Polymers
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2020
·Vol. 12
·期 2
·442
·
IF 3.426
Guangtao Qian,Mengjie Hu,Shangying Zhang,Mengxia Wang,Chunhai Chen,Jianan Yao
To achieve polyimide-metal complexes with enhanced properties, 5-amine-2-(5-aminopyridin-2-yl)-1-methyl-benzimidazole (PyMePABZ) that contains stiff 2-(2′-pyridyl)benzimidazole (PyBI) was synthesized and exploited to construct the Cu(ΙΙ)-crosslinked polyimides (Cu-PIs). These Cu-PIs exhibited higher dielectric, thermal, and mechanical properties with an increase in Cu2+content. Among them, their dielectric constants (εrS) were up to 43% superior to that of the neat PI, glass transition temperatures (Tgs) were all over 400 °C, and 5% weight loss temperature (T5%) maintained beyond 500 °C. These data indicate that the metal coordination crosslinking provided a useful guide to develop high performance PIs which possess potential application as useful high temperature capacitors.Keywords:polyimide;metal coordination crosslinking;high performance
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
PubMed
高影响因子
Journal of Low Power Electronics and Applications
·
2018
·Vol. 8
·期 3
·32
·
IF 0
Peiyuan Ji,Yi Xi,Chengshuang Zhang,Chuanshen Wang,Chenguo Hu,Yuzhu Guan,Dazhi Zhang
Porous materials have superior electrochemical performance owing to its their structure, which could increase the specific and contact area with the electrode. The spinel Li4Mn5O12has a three-dimensional tunnel structure for a better diffusion path, which has the advantage of lithium ion insertion and extraction in the framework. However, multi-space spherical materials with single morphologies are rarely studied. In this work, waxberry-like and raspberry-like nanospheres for Li4Mn5O12have been fabricated by the wet chemistry and solid-state methods for the first time. The diameter of a single waxberry- and raspberry-like nanosphere is about 1 μm and 600 nm, respectively. The specific capacitance of Li4Mn5O12was 535 mF cm−2and 147.25 F g−1at the scan rate of 2 mV s−1, and the energy density was 110.7 Wh kg−1, remaining at 70% after 5000th charge-discharge cycles. Compared with raspberry-like nanosphere Li4Mn5O12, the waxberry-like nanoporous spinel Li4Mn5O12shows the better electrochemical performance and stability; furthermore, these electrochemical performances have been improved greatly compared to the previous studies. All these results indicate that the waxberry-like nanoporous spinel Li4Mn5O12could provide a potential application in high performance supercapacitors.Keywords:supercapacitors;Li4Mn5O12;waxberry-like nanosphere;high performance
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
SENSORS AND ACTUATORS B-CHEMICAL
·
2018
·
IF 5.667
Yi Li,Yanbiao Li,Minoru Hashimoto
In this work, a novel planar actuator based on plasticized poly (vinyl chloride) gel and flexible silicone grease electrodes is proposed to realize a new soft actuator with high performance under low driving voltages. The proposed planar PVC gel actuator (PPGA) can demonstrate a strain of 21%, an output stress of over 0.6 MPa and a respond time of about 90 ms, only at a low driving voltage of 120 V. These performances are comparable to those of the biological muscle and are much better as compared to 10–12% strain and 0.09 MPa stress at 400 V for the traditional stainless electrodes-based multilayered PVC gel actuator (MPGA). In addition, compared to the typical planar dielectric elastomer actuator (DEA) (3 M VHB4905), the operating voltage and response time for the PPGA are reduced by one order of magnitude. A theoretical model is used to discuss the difference between the two types of actuators, finding a good agreement with the experimental results. Furthermore, the PPGA can be continuously actuated for more than 1 million times which shows a good durability. These results demonstrate the feasibility of PPGA as a soft actuator, so a wide application is expected.
