HIGH PERFORMANCE POLYMERS
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2021
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IF 2.161
Kai Ma,Hanzhou Jiang,Guofei Chen,Wei Wang,Yonggang Zhang
Several polyimides were prepared via two-step polycondensation from novel 2,5-furandicarboxylic acid–based diamine, 2,5-bis[4-(4-aminophenoxy)benzoyl]furan, with commercial dianhydrides. The chemical structures of the monomers and polymers were characterized by FT-IR and NMR in detail, respectively. The polyimides exhibited high performances with 5 wt% weight loss temperatures of over 410 oC, glass transition temperatures of over 214 oC, and tensile strengths and Young’s moduli of up to 130 MPa and 3.2 GPa, respectively. The thermal crosslinking mechanism was studied by FT-IR, Raman spectroscopy, and model reaction analysis, which showed the Diels–Alder reaction between the furan group and diphenylethylene group was the main reaction. The crosslinked polyimide films showed improved solvent resistance, and thermal and mechanical properties.
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RSC Advances
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2019
·Vol. 9
·期 71
·41943-41954
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IF 3.049
Meifang Liu,Yueqing Zheng,Yiyang Liu,Zhanwen Zhang,Yuguang Wang,Qiang Chen,Jing Li,Jie Li,Yawen Huang,Qiang Yin
Driven by the need to prepare monodisperse compound droplets, the formation mechanism of compound droplets was comprehensively investigated. With increasing poly(vinyl alcohol) (PVA) concentration in the W2 phase, the formation mechanism of inner W1 droplet is not affected while the behavior of the O phase in the W2 phase is different. The W1/O compound droplets can form stably in an inner squeezing – outer dripping regime, but the structure of the W1/O compound droplets are affected by the formation time matching between inner W1 droplet and W1/O compound droplets, which influences the stability of the compound droplets. Moreover, the formation process of the W1/O compound droplet is composed of cone recoiling, neck formation, neck developing, neck thinning and neck pinch-off. The formation time of the W1/O compound droplet is mainly determined the neck formation stage. The higher interfacial tension is unfavorable to the neck formation at the initial stages, but it makes the Laplace pressure difference increasing, which promotes the thinning of the neck in the neck pinch-off stage. The results provide more in-depth insights of the effects of surfactants on the formation of compound droplets, benefiting for preparing monodisperse and stable compound droplets.
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POLYMER DEGRADATION AND STABILITY
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2018
·
IF 3.193
Feng Bao,Yuanyuan Song,Qian Liu,Ce Song,Cheng Liu,Jinyan Wang,Xigao Jian,Jinqiu Xiao
The bio-based high-performance engineering plastics poly (aryl ether ketone) are required to be prepared with the threats of increasing shortage of petroleum resources. In this work, a novel green bio-based poly (aryl ether ketone) (PFBEK and PFDEK) based on the bio-based monomer 2,5-furandicarboxylic acid have been successfully synthesized via the nucleophilic aromatic substitution polymerization. The fossil-base polymers PDBEK and PDDEK were prepared as comparison. The chemical structures of the resins were investigated in detail by 1 H NMR and FTIR. WAXD measurements revealed that all the polymers presented amorphous structures. The T g of PFBEK and PFDEK are slightly decline when compared with the corresponding petroleum base resin due to the fractional free volume (FFV) increased by the nonlinear structure of the furan as confirmed by computer simulations. The results of thermal degradation kinetics showed that the thermal stability of the resin decreased when furan replaced phenyl. Nevertheless, the bio-based resins (PFBEK and PFDEK) still exhibited excellent thermal stability. Rheological test revealed that the viscosity of bio-based resins has significantly decreased compared with petroleum base resins. Hence, the new bio-based polymer can be processed at a lower temperature. Besides, the mechanical properties of PFBEK and PFDEK are comparable to the corresponding petroleum-based resins. Moreover, all the polymers showed outstanding solubility in organic solvents , such as NMP, DMAc and so on. Consequently, these two kinds of resins with excellent mechanical properties and processability, which is greener than petroleum base resins, meeting the requirements of sustainable development and can be potential to substitute the petroleum-based resins.
