JOURNAL OF MOLECULAR STRUCTURE
·
2022
·
IF 3.841
Jing Su,Liuyang Wang,Qixin Lu,Min Li,Yu Guan,Chunxia Wang,Shaohai Fu
Dyes containing cyano group have the advantages of bright colours and high molar absorption. However, most cyano-containing disperse dyes are not used for alkaline dyeing as they are easily hydrolysed under alkali conditions. Herein, cyano-containing disperse dyes for alkaline dyeing were designed by introducing non-hydrolysable phenylethyl and potentially alkali-hydrolysable ethyl benzoate in adjacent positions to the cyano group, and the effect of the adjacent groups on the alkali resistance of cyano-containing dyes was investigated. Polyester fabric (PET) was dyed under different acidic or alkali conditions by the disperse dyes, then the hydrolysis energy barrier of cyano on the dye and the binding energy of dye-dye and dye-PET under the dyeing conditions were calculated via Density Functional Theory (DFT). The results showed that the cyano-containing disperse dyes with an adjacent benzene ring structure had good alkali resistance in a 5 g/L NaOH dye bath. DFT simulations confirmed that the adjacent phenylethyl did not have a significant effect on the hydrolytic energy barrier of the cyano group, while the adjacent ethyl benzoate reduced the hydrolytic energy barrier of the cyano group. The introduction of an adjacent benzene ring reduced the dye-dye binding energy, contributing to the increasement of dyeing rate at the beginning of the dyeing process. The designed cyano-containing dyes with adjacent benzene rings achieved a colour fastness level of 4–5 or above in various acid and alkali conditions.
研究领域:
化学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Chemistry
·
2025
·
IF 14.9
Yingjie Liu,Xibin Yue,Yongqi Hu,Hui Peng,Guoliang Zhang,Aimei Zhu,Qiugen Zhang,Qinglin Liu
Improving the comprehensive performance of anion exchange membranes (AEMs) has a decisive impact on the wide application of anion exchange membrane fuel cells (AEMFCs). Herein, we prepared a series of new poly(phenanthrene-co-p-terphenyl piperidinium) (PPTP3F x -DIL) AEMs with different fluorinated monomers for high performance AEMFCs. The polymerization of fluorinated monomers with other aryl monomers can effectively promote the separation of microphase in the membrane. It also has a high OH − conductivity at a low swelling. The membrane (PPTP3F 4 -DIL) prepared by polycondensation of 2,2,2-trifluoro-1-(p-tolyl)ethan 1-one monomer achieves a high conductivity of 168.5 mS cm −1 at 80 °C. At the same time, the water uptake is 40.0% and the swelling ratio is 12.1%. In addition, these membranes also have good mechanical properties and alkaline stability. After 1440 h of treatment in a NaOH (2 M) solution at 80 °C, PPTP3F x -DIL still maintains excellent tensile strength (>30.3 MPa) and elongation at break (>43.4%), and the conductivity retention of the PPTP3F 1 -DIL membrane is 90.3%. The PPTP3F 4 -DIL-based single cell exhibits a high peak power density (918.1 mW cm −2 ) and excellent durability (100 h) at 80 °C. Therefore, these PPTP3F x -DIL membranes have a wide range of applications in AEMFCs.
研究领域:
材料科学
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能源技术
✓ 已验证
产品关联
DOI
高影响因子
Green Energy & Environment
·
2024
·
IF 10.7
Ke Shi,Hongyi Wan,Keyu Wang,Fumohan Fang,Shiyi Li,Yixing Wang,Linfeng Lei,Linzhou Zhuang,Zhi Xu
Seawater electrolysis for hydrogen production faces inherent challenges, including side reactions, corrosion, and scaling, stemming from the intricate composition of seawater. In response, researchers have turned to continuous water splitting using forward osmosis (FO)-driven seawater desalination. However, the necessity of a neutral electrolyte hampers this strategy due to the limited current density and scarcity of precious metals. Herein, this study applies alkali-durable FO membranes to enable self-sustaining seawater splitting, which can selective withdraw water molecules, from seawater, via concentration gradient. The membranes demonstrated outstanding perm-selectivity of water/ions (∼5830 mol mol −1 ) during month-long alkaline resistance tests, preventing electrolyte leaching (>97% OH − retention) while maintaining ∼95% water balance ( V FO = V electrolysis ) via preserved concentration gradient for consistent forward-osmosis influx of water molecules. With the consistent electrolyte environment protected by the polyamide FO membranes, the NiFe-Ar-P catalyst exhibits promising performance: a sustain current density of 360 mA cm −2 maintained at the cell voltage of 2.10 V and 2.15 V for 360 h in the offshore seawater, preventing Cl/Br corrosion (98% rejection) and Mg/Ca passivation (99.6% rejection). This research marks a significant advancement towards efficient and durable seawater-based hydrogen production.