研究领域:
材料科学
·
软体机器人学
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产品关联
DOI
高影响因子
ACS Applied Polymer Materials
·
2024
·
IF 4.4
Tao Peng,Ji Lan,Peng Lu,Cong Deng,Ze-Yong Zhao,Yu-Zhong Wang
Harvesting sustainable biobased elastomers with both high strength and high toughness holds great promise for various applications. However, the inherent conflicts between these properties make it challenging to achieve a simultaneous balance. Here, inspired by the structure of spider silk, we have synthesized a multiphase polymer (PA-BPx) containing oxalamides derived from biomass. The introduction of a benzene ring structure, combined with the double hydrogen bonds of oxalamide, results in smaller and more uniformly distributed hard domains, concurrently enhancing the molecular chain rigidity. The molecular structure described facilitates energy dissipation through the destruction and reformation of hard domains, achieving a remarkable balance between superior mechanical robustness and toughness. The PA-BP40 elastomer demonstrates exceptional advantages in both tensile strength and toughness compared to other reported biobased and filled biobased elastomers, with a toughness of 230 MJ·m–3 and maintaining a high tensile strength of 46.6 MPa. These remarkable mechanical properties make the PA-BP40 elastomer a promising material for various applications where both high strength and toughness are required. Moreover, the elastomers exhibit strong fluorescence even in the absence of conventional chromophores, highlighting their potential for fluorescent anticounterfeiting applications. Overall, this study presents a promising strategy for developing sustainable elastomers with desirable performance characteristics, thus contributing to the advancement of biobased materials in various applications.
研究领域:
材料科学
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生物化学
✓ 已验证
产品关联
DOI
高影响因子
Nature Communications
·
2025
·Vol. 16
·期 1
·1-12
·
IF 15.7
Yang Rongliang,Chen Yi,Pan Yexin,Kim Minseong,Liu Huan,Lee Connie Kong Wai,Huang Yangyi,Tang Aidong,Tu Feiyue,Li Tianbao,Li Mitch Guijun
Lithium–sulfur batteries are expected to supersede existing lithium-ion batteries due to the high theoretical energy density of sulfur cathodes (positive electrodes). Unfortunately, inefficient redox reactions and the “shuttle effect” hinder their commercial development. Assembling high-performance nanostructured sulfur host materials into a sulfur cathode presents a viable solution. However, fabricating host materials and preparing sulfur cathodes involve complicated, multistep, and labor-intensive processes under varying temperatures and conditions, raising concerns about efficiency and cost in practical production. Herein, we propose a single-step laser printing strategy to prepare high-performance integrated sulfur cathodes. During the high-throughput laser-pulse irradiation process, the precursor donor is activated, producing jetting particles that include in-situ synthesized halloysite-based hybrid nanotubes, sulfur, and glucose-derived porous carbon. After laser printing, a composite layer, containing host materials, active materials, and conductive components, is uniformly coated onto a carbon fabric acceptor, forming an integrated sulfur cathode. The laser-printed sulfur cathodes exhibit high reversible capacity and low capacity attenuation during cycling measurements. Furthermore, the laser-printed high-loading samples show high performance in both coin and pouch lithium–sulfur cells. This strategy would simplify the fabrication process in lithium–sulfur battery industry and inspire advancements in other battery research.
研究领域:
材料科学
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电化学
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能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
EUROPEAN POLYMER JOURNAL
·
2021
·
IF 4.598
Shuang Xie,Jiacao Yang,Xiaojun Wang,Jie Yang
Biobased polymers hold the promise of addressing climate change and biodiversity loss due to deriving from renewable carbon. Dimethyl furan-2,5-dicarboxylate as a biobased monomer is potential alternative of terephthalic acid and has been widely used to produce biobased polyesters or polyamides . In this study, excellent performance of poly(decamethylene furanamide) (PA10F) was synthesized via bulk polymerization with 1,5,7-triazabicyclo[4.4.0]dec-5-ene (TBD) as catalyst. For PA10F produced at 200 °C as well as 0.05 MPa, weight-average molecular weight, glass transition temperature ( T g ) and initial decomposition temperature ( T d-5% ) were up to 62500 g/mol, 103 °C and 401 °C, respectively. Furthermore, the mechanical properties were also outstanding with the tensile strength of about 52.12 MPa, elongation at break of about 68.78%, and tensile modulus of about 1636 MPa. According to the result of X-ray diffraction analysis, the PA10F was amorphous.
