MACROMOLECULAR MATERIALS AND ENGINEERING
·
2018
·Vol. 303
·期 3
·1700462
·
IF 2.69
Chao Wang,Zhenfeng He,Xiaofeng Xie,Xianmin Mai,Yingchun Li,Tingxi Li,Min Zhao,Chao Yan,Hu Liu,Evan K. Wujcik,Zhanhu Guo
A new monomer called 2,2′-(4,4′-oxydiphenol-4,4′-diyl)bis(2-methyl-2,3,3a,4,7,7a-hexahydro-1H-4,7-methanoisoindol-2-ium) iodide (d 3 ) is synthesized possessing both cross-linker and functional groups. The membranes are formed by copolymerizing d 3 with norbornene and (3aR,4S,7R,7aS)-2-methyl-2-(3-(trimethylammonio)propyl)-2,3,3a,4,7,7a-hexahydro-1H-4,7-methanoisoindol-2-ium iodide (a 3 ) at varying ratios. The water uptake is 41.35% at 60 °C, and ion exchange capacity is 2.35 mequiv g −1 for a mole ratio of a 3 , norbornene, and d 3 (1:6:3). The conductivity is 12, 37, and 40 mS cm −1 when d 3 is decreased. Meanwhile, the conductivity increases quickly with increasing the temperature. Furthermore, the mechanical properties and thermal properties are improved, attributed to the increased cross-linker. The membrane has a tensile strength of 41.3 MPa and the elongation at break of 38.0 %, and the 5 wt% loss temperature for membrane is ≈159 °C. The H 2 /O 2 single fuel cells with this membrane show a maximum power density of 124 mW cm −2 at 50 °C. The cross-linked membranes demonstrate high-dimensional stability in alkaline solution.
研究领域:
材料科学
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能源科学
✓ 已验证
DOI
高影响因子
REACTIVE & FUNCTIONAL POLYMERS
·
2019
·
IF 3.074
Xing Yang,Yayun Zheng,Lan Wang,Qingping Guo,Haiquan Shan,Zongxiang Xu,Jujie Luo
This work involves the preparation and characterization of poly(styrene-b-isoprene-b-styrene)-poly(dimethylsiloxane- co -methylhydrosiloxane) (SIS-c-PDMS-co-PMHS) crosslinked membranes towards CH 4 /N 2 separation. SIS-c-PDMS-co-PMHS was synthesized via a simple hydrosilylation reaction with various PDMS-co-PMHS contents. The structure of crosslinked membranes was investigated by Fourier transform infrared spectroscopy , indicating the degree of hydrosilylation reaction. The morphology of sample membranes was observed in detail by means of Scanning Electron Microscope analysis . Thermodynamic stability and the crosslinked behavior of crosslinked membranes were explored by thermogravimetric analysis and Soxhlet extraction experiments. Furthermore, single gas (CH 4 , N 2 ) permeability was measured using the time-lag method. The CH 4 permeability of crosslinked membranes with 70 wt% PDMS-co-PMHS could reach 503 Barrer at 25 °C and 1 bar, which is significantly greater than that of SIS (25.9 Barrer), while the CH 4 /N 2 ideal selectivity hardly changed. Notably, CH 4 permeability further improved by 77.6% (893.4 Barrer) as the temperature increased to 55 °C. For the CH 4 /N 2 (50/50 vol%) mixed gas, the SIS-c-PDMS-co-PMHS-70 sample membrane exhibited ideal gas separation performance relative to that of the pure SIS membrane (CH 4 : 447.4 vs. 24.2 Barrer，N 2 : 188.1 vs. 9.46 Barrer).
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
JOURNAL OF POWER SOURCES
·
2013
·
IF 4.675
Hao Jiang,Xin Guo,Gang Zhang,Jing Ni,Chengji Zhao,Zhongguo Liu,Liyuan Zhang,Mingyu Li,Shuai Xu,Hui Na
In this paper, a series of proton exchange membranes prepared by “Click Reaction” are reported. The cross-linked membranes are based on water soluble sulfonated poly (ether ether ketone) containing dipropenyl groups (SDPEEK-nE/nH). Compared with self-crosslinked membranes (SDPEEK-nS), this “Click” cross-linked membranes using 1,2-Ethanedithiol and 1,6-Hexanedithiol as the cross-linker exhibit extremely reduced water uptake and swelling ratio. The lowest proton conductivity at 80 °C of the “Click” cross-linked membranes reaches to 0.168 S cm −1 , and the highest methanol permeability of the “Click” cross-linked SDPEEK-8E is only 4.13 × 10 −7 cm 2 s −1 , which is 5 times lower than that of Nafion 117 membrane. All the results imply that the cross-linked membranes with novel thiol cross-linker are promising alternative material for fuel cell application .
