HIGH PERFORMANCE POLYMERS
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2025
·
IF 1.6
Bo Mu,Wei Li,Yunpeng Li,Wenyi Zhang,Bangrui Kou,Baoping Yang,Junhong Guo,Li Chen,Li Tian
In this manuscript, polyimide (PI) films with high strength and toughness are achieved by adjusting the stiffness and flexibility of the PI macromolecules utilizing rigid mixed diamine monomers, namely benzimidazole (PABZ) /benzoxazole (BOA) and flexible bisphenol A dianhydride (BPADA) monomer. Meanwhile, the stiffness of the PI is modulated as well by the coordination crosslinking between benzimidazole motifs of PABZ and Cu2+ validated by FTIR, XPS and UV-vis spectra, respectively which could boost the arrangement and packing of the PI molecules confirmed by the packing coefficient. The comprehensive properties of the polyimide film are synergistically increased by combining the rigidity/flexibility of the macromolecules and the reversible coordination effect, with a strength and toughness of the PI film reaching 132.43 ± 1.73 MPa and 21.24 ± 2.13 MJ/m3 respectively, as well as the decomposition temperature 5% weight loss (Td5%) and glass transition temperature (Tg) attaining at 514°C and 251°C. More interestingly, the PI films exhibit excellent wear resistance with the volume wear rate reduced from 15.578 × 10-6 mm3/Nm to 2.936 × 10-6 mm3/Nm which accounts for a reduction of 81.2% compared to neat PI. Therefore, high-strength/toughness, improved thermal stability and excellent wear-resistant PI films can be fabricated utilizing a synergistic strategy of stiffness-flexibility harmonization which is expected to provide a novel design strategy for the high-performance PI application.
研究领域:
材料科学
·
高分子化学
·
纳米技术
·
表面工程
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DOI
高影响因子
POLYMER
·
2026
·
IF 5.1
Caizhe Sun,Mei Li,Yuefei Zou,Xiaolin Xue,Qunhao Wang,Jiangqi Zhao,Wei Zhang,Canhui Lu
Currently, the advancement of aqueous zinc-ion batteries (ZIBs) is extensively hampered by challenges such as formation of zinc dendrites and side reactions on the zinc anode. As a crucial element of batteries, the separator can greatly affect battery performance, and the present study aims to develop a novel separator to tackle the above challenges in aqueous ZIBs. Toward this end, a nonwoven fabric of fluorinated polyimide/cellulose (fPC) composite nanofiber is succesfully manufactured through electrospinning. The resultant membrane exhibits a uniform pore structure, abundant zincophilic groups, high hydrophilicity and excellent mechanical properties. When used as a separator for aqueous ZIBs, the fPC membrane can effectively promote zinc ion transport and achieve uniform Zn 2+ deposition, effectively and concurrently suppressing both dendrite formation and side reactions. As a consequence, the aqueous Zn||Zn symmetric cell assembled with fPC exhibits superior cycle stability over 1800 h at 1 mA cm −2 /1 mAh cm −2 , while the aqueous Zn||MnO 2 full cell displays excellent rate performance and stable cycling performance, suggesting the high potential of fPC in real-world aqueous ZIB applications.
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高影响因子
Membranes
·
2023
·Vol. 13
·期 5
·461
·
IF 4.2
Yuxuan Zhao,Hongyan Wang,Xiangyun Liu,Xueping Zong,Jiangzhou Luo,Song Xue
The 6FDA-based network PI has attracted significant attention for gas separation. A facile strategy to tailor the micropore structure within the network PI membrane prepared by the in situ crosslinking method is extremely significant for achieving an advanced gas separation performance. In this work, the 4,4′-diamino-2,2′-biphenyldicarboxylic acid (DCB) or 3,5-diaminobenzoic acid (DABA) comonomer was incorporated into the 6FDA-TAPA network polyimide (PI) precursor via copolymerization. The molar content and the type of carboxylic-functionalized diamine were varied in order to easily tune the resulting network PI precursor structure. Then, these network PIs containing carboxyl groups underwent further decarboxylation crosslinking during the following heat treatment. Properties involving thermal stabilities, solubility,d-spacing, microporosity, and mechanical properties were investigated. Due to the decarboxylation crosslinking, thed-spacing and the BET surface areas of the thermally treated membranes were increased. Moreover, the content of DCB (or DABA) played a key role in determining the overall gas separation performance of the thermally treated membranes. For instance, after the heating treatment at 450 °C, 6FDA-DCB:TAPA (3:2) showed a large increment of about ~532% for CO2gas permeability (~266.6 Barrer) coupled with a decent CO2/N2selectivity~23.6. This study demonstrates that incorporating the carboxyl-containing functional unit into the PI backbone to induce decarboxylation offers a practical approach with which to tailor the micropore structure and corresponding gas transport properties of 6FDA-based network PIs prepared by the in situ crosslinking method.
