM , XPS and TEM techniques. The nanostructured particles prepared were amino-modified by APTMS and incorporated in polyimide (PI) matrix to prepare highly flexible composite films . The mechanical, thermal, UV-shielding and water proof properties of the composites were investigated. The TGA results displayed that T 5 (5% weight loss temperature) and T 10 (10% weight loss temperature) were meaningfully enhanced up to 56.0 °C and 53.4 °C, respectively upon adding various amounts of modified SiC@SiO 2 nanoparticles into the PI matrix. DSC results revealed that the glass transition temperature ( T g ) was considerably enhanced up to 45.50 °C, up on the incorporation of different dosages of SiC@SiO 2 –NH 2 nanoparticles in the matrix. The tensile results shown that introduction of the nanoparticles into the PI medium exhibited highly significant improvement in the tensile strength and the Young's modulus over 77.1% and 96.6% respectively as compared to the neat PI. The incorporation of SiC@SiO 2 –NH 2 nanostructured particles in the matrix highly improved the hydrophobicity of the composites up to 62.55% as compared to the neat PI. The UV-shielding properties were also enhanced when functionalized SiC@SiO 2 –NH 2 was added to the PI matrix. The dispersion of SiC@SiO 2 in the PI matrix was investigated by Scanning electron microscope (SEM).
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高影响因子
APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Le Zhang,Enlin Han,Yulun Wu,Xiaodong Wang,Dezhen Wu
The surface decoration of short-cut polyimide (PI) fibers with multi-walled carbon nanotubes (MWCNTs) was performed by fabricating a polydopamine (PDA) coating layer on the fiber surface and then immobilizing MWCNTs onto the coating layer via covalent bonding. This successful surface decoration was confirmed by scanning electron microscopy, X -ray photoelectron spectroscopy, Fourier -transform infrared microscopy and static water contact angle. The application of the surface-decorated PI fibers as reinforcing fibers for reinforcement of polycarbonate (PC)/acrylonitrile–butadiene–styrene copolymer (ABS) alloy was investigated, which indicated that the MWCNTs-decorated PI fibers not only could effectively reinforce the PC/ABS alloy but also generated a significant lightweighting effect on the resulting composites. The maximum mechanical properties were achieved for the composites at a fiber content of 20 wt.% and a fiber length of 3 mm. This significant reinforcement effect is attributed to the enhancement of interaction bonding strength between the fibers and matrix as a result of the surface decoration of PI fibers with MWCNTs. The morphological investigation suggested that fiber rupture was the major energy dissipation mechanism in the tensile and impact failures, whereas fiber debonding and pullout were partly involved in the fracture energy dissipation. In addition, the presence of surface-decorated PI fibers slightly enhanced the thermal stability and load bearing capability of composites. This work can provide a type of high-performance lightweight composite material for automobile and aviation industries.
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高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2019
·
IF 7.65
Mingyu Wei,Xiaowen Shi,Ling Xiao,Haifei Zhang
Polyimide-modified carbon nanotubes (PI/CNTs) were synthesized via a solvent-free thermal method and used as a metal-free catalyst to activate peroxymonosulfate for organic contaminant degradation without light irradiation. The characterization results suggested that PI was loaded onto the surface of CNTs . The catalytic ability of the PI/CNTs was strongly correlated with the content of PI in the catalysts. The PI/CNTs (22% of PI) showed the highest catalytic efficiency for organic pollutant degradation at room temperature. The degradation efficiency of acid orange 7 (AO7) dye was significantly enhanced to 98.9% within 15 min, compared to the efficiency of 2.2% exhibited by pure PI. The radical quenching tests and electron paramagnetic resonance spectrometry proved that singlet oxygen, instead of hydroxyl radicals or sulfate radicals, played a dominant role during the catalytic oxidation of AO7. The influences of operation parameters including temperature and catalyst amount were investigated. The PI/CNTs metal-free catalyst exhibited high catalytic activity under a broad range of pH values. The recycling study of four repeated reactions demonstrated good stability of the PI/CNTs. This work provided a promising metal-free catalyst for degradation of organic pollutants in aqueous solutions, contributing to the development of green materials for sustainable remediation.
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DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）