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GREEN CHEMISTRY
·
2018
·Vol. 20
·期 11
·2526-2533
·
IF 8.586
Hanqing Lv,Nan Wang,Lihua Zhu,Yuqi Zhou,Wenjing Li,Heqing Tang
The design of large-scale processes for disposing harmful perfluorooctanoic acid (PFOA) is an important issue, since it was listed as a persistent organic pollutant in 2015. In this work, we developed an alumina-mediated solid-state mechanochemical (MC) method to simultaneously degrade PFOA and synthesize 1H-perfluorohept-ene (1H-1-PFHp), which is a valuable organofluorine block. A 2.5 h MC treatment resulted in a nearly complete removal (99.4%) of PFOA and a high yield (92.5%) of 1H-1-PFHp. In this transformation, the surface hydroxyl groups on alumina are critical for anchoring the PFOA molecules during the defluorination reaction, and the milling process promotes the dehydration of alumina to produce reactive Lewis acid sites for activating the C–F bonds. Moreover, the high energy ball milling initiates simultaneously the release of lattice oxygen from alumina, producing oxygen vacancies (in alumina) and free electrons, the latter of which can induce the breakage of C–F bonds via a reductive pathway. The combination of the mechanocaloric effect and the triple roles of alumina drives PFOA to a controlled defluorination. This MC process shows promising applications in the green treatment of PFOA solid wastes.
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ANALYTICAL CHEMISTRY
·
2013
·
IF 5.695
Hongmei Yang,Debin Wan,Fengrui Song,Zhiqiang Liu,Shuying Liu
Helium direct analysis in real time (He-DART) mass spectrometry (MS) analysis of labile compounds usually tends to be challenging because of the occurrence of prominent fragmentation, which obscures the assigning of an ion to an independent species or merely a fragment in a mixture. In the present work, argon DART (Ar-DART) MS in conjunction with makeup solvents has been demonstrated to analyze a variety of labile compounds including nucleosides, alkaloids, glucose, and other small molecules. The results presented here confirm that Ar-DART can generate significantly less energetic ions than conventional He-DART and is able to produce the intact molecular ions with little or no fragmentation in both positive and negative ion modes. Adding a makeup solvent (absolute ethyl alcohol, methanol, fluorobenzene, or acetone) to the argon gas stream at the exit of the DART ion source can result in 1–2 orders of magnitude increase in detection signals. The sensitivity attainable by Ar-DART was found to be comparable to that by He-DART. The investigation of influence of solvents improves our understanding of the fundamental desorption and ionization processes in DART. The practical application of this rapid and high throughput method is demonstrated by the successful analysis of a natural product (Crude Kusnezoff Monkshood) extract, demonstrating the great potential in mixture research.
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COMPOSITES SCIENCE AND TECHNOLOGY
·
2024
·
IF 8.3
Chengan Ma,Fei Yan,Shengtao Dai,Jintang Duan,Yuhui Ao,Gang Li,Gaosong Wang,Qingyu Zhou,Feng Bao,Liu Liu
In this study, a bio-based polyarylene ether ketone (bio-PAEK) was synthesized to prepare water-based sizing agents for enhancing the interfacial adhesion between carbon fiber (CF) and matrix. Thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC) results indicated that the bio-PAEK exhibited good thermal properties. To improve the processability and reduce the processing temperature, PAEK with a low melting point (LMPAEK) was also used as the matrix resin . The glass-transition temperature (T g ) of LMPAEK was slightly higher than that of polyether ether ketone (PEEK), but its melting temperature (T m ) was lower 48.5 °C. A strong interface was created after introducing sizing agents onto the CF surface due to good compatibility between fibers and matrix. The interlaminar shear strength (ILSS), interfacial shear strength (IFSS) and flexural strength of CF2/LMPAEK composites increased by 54.7 %, 56.0 % and 46.6 %, respectively, compared with the untreated composites. This study provided a novel approach to prepare water-based bio-PAEK sizing agents for CF composites with a low melting point matrix to be applied in additive manufacturing .
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Nature Chemistry
·
2024
·
IF 19.2
Ma Baochen,Zhang Haikuo,Li Ruhong,Zhang Shuoqing,Chen Long,Zhou Tao,Wang Jinze,Zhang Ruixin,Ding Shouhong,Xiao Xuezhang,Deng Tao,Chen Lixin,Fan Xiulin
Ideal rechargeable lithium battery electrolytes should promote the Faradaic reaction near the electrode surface while mitigating undesired side reactions. Yet, conventional electrolytes usually show sluggish kinetics and severe degradation due to their high desolvation energy and poor compatibility. Here we propose an electrolyte design strategy that overcomes the limitations associated with Li salt dissociation in non-coordinating solvents to enable fast, stable Li chemistries. The non-coordinating solvents are activated through favourable hydrogen bond interactions, specifically F δ− –H δ+ or H δ+ –O δ− , when blended with fluorinated benzenes or halide alkane compounds. These intermolecular interactions enable a dynamic Li + –solvent coordination process, thereby promoting the fast Li + reaction kinetics and suppressing electrode side reactions. Utilizing this molecular-docking electrolyte design strategy, we have developed 25 electrolytes that demonstrate high Li plating/stripping Coulombic efficiencies and promising capacity retentions in both full cells and pouch cells. This work supports the use of the molecular-docking solvation mechanism for designing electrolytes with fast Li + kinetics for high-voltage Li batteries.