研究领域:
能源科学
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材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2018
·Vol. 6
·期 48
·24831-24840
·
IF 9.931
Ling Li,Qian Yang,Xue Lang Gao,Hong Yue Wu,Qiu Gen Zhang,Ai Mei Zhu,Qing Lin Liu
With the aim of preparing highly alkaline stable anion-exchange membranes (AEMs) with desirable ionic exchange capacity (IEC) and swelling, a series of crosslinked poly(4-vinylphenol) (PVP)-based membranes was prepared. A facile crosslinking method using bis(hydroxymethyl)-4-cresol (BHMC) as the crosslinker was introduced in the preparation of AEMs to avoid sacrificing specific functional groups such as –OH in the backbone. It is worth mentioning that the whole procedure for membrane preparation was efficient and easy to handle. The as-prepared membranes exhibited pretty low water uptake and swelling by the introduction of a crosslinked structure. Microphase separation to different extents could be observed in the membranes with different degrees of crosslinking via transmission electron microscopy (TEM) and small angle X-ray scattering (SAXS). The QAPVP-5% membrane with an ionic exchange capacity (IEC) of 2.12 meq g−1 displayed the highest ionic conductivity of 78 mS cm−1 at 80 °C. Moreover, the all-carbon backbone endowed an excellent alkaline stability of the membranes, and the QAPVP-5% membrane still retained 91.3% of its original conductivity after immersing in a 2 M aqueous KOH solution at 80 °C for 480 h. A peak power density of 122 mW cm−2 was also obtained by a single cell equipped with the QAPVP-5% membrane.
研究领域:
材料科学
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化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION
·
2024
·Vol. 39
·期 1
·82-90
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IF 1.3
Chen Meihua,Liu Rongjin,Chen Ping,Jing Daiyan,Wan Dandan,Fu Siyuan
Internal curing agents (ICA) based on super absorbent polymer have poor alkali tolerance and reduce the early strength of concrete. An alkali tolerate internal curing agent (CAA-ICA) was designed and prepared by using sodium carboxymethyl starch (CMS) with high hydrophilicity, acrylic acid (AA) containing anionic carboxylic group and acrylamide (AM) containing non-ionic amide group as the main raw materials. The results show that the ratio of CAA-ICA alkali absorption solution is higher than that existing ICA, which solves the low water absorption ratio of the ICA in alkali environment. The water absorption ratio of CAA-ICA in saturated Ca(OH) 2 solution is 95.8 g·g −1 , and the alkali tolerance coefficient is 3.4. The application of CAA-ICA in cement-based materials can increase the internal relative humidity and miniaturize the pore structure. The compressive strength of mortar increases up to 12.95% at 28 d, which provids a solution to overcome the reduction of the early strength.
研究领域:
土木工程
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材料科学
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建筑材料
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高分子科学
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2025
·
IF 9.7
Shuo-Chun Ke,Xue-Xia Guo,Fangang Meng,Yuanyuan Zhang,Yu-Xi Huang
Conventional polyamide (PA) nanofiltration membranes suffer from poor chemical tolerance, being particularly susceptible to degradation in alkaline and chlorine-containing environments. This inherent nature leads to membrane performance deterioration, severely limiting their practical applications. To overcome these limitations, we developed a surface-enhanced crosslinking strategy involving the sequential grafting of ethylenediamine (EDA) and polyacrylic acid (PAA) onto a piperazine-trimesoyl chloride (PIP-TMC) polyamide layer. The modified IP-EDA/PAA membrane demonstrated altered surface zeta potential, reduced pore size distribution, and a more compact functional layer structure, resulting in both excellent nanofiltration performance and remarkable long-term stability under harsh chlorine and alkaline conditions. The surface-enhanced crosslinking could eliminate the chlorination-active sites through molecular grafting and capping. Besides, the crosslinking also endowed the active layer with improved mechanical stability, enhanced electrostatic repulsion effects, and a sacrificial protection layer. Therefore, the IP-EDA/PAA membrane maintained a rejection rate of ~86.8 % for Na 2 SO 4 following 5-day immersion in a pH 13 NaOH solution and retained ~93.8 % rejection after cumulative chlorine exposure of 80,000 ppm·h (1000 ppm for 80 h). This work successfully demonstrated the design and fabrication of a robust nanofiltration membrane with excellent alkali- and chlorine-resistance.