研究领域:
材料科学
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化学工程
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环境科学
✓ 已验证
DOI
高影响因子
Polymers
·
2020
·Vol. 12
·期 12
·2794
·
IF 3.426
Yunliang Xing,Xianru He,Rui Yang,Kan Zhang,Shengfu Yang
A novel resveratrol-based bio-benzoxazine monomer (RES-al) containing an allyl group has been synthesized using resveratrol, allylamine, and paraformaldehyde via Mannich condensation reaction, and its chemical structures have been characterized by FT-IR spectroscopy and NMR techniques. The polymerization behavior of this benzoxazine resin has been investigated using in situ FT-IR and differential scanning calorimeter (DSC) measurements, and the thermal-mechanical properties of its corresponding polybenzoxazines are evaluated by DMA and TGA. We show that by controlling the curing process of the oxazine ring, the C=C bond in resveratrol, and the allyl group in RES-al, the cross-linking network of the polybenzoxazine can be manipulated, giving rise to tunable performance of thermosets. As all curable functionalities in RES-al are polymerized, the resulted polybenzoxazine exhibits a good thermal stability with aTgtemperature of 313 °C, a Td5value of 352 °C, and char yield of 53% at 800 °C under N2.Keywords:benzoxazine;resveratrol;polybenzoxazine;allyl;high-performance
研究领域:
材料科学
·
有机化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMISTRY OF MATERIALS
·
2020
·
IF 9.567
Xiaobai Li,Hongwei Ma,Peng Wang,Zhenchao Liu,Jinwu Peng,Wei Hu,Zhenhua Jiang,Baijun Liu,Michael D. Guiver
Phosphoric acid-doped polybenzimidazole (PA-PBI) used in high-temperature proton exchange membranes (HT-PEMs) frequently suffers from a serious loss of mechanical strength because of the “plasticizing effect” of the dopant acid. Conventional cross-linking approaches generally enhance membrane stability. However, acid doping levels (ADLs) and consequently proton conductivity inevitably decrease. This is due to the formation of more compact molecular structures and a reduced amount of functional imidazole units, caused by their consumption in introducing the cross-linker. To resolve the common problems of current PA-PBI-based HT-PEMs, herein, a highly acidophilic imidazole-rich cross-linked network with superior “antiplasticizing” ability is constructed based on a novel multifunctional cross-linker. This unique bischloro/bibenzimidazole (“A2B2-type”) molecular structure has extremely high reactivity, including “self-reaction” among the cross-linkers and “inter-reaction” between the cross-linker and PBI molecules. The resulting imidazole-rich cross-linked membranes exhibit the desired combination of high ADLs, high conductivity, outstanding dimensional–mechanical stability, and excellent fuel cell performance. In comparison to a corresponding linear PBI membrane, one membrane with a high content of the cross-linker of 30% has a 100 wt % increased acid uptake, a doubling in proton conductivity at 200 °C, and a maximum power density of 533 mW·cm–2 at 160 °C without humidification.