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Nature Communications
·
2025
·Vol. 16
·期 1
·1-15
·
IF 15.7
Pan Hongji,Wang Tiantian,Jiang Yanxin,Ouyang Jingjing,Chen Lu,Wang Zeyi,Song Chunlei,Chen Nanshan,Yan Qing,Li Xin,Wu Shumin,Wang Tianshuai,Li Yiju
The localized high-concentration electrolyte based on the low-cost, low-density, low-viscosity, and low-fluorine-substitution fluorobenzene diluents and 1,2-dimethoxyethane solvents has been successfully demonstrated in high-performance lithium metal batteries. However, it requires high salt-to-solvent molar ratio, which causes high production costs and great environmental burden. Decreasing the salt-to-solvent molar ratio without sacrificing its electrochemical performance remains a challenge. Herein, we reveal that as the salt-to-solvent molar ratio is decreased, the compatibility of the fluorobenzene-diluted 1,2-dimethoxyethane-based electrolyte with lithium metals transitions from compatible to incompatible. We elucidate the degradation mechanism of the fluorobenzene-diluted 1,2-dimethoxyethane-based electrolyte undergoing severe side reactions with lithium metals. Inspired by these findings, we develop a fluorobenzene-diluted dimethyl acetal-based electrolyte, which enhances the stability of the electrolyte under a reduced lithium-salt concentration, making it show good compatibility with lithium metal (Coulombic efficiency: 99.43% at 25 °C, 97.74% at −40 °C). Moreover, the assembled Li | |SPAN battery displays a high capacity retention of 83% after cycling 500 cycles and can operate at −60 °C. Besides, a high specific energy of 334.53 Wh kg −1 (excluding package) can be achieved for the Li | |SPAN pouch cell. This work prompts us to re-examine the applicability of fluorobenzene as diluents in ether-based electrolytes for lithium metal batteries.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Timur Meng,Enhui Wang,Yuyue Peng,Zhiyi Li,Hongliang Lei,Saowaluk Chaleawlert-umpon,Hongmin Su,Youzhi Wang,Lina Li
Sulfur hexafluoride (SF 6 ), a crucial gas in the power and semiconductor industries, presents significant challenges for recovery and separation. This work reports the synthesis of a series of porous organic polymers (POPs) with high porosity and physicochemical stability via a Lewis acid-catalyzed slow-knitting method. Different fluorinated organic monomers were employed, using dibromomethane (DBrM) as both solvent and electrophilic cross-linker. The resulting DBrM-knitted POPs exhibited BET surface areas up to 1,408.37 m 2 /g, surpassing those of chloroform-knitted POPs by 53.51 %-160.26 %. These materials demonstrated superior SF 6 adsorption capacity, tunable via the position of fluorine groups. The optimal material achieved an SF 6 adsorption capacity of 91 ml/g at 273 K and an SF 6 /N 2 separation selectivity of 195.70. An optimal pore size of 0.73 nm was identified for SF 6 adsorption and separation. These findings contribute significantly to the development of advanced porous materials for efficient SF 6 recovery.