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高影响因子
MICROCHEMICAL JOURNAL
·
2023
·
IF 4.8
Yongfeng Mu,Pengfei Jin,Li Zheng,Chao Wang,Yanjie Hou,Weiwei Liu,Liangyou Si,Zhihui Liu
Polymers have been widely used in the fabrication of humidity sensing materials, although, issues including sensitivity and hysteresis still exist, limiting its potential. Herein, we aim to enhance the humidity sensing performances of a polyimide (PI) capacitive-type relative-humidity sensor via a simple and efficient approach. Specifically, modified halloysite nanotubes (HNTs) were doped in the polyimide sensing layer to optimize the humidity sensing capabilities of the MEMS (Micro-electromechanical Systems)-based sensor. The configurational and morphological characteristic of the sensing membrane with different content of the nanofiller were characterized. The humidity sensing capabilities of the enhanced sensors were investigated under the relative humidity (RH) range of 10–90%. Owing to the rational structure design of the sensing layer, the modified sensor exhibited enhanced sensitivity, low humidity hysteresis and good linearity. The highest sensitivity of the device with the best overall performance reached 0.87 pF/%RH, which is 1.81 times that of the pure PI based humidity sensor. Meanwhile, the sensor maintained moderate humidity hysteresis (2.18%) as well as good linearity (R 2 = 0.9813) within the humidity boundary from 10 to 90% RH. The aforementioned advantages of the PI-HNTs-NH 2 based humidity sensor demonstrate its promising application in humidity measurement. As a low-cost and effective additive, HNTs own great application potential in the preparation of polymer sensing devices. This work provides valuable guidance for fabricating humidity sensors with outstanding sensing performances.
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DOI
高影响因子
Nano Energy
·
2023
·
IF 17.6
Changyang Li,Peng Wang,Dun Zhang
Self-healing triboelectric nanogenerators (TENGs) are new, stable and durable energy harvesters . Polyimide (PI) is a promising negatively charged material that has been widely developed as a negative friction material for TENGs, but self-healing PI-based TENGs are currently vacant. Here, we reported a self-healing TENG device fabricated by self-healing PI for energy harvesting and motion sensing. The designed and fabricated PI-based TENGs exhibited excellent intrinsic self-healing and shape tailorability properties. The self-healing properties are derived from the dynamic disulfide bond exchange and flexible PDMS fragments in the PI backbone, which can recover its damage and output performance at 100 °C for 3 h. The output performance of the fabricated 6FDA-4PDA-PDMS-PI-based TENG was double that of the normal PI-based TENG due to CF 3 electron-absorbing groups and siloxane fragments in the PI backbone. Finally, the applications of self-healing PI-based TENGs to harvest energy to drive commercial electronic devices and joint motion sensing were demonstrated. This work provides theoretical guidance for the fabrication of self-healing TENGs with reliable output performance and practical applications, contributing to the future of sustainable energy and wearable electronics .