研究领域:
材料科学
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Min Jiang,Bo-Wen Liu,Feng-Ming He,Qin Zhang,Ao Wang,De-Ming Guo,Hai-Bo Zhao,Li Chen,Yu-Zhong Wang
Although conventional chemical copolymerization method has shown favorable results in improving certain performance of polymers, simultaneous improvement of overall properties is hardly achieved. Here, we reported a feasible method to fabricate high-performance polymers with great overall properties by simultaneously tailoring their chemical constitution and topological conformation. We designed and synthesized a novel functional monomer with a sidechain caged structure based on phosphorus chemistry, and prepared the corresponding aliphatic polyamide as a typical representative of thermoplastic synthetic polymers. The incorporation of a sidechain caged structure enhanced the chain entanglement of the resultant polyamide, thus improved the mechanical strength by 39% and largely enhanced the heat resistance. The great processability was basically uninfluenced due to the easy dissociation of the entanglement during processing, enabling the potentially wide application fields as both fibers and engineering plastics. Furthermore, based on the free radical scavenging effect of the phosphorus-based monomer, the flame retardancy of the resultant polyamide was significantly improved. In sight of these findings, this work provides a novel method for fabricating high-performance polymers for various applications.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2022
·
IF 10.53
Cuihua Ma,Qinghua Li,Zhi Wang,Min Gao,Jixiao Wang,Xingzhong Cao
Polymeric membranes have been widely researched for several decades due to their good processability and low cost. Herein, high-performance thin-film composite (TFC) membranes were prepared by interfacial polymerization using N-methyldiethanolamine (MEDA), 5,5′,6,6′-tetrahydroxy-3,3,3′,3′-tetramethylspirobisindane (TTSBI) and trimesoylchloride (TMC). The effects of segmental chain motion on the gas separation performance of the TFC membranes were investigated for the polymeric membranes featuring rigid and contorted sites along the polymer backbone by inducting TTSBI. The results suggested that the introduction of rigid and contorted structures improved the cavities in the membrane, impeded the transport of larger gas, and enhanced the diffusive selectivity. Therefore, the TFC membrane exhibited high permeance and high selectivity with CO 2 permeance of about 1800 GPU and CO 2 /N 2 selectivity of 370 at 0.11 MPa, which is a remarkable improvement in gas separation performance.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Zhenpeng Zhang,Xiaolin Jiang,Yuanhao Ma,Xun Lu,Zhijie Jiang
High performance has always been the research focus of elastomers. However, there are inherent conflicts among properties of elastomers, such as strength and toughness, strength and damping performance, strength and self-healing ability, etc. Herein, first, we synthesized a unique structure of the dangling chain containing proton donors and receptors. Then, we design and fabricate a kind of high-performance elastomer with a gradient distribution of a dangling chain and a dynamic bond structure. The dangling chains of different lengths intertwine with each other and self-assemble to form a “dense accumulation” structure driven by hydrogen bonds, and the elastomer exhibits special micro/nano scale aggregated states and microphase separation. The “dense accumulation” structure plays a vital role in the increase of mechanical properties. Meanwhile, under the joint action of a dangling chain and a dynamic bond, the damping performance and self-healing performance of the elastomer are greatly enhanced. High strength (27.5 MPa), toughness (121.9 MJ·m–3), 94.8% healing efficiency and outstanding damping performance (tan δ ≥ 0.4, high damping temperature range up to 144 °C) are simultaneously achieved beyond the current state-of-the-art. This topoarchitected polymer with a gradient distribution of dangling chains successfully solves the defects of conventional branched polymers in deteriorating their mechanical properties. This material design provides a new strategy for the development of high-performance structural and functional integrated elastomers.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2024
·Vol. 34
·期 52
·2411029
·
IF 18.5
Qingtao Zeng,Xuejun Lai,Hongqiang Li,Zhonghua Chen,Xingrong Zeng,Liqun Zhang
The preparation of high-performance and fire-safe electrolytes for flexible quasi-solid-state supercapacitors is challenging. In this work, a novel fire-safe and multifunctional deep eutectic solvent gel (DESG) is fabricated using acrylic acid and urea as hydrogen bond donors and choline chloride as a hydrogen bond acceptor. DESG shows a high ionic conductivity (0.552 S m −1 ), good electrochemical performance (specific capacitance: 106.8 F g −1 ), and a wide operating temperature range (−20–90 °C), being a promising candidate for flexible solid-state supercapacitors. Furthermore, it exhibits a good thermoelectric conversion capability (Seebeck coefficient: 1.56 mV K −1 ), being ideal for thermoelectric capacitors and fire-warning sensors. The prepared DESG rapidly self-extinguishes after removal from fire, reaching a limiting oxygen index value of 38.0% and demonstrating its excellent flame retardancy. In addition, DESG has a good self-healing performance (healing efficiency of 84.3%). The work provides new insights into the preparation and application of high fire-safety and multifunctional eutectogels for flexible quasi-solid-state supercapacitors.
研究领域:
材料科学
·
能源存储
·
柔性电子
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）