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DESALINATION
·
2025
·
IF 9.8
Yixin Ji,Zhongmin Su,Xiaochun Cui,Zhi Geng,Chi Wang
In recent years, nanofiltration (NF) membranes have garnered significant attention for water treatment and reuse applications, owing to their high separation efficiency, surface charge characteristics, and other advantages. However, the conventional support layer structures in NF membranes exhibit high permeation resistance, limiting their overall performance. To address this issue, an ideal through-hole structural support layer effectively minimizes resistance to water infiltration. The advent of advanced high-precision 3D printing technology facilitates the fabrication of such structures. In this study, a support layer with a straight-through pore structure was fabricated using advanced high-precision 3D printing technology, and the PES-COOH active layer was attached to the surface of the support layer via hydrogen bonding, resulting in the PES-COOH@3DP NF membrane. This innovation substantially reduced the permeation resistance, thereby enhancing the permeation flux of the NF process. The permeability of the PES-COOH@3DP NF membrane reached 6.64 L·m −2 ·h −1 ·bar −1 , which is double that of the PES-COOH@UF NF membrane. By incorporating varying concentrations of TiO 2 nanoparticles (0.5 %, 1 %, 1.5 %) into the photosensitive resin material, a hydrophilic support layer doped with TiO 2 nanoparticles was printed using a 3D printer. This improved the NF membrane's hydrophilicity, thereby enhancing its permeation flux. When the feed solution contained 1000 mg·L −1 Na 2 SO 4 , the [email protected] % TiO 2 3DP NF membrane exhibited a permeability of 8.56 L·m −2 ·h −1 ·bar −1 , 1.5 times that of the PES-COOH@UF NF membrane and 22 % higher than the commercial NF90 membrane, while retaining 98.76 % salt and demonstrating strong chlorine resistance. This study underscores the significant potential of advanced high-precision 3D printing technology, establishing it as a strong contender for next-generation NF membrane desalination development.
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CARBON
·
2025
·
IF 11.6
Yu Bai,Shengdao Wang,Guibin Wang,Yanxu Lu,Liubo Liang,Xiaohan Mei,Shiyu Wang,Chunqi Guo,Jianpeng Jiao,Xinyuan Shi,Shuling Zhang
With the rapid development of lightweight technologies and information systems, commercial polymer-based electromagnetic interference (EMI) shielding composites are increasingly inadequate for the complex structures and harsh operating conditions of aerospace electronic devices due to their corrosion sensitivity and low strength. Achieving high mechanical strength, EMI shielding effectiveness, and stable performance in harsh environments, such as high temperatures and corrosive media, remains a challenge. In this study, phenylacetylene groups were electrochemically grafted onto carbon nanotube (CNT) films to form phenylacetylene-grafted CNT (Ph-CNT), which was then combined with soluble phenylacetylene-capped ketimine polyetheretherketone (An-Ph-PEEK). Acidification of An-Ph-PEEK created crystalline phenylacetylene-capped PEEK (Ph-PEEK), and thermal crosslinking of phenylacetylene groups yielded crosslinked Ph-CNT/crystalline Ph-PEEK (cc@Ph-CNT/Ph-PEEK) composites. These composites exhibited high tensile strength (>240 MPa at 25 °C) and EMI shielding effectiveness (52–81 dB in the X-band across 25–250 °C), attributed to enhanced interfacial interactions and the stability of the crosslinked structure. The mechanical and EMI shielding properties were retained after prolonged exposure to corrosive media, thanks to the crystallinity of Ph-PEEK. Additionally, the composites exhibited photothermal antibacterial and electric de-icing capabilities. The high-performance cc@Ph-CNT/Ph-PEEK composites show promising potential for applications in harsh environments.
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CHINESE CHEMICAL LETTERS
·
2025
·
IF 8.9
Bin Wang,Qingqing Zhou,Junjie Lu,Chuyang Li,Mengmeng Fan,Wenwei Ding,Bifu Sheng,Wenjuan Zhu,Qian Ni,Huixin Chen,Xiang Han
Poly(vinylidene fluoride- co -hexafluoropropylene) (PVDF-HFP)-based solid polymer electrolytes show great potential for high energy lithium metal batteries, however, the residual solvent and related severe side reactions limit its development. Herein, a PVDF-HFP-based solid polymer electrolyte modified by fluorobenzene (FB) co-solvent is designed to address these problems. The introduced FB with weak solvation interaction regulates the coordination environment and induces anions to enter the solvation structure, generating more contact ion pairs (CIPs) and aggregates (AGGs). In addition, the anions-derived LiF-rich interphases help to improve the interface stability against Li metal. As a result, the FB-PVDF-HFP achieves high ionic conductivity (4.1 × 10 −4 S/cm) and low activation energy (0.125 eV) at room temperature. In addition, Li||Li symmetric cells using FB-PVDF-HFP electrolyte can achieve uniform and dendrite-free lithium deposition/stripping in the long-term cycling over 2300 h. The assembled solid-state Li|FB-PVDF-HFP|LFP full cell shows improved rate performance and cycling performance (600 cycles at 0.5 C and 450 cycles at 3 C) at room temperature. This work verifies the feasibility of fluorinated terminated solid polymer electrolytes on its lithium-ion transport and interfacial stability in lithium metal batteries.
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危险品化学品经营许可证（带存储）