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高影响因子
ENERGY & FUELS
·
2023
·
IF 5.3
Xiaochen Cui,Guangxu Xu,Zhihao Gao,Shaoyin Zhu,Yuling Zhao,Xiaoyao Mo,Zhenyue Gao,Zongmin Zheng,Jianmin Zhang
High-performance and eco-friendly carbon electrode material for supercapacitors is still a challenge for both academia and industry. In this work, polyimide waste (PI)-derived, hierarchically porous, and nitrogen-rich carbon materials were prepared by simple hydrothermal treatment and carbonization using potassium hydroxide (KOH) as an activator. The effects of KOH/preoxidized PI mass ratio and hydrothermal treatment time on the morphology, chemical and crystalline structure, and electrochemical performance were systematically investigated. Interestingly, it is noticed that hydrothermal treatment with KOH solution can promote the infiltration and destruction of preoxidized PI, thereby enhancing the activation effect and forming a hierarchically porous structure. The specific surface area (SSA) of porous carbon with hydrothermal treatment (e.g., PIC2-24h) was as high as 2593 m2 g–1, which is much larger than that of porous carbon without hydrothermal treatment (PIC2). The as-prepared PIC2-24h presented a high specific capacitance of 229 F g–1 at 1 A g–1, superb rate performance (205 F g–1 at 10 A g–1), and excellent cycle stability (94% capacity retention after 20,000 cycles at 1 A g–1), revealing that these PI-derived porous carbon materials can not only alleviate the environmental stress caused by the disposal of PI waste but also provide an ideal candidate electrode for high-performance supercapacitor applications.
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高影响因子
Energy Technology
·
2022
·Vol. 11
·期 2
·2201084
·
IF 4.149
Lang Wang,Xinyu Wang,Binxin Song,Zhe Wang,Fang Wan
Zinc-ion batteries (ZIBs) are developing rapidly, due to the merits of rich resources, superior security, high theoretical capacity, and attractively low price of zinc anodes. Nevertheless, the growth of zinc dendrite and hydrogen evolution leads to the unstable and poor cycling life in ZIB systems, thus impeding the development of ZIBs. Herein, a facile polymer coating approach is applied to establish an artificial solid–electrolyte interface to restrain the frenzied growth of zinc dendrites and hydrogen evolution. The –CO–N–CO– group in polyimide (PI) has strong interaction with Zn 2+ . Therefore, PI coating significantly improves the wettability between anode and electrolyte and realizes rapid Zn 2+ transfer kinetics. As a result, the PI-Zn symmetrical battery not only reaches a stable cycling performance more than 900 h at 1 mA cm −2 , but also owns a smaller overpotential than bare Zn. When integrating the PI-Zn anode with a CaV 8 O 20 cathode, the PI-Zn//CaV 8 O 20 battery maintains a capacity of 306.5 mA h g −1 after 2000 cycles, which is much higher than that (198 mA h g −1 ) of a Zn//CaV 8 O 20 battery. This work provides a simple, yet effective method to improve the electrochemical performance of ZIBs.
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高影响因子
POLYMER
·
2023
·
IF 4.6
Zhuojian Wang,Fengxia Liu,Wei Wei,Chao Dong,Zhiyi Li,Zhijun Liu
A semi-continuous supercritical drying process was proposed to greatly improve the drying efficiency in producing polyimide aerogels . The influence of supercritical fluid parameters such as pressure and temperature on the aerogel properties were systematically investigated, based on the vapor-liquid equilibrium diagram of the ethanol-CO 2 binary system. Results showed supercritical drying efficiency was critical for the comprehensive properties of the aerogel, because solvent retention in the aerogel after drying could cause depressurization-induced shrinkage and a subsequent change in nano-structure in the vacuum drying that ensued. By continuous scCO 2 flushing at 90 °C and 16 MPa with the total drying time as short as 3 h, the aerogel showed a satisfactory shrinkage as low as 11.5%, a large specific surface area as high as 344.3 m 2 /g. Our findings also showed that the subcritical drying condition slightly below the critical mixture pressure of the binary system could provide special interest.