研究领域:
材料科学
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能源工程
✓ 已验证
产品关联
DOI
高影响因子
Nanomaterials
·
2023
·Vol. 13
·期 2
·266
·
IF 5.3
Erli Qu,Min Xiao,Dongmei Han,Sheng Huang,Zhiheng Huang,Wei Liu,Shuanjin Wang,Yuezhong Meng
A semi-aromatic polybenzimidazole (DPBI) is synthesized via polycondensation of decanedioic acid (DCDA) and 3,3-diaminobenzidine (DAB) in a mixed phosphorus pentoxide/methanesulfonic acid (PPMA) solvent. Ascribing to in-situ macromolecular crosslinker of ploly((vinylbenzyl chloride) (PVBC), a robust crosslinked DPBI membrane (DPBI-xPVBC,xrefers to the weight percentage of PVBC in the membrane) can be obtained. Comprehensive properties of the DPBI and DPBI-xPVBC membranes are investigated, including chemical structure, antioxidant stability, mechanical strength, PA uptake and electrochemical performances. Compared with pristine DPBI membrane, the PA doped DPBI-xPVBC membranes exhibit excellent antioxidative stability, high proton conductivity and enhanced mechanical strength. The PA doped DPBI-10PVBC membrane shows a proton conductivity of 49 mS cm−1at 160 °C without humidification. Particularly, it reveals an enhanced H2/O2single cell performance with the maximum peak power density of 405 mW cm−2, which is 29% higher than that of pristine DPBI membrane (314 mW cm−2). In addition, the cell is very stable in 50 h, indicating the in-situ crosslinked DPBI with a macromolecular crosslinker of PVBC is an efficient way to improve the overall performance of HT-PEMs for high performance HT-PEMFCs.Keywords:polybenzimidazole;crosslinked membrane;high temperature proton exchange membrane;high temperature fuel cell
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2018
·
IF 3.909
Jie Li,Bing Xie,Kai Xia,Chunmao Zhao,Yingchun Li,Dong Li,Jing Han
Novel cross-linked chitosan quaternary ammonium salt (CHACC) membranes were successfully prepared by the reaction of chitosan quaternary ammonium salt (HACC) and epichlorohydrin. The structures and morphologies of the CHACC membranes were characterized. The water stability and antibacterial efficiency of CHACC membranes were investigated by the equilibrium swelling method, the plate count method and minimum inhibitory concentration (MIC) test, respectively. Further, an antibacterial piezoelectric sensor with a multilayered structure was prepared by attaching the CHACC membrane to a poly(vinylidenefluoride‑ co ‑trifluoroethylene) (PVDF-TrFE) based sensor. The piezoelectrical properties of PVDF-TrFE based sensors coated with CHACC were investigated. The results showed that the CHACC-4 with a three-dimensional network structure exhibited best water stability (193% of swelling degree) and antibacterial properties (antibacterial rate > 99%), and the MIC of CHACC against E. coli , S. aureus and P. aeruginosa was 40, 320 and 640 μg/mL, respectively. Additionally, the coating of CHACC-4 had no adverse effect on the piezoelectric properties of the prepared sensor. The fabricated multilayer sensor has potential applications in the field of wearable devices.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2017
·Vol. 7
·期 49
·30770-30783
·
IF 3.108
Qian Shi,Pei Chen,Jinfang Zhou,Qiang Weng,Xueliang Zhang,Xinbing Chen,Zhongwei An
A new difluoro aromatic ketone monomer, (2,6-difluorophenyl)[3,5-bis[(3,5-dimethylphenyl)methyl]phenyl]methanone, is developed to prepare a series of poly(arylene ether sulfone)s (PAES) bearing two pendant 3,5-dimethylphenyl groups via polycondensation reaction. The desired side-chain type PAESs containing multiple benzyl quaternary ammonium groups (QPAES(x/y)) are obtained by the corresponding bromomethylation and subsequent quaternization. Their properties, such as hydroxide conductivity, dimensional change, water uptake and alkaline stability, are investigated. Side-chain type membranes QPAES(x/y) with ion exchange capacities (IECs) of 0.96–1.22 mequiv. g−1 display anisotropic membrane swelling and hydroxide conductivity of 39.9–49.8 mS cm−1 at 80 °C. The greater length and dense distribution of the benzyl-type quaternary ammonium pendants are probably responsible for the good hydroxide conductivity and alkaline stability. Meanwhile, the corresponding crosslinked membrane (CQPAES(1/4)) shows higher conductivity, lower membrane swelling, better oxidative stability and higher chemical stability in hot alkali solution (80 °C) than the uncrosslinked one with a comparable IEC value.
