POLYMER
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2021
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IF 4.43
Ziqin Li,Riming Yu,Chang Liu,Jifu Zheng,Jing Guo,Tauqir A. Sherazi,Shenghai Li,Suobo Zhang
The poly(aryl ether ketone) with spatial cardo structure is prepared from 4,4′-bis(phenoxy)benzophenone and 1-(4-bromobutyl)indoline-2,3-dione through a facile polyhydroxyalkylation reaction catalyzed by superacid . The number average molecular weight of the resultant polymer is achieved as high as 105.6 kg mmol −1 . Three anion exchange membranes were prepared by reacting the polymer with trimethylamine , N-methyl-piperidine, and N,N,N′,N′,N″-pentaethylguanidine, respectively. Among the prepared membranes, N-methyl-piperidine based anion exchange membrane exhibited the highest OH − conductivity of 99.8 mS cm −1 at corresponding IEC of 1.54 meq g −1 . In addition, the prepared membranes also exhibit excellent mechanical properties , in which the tensile strength and elongation at break can reach up to 50 MPa and 35%, respectively. Moreover, the anion exchange membranes exhibited good alkaline stability. When they were treated with 1 M KOH at 60 °C for 600 h, their conductivity decreased by less than 5%.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2023
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IF 4.2
Lili Gong,Zhili Cai,Can Wang,Ju Bai,Linglong Shan,Xianghai Meng,King Lun Yeung,Haitao Zhang,Zhichang Liu,Shuangjiang Luo
Superacid-catalyzed polymers of intrinsic microporosity have attracted increasing attention in membrane-mediated gas separation due to their good processability, facile polymerization procedure, and tunable microporosity and gas separation performance. In this study, we synthesized a series of new superacid-catalyzed polymers with fully ladder backbones and well-defined micropores using a one-pot condensation polymerization. The incorporation of a contorted spirobisindane building block facilitated the formation of highly microporous structures in the resulting polymers, enhancing their intrinsic microporosity and gas separation properties. Among the three SACPs, SACP-PhMe exhibited the largest d-spacing value, specific surface area, and pore volume due to its bulkiest side group. The gas separation performance of the SACP membranes surpassed several benchmark polymer membranes, with the SACP-PhMe membrane demonstrating excellent performance in separating CO2/CH4, H2/CH4, O2/N2, and H2/N2. The SACP-Me membrane exhibited the lowest porosity, making it less susceptible to CO2 absorption and showing superior plasticization resistance. The results highlight the promising gas separation properties of the SACPs and their potential for various gas separation applications, offering new opportunities for advanced polymer membrane design.
研究领域:
材料科学
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化学工程
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膜技术
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产品关联
DOI
高影响因子
FUEL
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2021
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IF 6.609
Zi-Fan Wu,Xian-Yong Wei,Wen-Long Mo,Yu-Hong Kang,Xiao-Qi Zhang,Xian-Kang Shan,Guang-Hui Liu,Xing Fan
TFMSA/ATA was prepared by impregnating trifluoromethanesulfonic acid (TFMSA) onto the acid-treated attapulgite (ATA). Yinggemajianfeng lignite was extracted ultrasonically with a mixed solvent obtain the extract and extraction residue (ER), and then ER was separated by density difference to obtain the light residue (LR). The non-catalytic hydroconversion (NCHC) and TFMSA/ATA-catalyzed hydroconversion of LR were investigated in cyclohexane at 160 °C under 4 MPa of initial hydrogen pressure for 12 h. The soluble portions from NCHC (SP NCHC ) and catalytic hydroconversion (SP CHC ) were analyzed with a Fourier transform infrared spectrometer and gas chromatograph/mass spectrometer. As a result, the yield of SP CHC (60.0%) is significantly higher than that of SP NCHC (1.8%), suggesting that the thermal dissolution of LR at 160 °C is negligible and TFMSA/ATA significantly catalyzed the hydrocracking of LR to release SP CHC . Oxygen-containing organic compounds, especially 4-methylpent-3-en-2-one and 4-hydroxy-4-methylpentan-2-one, are predominant produced from the CHC of LR, suggesting that the cleavage of > C α -O β - and > C β -O α - bonds in LR significantly proceeded during the CHC of LR over TFMSA/ATA. Such a mechanism was proved by the CHC of oxybis(methylene)dibenzene.