研究领域:
膜科学
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材料化学
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化学工程
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表面改性
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水处理技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2025
·
IF 9
Zilin Zhao,Wangxi Fang,Youcai Chen,Shoujian Gao,Yuzhang Zhu,Jian Jin
Lignin, the second most abundant biomass resource, is widely utilized across various industries. Lye extraction is a prevalent approach for extracting lignin, but it needs to consume a lot of acid to neutralize the lye and precipitate the lignin products, resulting in a tremendous waste of acid and alkali. Direct separation of lignin and lye through nanofiltration technology can significantly reduce the consumption of acid and alkali. However, the development of nanofiltration membranes with sufficient alkali resistance for processing lignin and lye remains a challenge. Herein, we report the fabrication of polytertiary amine (PTA) nanofiltration membranes with exceptional alkali resistance via interfacial polymerization of piperazine and 1,3,5-tris-bromomethyl-benzene. PTA membranes maintained stable nanofiltration performance after immersion in alkaline solutions for 30 days and exhibited nearly unchanged lignin rejection even in NaOH solutions with concentrations of up to 5 mol L −1 . During the separation of lignin and lye, PTA membranes demonstrated high lignin rejection of 95 % and low NaOH rejection below 15 %, along with a high water permeance of 14 L m −2 h −1 bar −1 . Quantitative lignin/lye separation using the PTA membrane achieved 80 % recovery of the lye with a NaOH purity of 98.4 %, simultaneously concentrating the lignin sixfold. This work opens a new approach to developing durable nanofiltration membranes for sustainable lignin extraction and separation applications in alkaline environments.
研究领域:
膜科学
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化学工程
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材料科学
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环境工程
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高分子化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Wenjing Xue,Dong Yan,Guoqiang Han,Wande Ding,Kefeng Zhang,Qianwen Zhang
The inherent hydrophobicity of polyvinylidene fluoride (PVDF) ultrafiltration (UF) membranes exacerbates fouling and limits separation efficiency. To address this, copolymerized poly(vinylidene fluoride- co -acrylic acid) (p(VDF-co-AA)) membranes were fabricated through tert-amyl peroxyneodecanoate (TBPP)-initiated in situ carboxyl group grafting. NMR and XPS verified carboxyl incorporation, while SEM and AFM revealed pore structure refinement (38.44 nm average pore diameter) and increased surface roughness (Ra: increased from 22.7 nm for PVDF membrane to 40.1 nm for p(VDF-co-AA 1.5wt% )). These structural enhancements elevated hydrophilicity, reducing water contact angle by 37.9 % (from 76.65 o ± 2.16 for PVDF membrane. decreased to 47.64 o ± 0.66 for p(VDF-co-AA 1.5wt% )) and tripling pure water permeance to 617 L·m −2 ·h −1 ·bar −1 . Molecular dynamics simulations revealed that synergistic hydrogen bonding and carboxyl polar interactions dominated hydrophilicity enhancement. The modified membranes demonstrated outstanding antifouling performance against humic acid (HA), bovine serum albumin (BSA), and sodium alginate (SA), achieving 28.0–38.8 % higher flux retention (J/J 0 ) and 16.7–50.1 % lower irreversible fouling. Notably, the incorporation of carboxyl groups facilitated stable separation performance under extreme alkaline conditions (pH = 14), retaining over 87.6 % of the initial flux and 69.10 % DOC rejection after a 3-day exposure period. This study provides a robust strategy for the development of high-performance UF membranes through molecular-scale hydrophilicity engineering.