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
ELECTROCHIMICA ACTA
·
2018
·
IF 5.116
Hai Qiang Li,Xue Jiao Liu,Huiyun Yang,Zhe Wang,Jin He
Herein, we demonstrate the fabrication of cross-linked membranes based on sulfonated poly(arylene ether ketone sulfone) containing pendant amino groups (AM-SPAEKS) and triazole-grafted 3-Glycidyloxypropyltrimethoxysilane (GT) cross-linkers by a sol-gel process, then the obtained cross-linked membranes are named as AMSP/GT membranes. The GT cross-linkers are synthesized by the ring-opening reaction of the epoxy group and 3-amino-1,2,4-triazole. The AMSP/GT cross-linked membranes exhibit excellent thermal, oxidation and dimensional stability. Furthermore, the AMSP/GT membranes possess a low methanol permeability coefficient (9.95 × 10 −7 cm 2 s −1 at 60 °C) due to the formation of cross-linked network structures. In addition, the proton conductivity and relative selectivity of the AMSP/GT membranes are higher, at elevated temperatures (>80 °C), than AM-SPAEKS membranes. The highest proton conductivity of 0.135 S cm −1 is demonstrated, for the AMSP/GT-30 membrane, at 100 °C. The relative selectivity of AMSP/GT-30 can reach 7.54 × 10 4 S scm −3 which is three times higher than that of the AM-SPAEKS, at 60 °C. These results indicate that the AMSP/GT membranes can be promising candidates for practical applications such as proton exchange fuel cells etc.
研究领域:
材料科学
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能源科学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2011
·
IF 4.057
Pei Chen,Xinbing Chen,Zhongwei An,Kangcheng Chen,Kenichi Okamoto
A series of crosslinkable sulfonated poly(arylene ether sulfone)s (SPAESs) were synthesized by copolymerization of 4,4′-biphenol with 2,6-difluorobenzil and 3,3′-disulfonated-4,4′-difluorodiphenyl sulfone disodium salt. Quinoxaline-based crosslinked SPAESs were prepared via the cyclocondensation reaction of benzil moieties in polymer chain with 3,3′-diaminobenzidine to form quinoxaline groups acting as covalent and acid-base ionic crosslinking . The uncrosslinked and crosslinked SPAES membranes showed high mechanical properties and the isotropic membrane swelling, while the later became insoluble in tested polar aprotic solvents . The crosslinking significantly improved the membrane performance , i.e., the crosslinked membranes had the lower membrane dimensional change, lower methanol permeability and higher oxidative stability than the corresponding precursor membranes, with keeping the reasonably high proton conductivity . The crosslinked membrane ( CS1-2 ) with measured ion exchange capacity of 1.53 mequiv. g −1 showed a reasonably high proton conductivity of 107 mS/cm with water uptake of 48 wt.% at 80 °C, and exhibited a low methanol permeability of 2.3 × 10 −7 cm 2 s −1 for 32 wt.% methanol solution at 25 °C. The crosslinked SPAES membranes have potential for PEFC and DMFCs.
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
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Yuqi Wang,Yi He,Jing Yu,Hongjie Li,Shuangshuang Li,Shuting Tian
Hydrogel membranes generally possess weak mechanical properties , and the membrane surface is susceptible to abrasion, which results in the loss of superwetting properties and oil/water separation ability. Therefore, we prepared a flexible freestanding membrane using a dual-cross-linking approach. A mixed solution of sodium alginate (SA) and polyvinyl alcohol (PVA) was covalently and ionically cross-linked with borax and calcium chloride (CaCl 2 ) to form a hydrogel, and sodium carbonate (Na 2 CO 3 ) solution was then added to synthesize calcium carbonate (CaCO 3 ) in situ. The combination of covalent and ionic cross-linking improves the tensile strength . The prepared SA/PVA/borax/CaCO 3 (SPBC) membrane maintained excellent superwetting properties and oil/water separation ability, even after abrasion. The SPBC membranes have broad application prospects in the oily wastewater purification owing to their numerous advantages, such as cost effectiveness, high separation efficiency, and improved mechanical strength .