研究领域:
化学工程
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能源科学
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产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2021
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IF 8.742
Zhili Cai,Yitao Liu,Can Wang,Wei Xie,Yang Jiao,Linglong Shan,Peiyuan Gao,Haitao Wang,Shuangjiang Luo
Polymers of intrinsic microporosity have attracted comprehensive attention in membrane-mediated gas separation because of their rigid and contorted structure that facilitates well-defined microporosity for fast and selective gas transport. We report a new macromolecular design synthesizes semi-ladder and fully-ladder polymers of intrinsic microporosity containing 9H -xanthene units by superacid-catalyzed Friedel-Crafts polymerization named SACPs. The prepared SACP membranes display high microporosity with amorphous chain packing structure, high FFV, and high BET surfaces areas. In particular, SACP-3 exhibited the most elevated BET surfaces area of 568 m 2 /g, fractional free volume (FFV) of 0.243, and bimodal micropore size distribution with two maxima at ∼5 and ∼8 Å, respectively. Due to its fully ladder architecture, SACP-3 exhibits highly permeable gas transport with CO 2 permeability of 6497 Barrer and CO 2 /CH 4 selectivity of 7.8, respectively. The microporosity and gas permeation properties of SACP membranes are also demonstrated to be highly tailorable by employing different monomers . The facile polymerization procedure, excellent solubility and processability, highly diverse tunability, and outstanding gas separation performance render SACP membranes attractive for many membrane-mediated gas separation processes.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
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2019
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IF 5.383
Hong Yue Wu,Qian Yang,Xue Lang Gao,Zhao Yu Zhu,Qi Hui Sun,Qiu Gen Zhang,Ai Mei Zhu,Qing Lin Liu
To enhance the performance of anion exchange membranes (AEMs) by constructing effective ion channels, we synthesized novel aliphatic polymers with pentafluorophenyl pendent groups via superacid catalyzed polyhydroxyalkylation and quaternization by grafting multi-cation crosslinker through the Menshutkin reaction . The procedure adopted in this study for preparing the AEMs circumvented the utilization of precious metal catalysts and made it easy to control the reaction conditions. Compared with the traditional aliphatic AEMs, the AEMs prepared by the new strategy exhibited well-developed microphase-separated structures by increasing the hydrophilic/hydrophobic difference between the polymer backbones and the side chains. Moreover, the multi-cation crosslinker not only provides ion exchange groups but also constrains the swelling of the AEMs. As we expected, the well-defined ion channels were validated by transmission electron microscopy (TEM) and small angle X-ray scattering (SAXS). The CPFBP-TQA-100 membrane shows a highest ion conductivity of 76.85 mS cm −1 and a swelling ratio of only 24.8% at 80 °C. A maximum power density of 116.7 mW cm −2 is achieved by a single cell using the CPFBP-TQA-100 membrane at a current density of 300 mA cm −2 at 80 °C. Besides, all the AEMs display excellent thermal stability and reasonable alkaline stability.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
Sustainable Chemistry and Pharmacy
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2024
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IF 5.5
Zijun Feng,Xiaochun Zhang,Yan Wang,Haoran Yu,Zhice Xu,Jianying Wang
A strategy for efficiently conversion waste polystyrene foam into hypercrosslinked polymers (HCPs) used for VOCs adsorption has been developed. Superacid CF 3 SO 3 H was used as a highly active metal-free catalyst, which greatly shortened the preparation and purification time of HCPs. The prepared HCPs were characterized by N 2 adsorption-desorption, SEM, TEM, TGA, FTIR, 13 C solid-state NMR, XPS and EDS. The obtained HCPs showed good adsorption performance for monocyclic aromatic hydrocarbons. Among all the prepared HCPs, HCP-0.5 displayed the best adsorption capability (O-xylene: 422 mg/g, toluene: 283 mg/g, benzene: 116 mg/g), good hydrophobicity and reusability. The adsorption properties of these low-cost HCPs surpassed current popular nanoporous materials such as metal organic frameworks (MOFs), porous clay heterostructures (PCH) and other HCPs, indicating their potential applications as valuable adsorbent for removal of VOCs. Additionally, the interaction between aromatic pollutants and HCP was simulated by quantum chemistry calculation. The adsorption process of three aromatics VOCs on HCP-0.5 were more in accordance with the pseudo-first order kinetic model and Freundlich isotherm model, indicating that the adsorption process was dominated by multilayer physical adsorption. Weber-Morris kinetic model was used to illustrate the rate-controlling mechanism, and the results indicated that the intra-particle diffusion was the control stage of adsorption rate.