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高影响因子
Polymers
·
2023
·Vol. 15
·期 4
·903
·
IF 5
Duoping Zhang,Chenghai Ma,Peidong Shi,Zuan Yang,Tongwei Rong,Liurui Xiong,Wenhui Liao
In this study, a series of highly crystalline π-conjugated polyimide photocatalysts with porous nano hollow shell (HSPI) was prepared for the first time by the hard template method by adjusting the addition ratio of the template precursor. SiO2nanospheres not only serve as template agents but also as dispersants to make precursors of SPI more uniform, and the degree of polymerization will be better, resulting in significantly enhanced crystallinity of HSPI relative to bulk SPI (BSPI). More strikingly, it is found that HSPI has a larger specific surface area, stronger visible light absorption, and higher separation efficiency of photogenerated electron and hole pairs compared with BSPI by various spectral means characterization analysis. These favorable factors significantly enhanced the photocatalytic degradation of methyl orange (MO) by HSPI. This work provides a promising approach for the preparation of cheap, efficient, environmentally friendly, and sustainable photocatalysts.Keywords:porous hollow shell;sulfur-doped polyimide;solar light;degradation of MO
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DOI
PubMed
高影响因子
Nanoscale
·
2023
·Vol. 15
·期 8
·4114-4122
·
IF 6.7
Huiya Lan,Bin Wu,Yuye Yan,Ru Xia,Jiasheng Qian
Interfacial thermal resistance is the main barrier restricting the heat dissipation of thermal management materials in electronic equipment. The interface structure formed by covalent bonding is an effective way to promote interfacial heat transfer. Herein, an integrated composite with multi-aspect covalent bonding beneficial for heat transmission is constructed by polyimide (PI) polymerization with maleimide modified graphene nanosheets (M@GNS). The interfacial structure with low thermal resistance built by covalent bonding and oriented graphene arrangement initiated by the coating process makes the in-plane thermal conductivity of the composite as high as 16.10 W m−1 K−1. Finite element simulation and 1000 bending tests are carried out to further verify the performance advantages of the integrated structure in the internal thermal diffusion and long-term use of the composite. M@GNS/PI with integrated structure provides extra heat transfer channels for heat dissipation, possibly providing an effective way to address the traditional thermal accumulation issue of electronic devices.
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PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2023
·Vol. 58
·期 26
·10686-10698
·
IF 4.5
Pan Chen,Wei Xing,Feng Yuting,Wei Zhenzhen,Zhao Yan
The separator is an essential component of lithium-ion batteries (LIBs), and polyimide (PI), a high-performance polymer with outstanding mechanical and thermal properties and a strong electrolyte affinity, has received substantial research as a potential separator material. In this work, we fabricated a PI composite separator (PI/WO 3 ) by combining the components in one step with concurrently electrospinning the precursor solution and electrospraying the WO 3 nanoparticles. The one step mixing method made the WO 3 uniformly distribute on the PI nanofiber surfaces with a result of porosity decrease. Although the introduction of WO 3 nanoparticles did not alter the chemical structure and the excellent thermal stability, the electrolyte wettability, mechanical strength and electrochemical performance of PI separator were all significantly improved by the nanoparticles, endowing the composite separator with superior cycle stability. Therefore, the use of WO 3 in a polyimide separator has practical significance for high safety and high performance of LIBs.
Graphical Abstract
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高影响因子
ACS Applied Polymer Materials
·
2023
·
IF 5
Xiaolong Sun,Qingqing He,Yue Hou,Xuan Zheng,Peng Bi,Yufeng Xu,Xingzhong Zhang,Yong Liu,Rui Xiong,Yang Yang,Ziyu Wang
Polyimide (PI) nanofibers are highly suitable for applications in wearable electronic devices due to their excellent mechanical flexibility and good durability. Herein, a low-cost, self-healing flexible pressure sensor (PI@Ag) is demonstrated that is based on silver-nanoparticle-modified polyimide. Uniformly distributed Ag nanoparticles form a three-dimensional conductive network on the nanofiber, which imparts the flexible sensor with high sensitivity (197 kPa–1), wide response range (100 Pa–50 kPa), fast response time (400 ms), low operating voltage (0.02 V), and excellent durability (loading/unloading test of 2000 cycles under 10 kPa). Moreover, the self-healing encapsulating material can protect the inner sensing material when the surface of the sensor is damaged, thereby ensuring the integrity of the pressure sensor. The prepared PI@Ag sensors demonstrate the ability to monitor an entire range of motions when they are attached to human body. Furthermore, equipping the PI@Ag sensors with wireless Bluetooth connectivity enables users to transmit messages via Morse code. The PI@Ag sensors are expected to be widely used in motion monitoring, disease diagnosis, and human–machine interaction.
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高影响因子
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