研究领域:
材料科学
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环境工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2023
·
IF 8.4
Bengui Zhang,Zhirong Yang,Qian Liu,Yixin Liu,Yanshi Fu,Xueting Zhang,Sinan Jiang,Xinyan Zhang,Enlei Zhang,Kangjun Wang,Guosheng Wang,Zhigang Zhang,Shouhai Zhang
Vanadium redox flow batteries (VRFB) have many advantages in overcoming the volatility of renewable energy. However, membranes, one of the key materials for VRFB, face crucial challenges, for example, membranes with high conductivity tend to exhibit high swelling, low selectivity, and poor mechanical stability. In this work, new cross-linked membranes (C-PyPEKK) were prepared by blending a novel chloromethylated adamantane-containing polymer (CAPEK) (with a bulky, rigid, twisted backbone) with a unique pyridine-containing polymer (PyPEKK). The synergistic effect of cross-linked structures and bulky, rigidly twisted adamantane-containing backbone gives the membrane excellent membrane swelling resistance and selectivity. C-PyPEKK membranes were selectively swelled and formed wide ion transport channels, enhancing conductivity. The resulting C-PyPEKK membranes exhibited low water uptake (<8.0%), a low swelling ratio (<13.0%) (the uncross-linked PyPEKK membrane showed a high swelling ratio of 28.6%), and high mechanical strength (about 60 MPa). The C-PyPEKK-130 membrane showed a superior conductivity of 52.83 mS cm–1 and outstanding energy efficiencies (EEs) (90.75% at 80 mA cm–2; 79.4% at 300 mA cm–2), which was superior to the Nafion212 membrane (EE = 81.87%, 80 mA cm–2; 75.48%, 300 mA cm–2). The C-PyPEKK membranes showed high cycling stability (3500 cycles) in VRFB. Moreover, the C-PyPEKK membranes were robust and showed good battery performance after being immersed in strongly acidic and oxidizing 1.5 M VO2+ in 3 M H2SO4 solutions for 9 months, showing excellent chemical stability. This work proposes a new preparation route for membranes with high conductivity, high stability, and excellent mechanical strength for potential VRFB applications from unique new membrane materials combined with cross-linked membrane structures and unique conduction enhancement strategies.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2024
·
IF 8.4
Huimin Ruan,Zhihao Lin,Shangshang Gao,Junbin Liao,Arcadio Sotto,Yuyang Yao,Zhipeng Xu,Jiangnan Shen,Edison Huixiang Ang
Electrodialysis (ED) was widely use for sulfuric acid (H 2 SO 4 ) recovery. However, challenges such as proton leakage during ED processes and the presence of large amounts of organic solvents in the wastewater have limited the recovered acid concentration to less than 30 wt% and shortened membrane lifespan. In this study, we prepared a series of anion exchange membranes (AEMs) using 3-aminopropyltrimethoxysilane (APTMS) and phenyltriethoxysilane (phTES) as cross-linking agents aimed at concentrating H 2 SO 4 through the ED process. As the content of bis-siloxane crosslinkers increased, the ion exchange capacity (IEC) of the membranes decreased from 1.86 to 1.27 mmol g −1 , resulting in lower water flux and membrane conductivity. However, the increased crosslinker content significantly enhanced membrane hydrophobicity, thereby improving its acid-blocking properties. During ED operations at a current density of 10 mA cm −2 , the BPPO-10APTMS-10phTES membrane achieved a H + concentration of 2.15 mol/L (from an initial concentration of 1.00 mol/L), outperforming AEMs without cross-linking structure. Additionally, the BPPO-xAPTMS-xphTES membranes (x = 5, 10, and 15) exhibited strong resistance to organic solvents. This research offers valuable theoretical guidance for developing AEMs with enhanced acid concentration capabilities and solvent resistance.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS CHEMISTRY
·
2012
·Vol. 22
·期 26
·13295-13302
·
IF 5.968
Shuai Xu,Gang Zhang,Yang Zhang,Chengji Zhao,Liyuan Zhang,Mingyu Li,Jing Wang,Na Zhang,Hui Na
A series of novel poly(ether ether ketone) copolymers containing methyl groups on the side chain were prepared based on a new monomer (3,4-dimethyl)phenylhydroquinone. Then a series of hydroxide exchange membranes with different IEC values were obtained through bromination and quaternary amination of the copolymers. By adjusting the contents of methyl groups in the copolymers, we could control the final structures of the membranes. The chemical structures of the monomers and copolymers were analyzed by 1H NMR spectroscopy. After that, for the purpose of enhancing the dimensional stability and methanol resistance of the membrane, we prepared cross-linked membranes through a Friedel–Crafts reaction between bromomethyl groups and aromatic rings. The properties of the membranes related to fuel cell application were evaluated in detail. All the membranes showed good thermal and mechanical stabilities and conductivities. Moreover, the cross-linked membranes exhibit better dimensional stabilities and selectivities. Among those membranes, xPEEK–Q-100 showed a high conductivity (0.036 S cm−1 at 80 °C), a low swelling ratio of 6.6% and a methanol permeation coefficient of 2.9 × 10−7 cm2 s−1. The outstanding properties indicated that the application of PEEK–Q-xx membranes in fuel cells was promising.
研究领域:
材料科学
·
化学工程
·
能源技术
✓ 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）