研究领域:
材料科学
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环境科学
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化学工程
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产品关联
DOI
高影响因子
Advanced Membranes
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2024
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IF 0
Yuan Gao,Zhihao Huang,Wenyue Lv,Hua Zhang,Yuanqing Ye,Rongfei Zhou,Huiyun Liao,Haoli Zhou,Wanqin Jin
Superacid catalysis, a suitable method for the synthesis of membrane materials owing to its facile polymerization procedure, has been extensively studied. However, superacid-catalyzed binary coplanar polymer membranes generally exhibit low permeabilities. In this study, a rigid 3D triptycene-based polymer was synthesized by the superacid catalysis of triptycene with trifluoroacetophenone and diphenyl ether to enhance membrane permeability for the molecular sieving of nitrogen over volatile organic compound (VOC). The synthesis of polymers with (CF 3 PhET) or without triptycene (CF 3 PhE) was investigated using different characterizations. The triptycene content of the synthesized polymers was optimized based on an analysis of the molecular weight, membrane-forming properties, and separation performance. The separation performances of membranes fabricated using CF 3 PhE, CF 3 PhET, and a mixture of CF 3 PhE and triptycene were compared. Results showed that the introduction of non-coplanar triptycene in the membrane can increase permeability by nearly 60 times due to the enhanced free volume, from 30 Barrer for the CF 3 PhE membrane to 1755 Barrer for the membrane with 5 mol% triptycene content for the separation of a 3 mol% nitrogen/cyclohexane mixture at 1 L/(m 2 ·min). Furthermore, the rejection remains constant, which provides an effective idea for the synthesis of membrane materials with high performance using superacid catalysis.
研究领域:
高分子化学
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膜分离技术
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材料科学
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化学工程
✓ 已验证
DOI
ACS Applied Energy Materials
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2022
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IF 6.959
Zhi Hong Cai,Xue Lang Gao,Wei Ting Gao,Yvonne Shuen Lann Choo,Jia Jun Wang,Qiu Gen Zhang,Ai Mei Zhu,Qing Lin Liu
In recent years, with the continuous application of superacid-catalyzed condensation reaction in the preparation of anion exchange membranes (AEMs), a number of AEMs with excellent performance have been designed. Among them, the method to copolymerize two aromatic compounds with piperidone via a superacid-catalyzed reaction to synthesize anionic conducting copolymers has been widely discussed by researchers. Here, we focus on the introduction of poly(N-alkylcarbazole-co-terphenyl N,N′-dimethylpiperidinium) (PCTP-n), which is formed by copolymerizing different chain lengths of N-alkylcarbazole (AHC, n = 2, 4, and 6) and p-terphenyl with 1-methyl-4-piperidone (1M4P). As a result of the high-curvature backbone and hydrophobic flexible side chains, the PCTP-n AEMs show comprehensive performance advantage. Among them, the PCTP-6 membrane, with an ultralow swelling (7.9%) and an excellent OH– conductivity retention (91.9% in 2 M NaOH at 80 °C after 1080 h), highlights high dimensional stability and alkaline resistance. Then, the PCTP-2 membrane displays excellent mechanical robustness (EB: 40%, TS: 20 MPa) and a decent OH– conductivity (134 mS cm–1 at 80 °C). Furthermore, the PCTP-2-based single cell exhibits a decent power density of 542 mW cm–2 under H2–O2 condition.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
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2024
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IF 4.3
YanXiao Zhang,XiaoNing Gao,Nan Ma,Hong Zhou,Lu Feng
Diosgenin is an indispensable intermediate in the production of various steroid drugs. Conventional hydrolysis of sulfuric acid produces large amounts of acidic wastewater and has always faced stringent restrictions from environmental requirements. Here, UiO-66-NH 2 and its derivative of UiO-66-NH 2 -AT (AT = 3-amino-1,2,4-triazole) were synthesized, and these two compounds were further grafted with high-concentration CF 3 SO 3 H molecules to obtain the MOF-based solid superacids, namely UiO-66-NH 2 -[SO 3 CF 3 ] and UiO-66-NH 2 -AT-[SO 3 CF 3 ], respectively. They have been applied to the alcoholysis of total saponins to extract diosgenin, and the alcoholysis conditions, including the solid acid dosage, extraction temperature and extraction time, have been optimized by single-factor experiments. Subsequently, the alcoholysis conditions of UiO-66-NH 2 -AT-[SO 3 CF 3 ] with more prominent catalytic performance and cycle stability were further optimized by the response surface method, and under the optimum conditions, the diosgenin yield reached 20.8 %, which was close to the predicted value of 21.3 % and was superior to the conventional hydrolysis of sulfuric acid and our previously reported solid acids. Additionally, the alcoholysis pathways and alcoholysis mechanism of the total saponins catalyzed by UiO-66-NH 2 -AT-[SO 3 CF 3 ] have been proposed by the analysis of high-resolution electrospray mass spectrometry.
研究领域:
化学工程
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药物化学
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环境科学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）