研究领域:
膜科学
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高分子化学
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材料科学
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环境工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Coatings Technology and Research
·
2023
·Vol. 21
·期 1
·341-354
·
IF 2.3
Zhang Xueke,Chen Kaimin,Li Ziwei,Zhang Qianqian,Xu Chenming,Chang Yue,Wen Shaoguo
Cationic polyacrylate latex has attracted extensive attention due to its special properties and potential applications in wood primers, metal coatings, and fabric treatments, etc. However, cationic polyacrylate latex has poor durability and stability, which limits its use in practical applications. In this study, a functional cationic monomer (3-chloro-2-hydroxypropyl) dimethyl [2-[(2-methyl-1-oxoallyl)oxy]ethyl] ammonium chloride (DEAC) was combined with two conventional monomers of methyl methacrylate (MMA) and butyl acrylate (BA) to prepare cationic polyacrylate latex by a semi-continuous emulsion polymerization. The obtained latexes showed typical cationic character with zeta potential in the range of + 40 to + 65 mV. The effect of DEAC on the stability of latex was studied and good alkali resistance could be gained at high DEAC content. Water resistance and mechanical properties of the film before and after crosslinking are studied in detail. The results showed that the water absorption reduced from 60.04% to a minimum of 9.18%, and the tensile strength increased from 3.9 to 8.4 MPa, which was comparable to solvent-based polyacrylate films. This work provides a new strategy for the preparation of waterborne cationic polyacrylate latex with improved water resistance and good mechanical properties, etc., which can be applied in papermaking, textiles, wood primers, and other potential fields. Graphical abstract
研究领域:
高分子科学
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材料工程
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化学合成
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涂料技术
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表面化学
✓ 已验证
DOI
高影响因子
EUROPEAN POLYMER JOURNAL
·
2021
·
IF 4.598
Na Yu,Jianhao Dong,Huanhuan Li,Tingting Wang,Jingshuai Yang
Polystyrene- b -poly(ethylene-co-butylene)- b -polystyrene (SEBS) has attracted more and more attention recently for using as the matrix of anion exchange membranes (AEMs) in fuel cells due to its low cost, superior mechanical properties and ether-free total C-C bond backbone. In this work, the short side chain of chloromethyl and long side chain of bromohexanoyl groups are grafted into the SEBS copolymer via the chloromethylation and Friedel-Crafts acylation reactions. After quaternized by different nitrogen heterocyclic compounds including 1-methylimidazole (Im), 1-methylpyrrolidine (Mpy), N -methylpiperidine (Pip) and 2-methyl-1-pyrroline (Mpyl), various SEBSC n - x AEMs are prepared. Combing with small molecule model experiment results, Mpy and Pip cations grafted SEBS membranes are confirmed to possess good alkali resistance, while SEBSC1- x membranes with Im and Mpyl cations are not suitable for AEMs due to their poor alkaline stability. Meanwhile, long side-chain cation grafted SEBSC6- x AEMs with lower ion exchange capacity (IEC) values exhibit higher water uptake, ionic conductivity and mechanical strength simultaneously comparing with short side-chain cation grafted SEBSC1- x AEMs. As an example, the SEBSC6-Pip membrane with an IEC of 0.48 mmol g −1 exhibits a water uptake of 47% at 80 °C, an OH − conductivity of 57.7 mS cm −1 at 80 °C, a tensile strength of 52 MPa at room temperature, and a conductivity retention percent of 75% after 600 h in 1 M KOH at 80 °C, demonstrating a big potential for the AEM fuel cell application.
研究领域:
高分子科学
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膜技术
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燃料电池
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材料科学
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2019
·
IF 7.015
Kaifeng Wang,Li Gao,Jiafei Liu,Xiangdong Su,Xiaoming Yan,Yan Dai,Xiaobin Jiang,Xuemei Wu,Gaohong He
High-conductive and alkali-resistant alkaline membranes are needed for fuel cells and water electrolysis. In this work, the ether-free poly(biphenyl indole) (PBN) was synthesized by the means of super acid catalysis . Then comb-shaped piperidinium-functionalized PBN (PBN-Pip) membranes were prepared by the incorporations of 1-bromohexyl- N -methylpiperidinium and 1-bromohexane. The comb-shaped long side chains facilitated the formation of wide and connected ion transport channels. The PBN-Pip membrane possessed the conductivity of as high as 108 mS cm −1 at 80 °C. The ether-free backbone and the hexyl spacers endowed the membrane with excellent stability. No degradation can be observed after immersion in 1 M KOH at 80 °C for 1000 h. The single cell with this membrane exhibited the open circuit voltage of 1.02 V and the peak energy density of 404 mW cm −2 at 80 °C. After the cell durability test for 120 h, the ohmic resistance of the cell and the chemical structure of the membrane both had no changes. All these suggest that the comb-shaped PBN membrane is very promising.
研究领域:
材料科学
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电化学
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能源技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）