The Experts below are selected from a list of 3135 Experts worldwide ranked by ideXlab platform
Rongrong Chen - One of the best experts on this subject based on the ideXlab platform.
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developing a novel alkaline anion exchange membrane derived from poly ether imide for improved ionic conductivity
Polymers for Advanced Technologies, 2010Co-Authors: Guigui Wang, Yiming Weng, Jun Zhao, Deryn Chu, Dong Xie, Rongrong ChenAbstract:We have developed a novel alkaline anion exchange membrane derived from poly(ether-imide) for improved ionic conductivity. The effects of several important parameters on the chloromethylation of the membrane were investigated. These parameters included reaction temperature, reaction time, concentration of chloromethylation agent, concentration of polymer, and the amount of catalyst. The Quaternization of the synthesized chloromethylated polymer was studied as well. The results show that all the studied parameters exhibited significant impacts on chloromethylation. Among them, the concentration of the chloromethylation agent played a key role in increasing the chloromethyl functional group attachment onto the polymer. It was found that the gelation could be avoided if these reaction parameters were controlled. It was also found that using an appropriate Quaternization approach could significantly improve the ionic conductivity and optimize the conductivity of the membrane even though the functional chloromethyl groups attached to the polymer are limited. Copyright © 2009 John Wiley & Sons, Ltd.
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developing a polysulfone based alkaline anion exchange membrane for improved ionic conductivity
Journal of Membrane Science, 2009Co-Authors: Guigui Wang, Yiming Weng, Deryn Chu, Rongrong Chen, Dong XieAbstract:Abstract Alkaline anion exchange membranes of high ionic conductivities were made from polysulfone by adding a chloromethyl pendant group to the polysulfone at different reaction times and temperatures, followed by reacting the chloromethyl group with different amines to form different quaternary ammonium pendant groups which acted as the counterion for hydroxide anion. The effects of temperature and time on chloromethylation of the polymer were investigated and the chloromethylation was optimized. Furthermore, different approaches for Quaternization of the synthesized chloromethylated polymer were studied. The results show that both temperature and time exhibited significant impacts on chloromethylation and gelation. It was also found that using an appropriate Quaternization approach could significantly improve the ionic conductivity and also could optimize the conductivity of the membrane even though the accessible functional chloromethyl groups were limited. The developed AAEM showed the ionic conductivity up to 3.1 × 10 −2 S/cm at room temperature. Increasing temperature increased the ionic conductivity up to 7.33 × 10 −2 S/cm. The formed AAEM was stable in a concentrated base up to 8.0 M KOH at room temperature.
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developing a polysulfone based alkaline anion exchange membrane for improved ionic conductivity
Journal of Membrane Science, 2009Co-Authors: Guigui Wang, Yiming Weng, Rongrong ChenAbstract:Abstract Alkaline anion exchange membranes of high ionic conductivities were made from polysulfone by adding a chloromethyl pendant group to the polysulfone at different reaction times and temperatures, followed by reacting the chloromethyl group with different amines to form different quaternary ammonium pendant groups which acted as the counterion for hydroxide anion. The effects of temperature and time on chloromethylation of the polymer were investigated and the chloromethylation was optimized. Furthermore, different approaches for Quaternization of the synthesized chloromethylated polymer were studied. The results show that both temperature and time exhibited significant impacts on chloromethylation and gelation. It was also found that using an appropriate Quaternization approach could significantly improve the ionic conductivity and also could optimize the conductivity of the membrane even though the accessible functional chloromethyl groups were limited. The developed AAEM showed the ionic conductivity up to 3.1 × 10 −2 S/cm at room temperature. Increasing temperature increased the ionic conductivity up to 7.33 × 10 −2 S/cm. The formed AAEM was stable in a concentrated base up to 8.0 M KOH at room temperature.
Guigui Wang - One of the best experts on this subject based on the ideXlab platform.
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developing a novel alkaline anion exchange membrane derived from poly ether imide for improved ionic conductivity
Polymers for Advanced Technologies, 2010Co-Authors: Guigui Wang, Yiming Weng, Jun Zhao, Deryn Chu, Dong Xie, Rongrong ChenAbstract:We have developed a novel alkaline anion exchange membrane derived from poly(ether-imide) for improved ionic conductivity. The effects of several important parameters on the chloromethylation of the membrane were investigated. These parameters included reaction temperature, reaction time, concentration of chloromethylation agent, concentration of polymer, and the amount of catalyst. The Quaternization of the synthesized chloromethylated polymer was studied as well. The results show that all the studied parameters exhibited significant impacts on chloromethylation. Among them, the concentration of the chloromethylation agent played a key role in increasing the chloromethyl functional group attachment onto the polymer. It was found that the gelation could be avoided if these reaction parameters were controlled. It was also found that using an appropriate Quaternization approach could significantly improve the ionic conductivity and optimize the conductivity of the membrane even though the functional chloromethyl groups attached to the polymer are limited. Copyright © 2009 John Wiley & Sons, Ltd.
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developing a polysulfone based alkaline anion exchange membrane for improved ionic conductivity
Journal of Membrane Science, 2009Co-Authors: Guigui Wang, Yiming Weng, Deryn Chu, Rongrong Chen, Dong XieAbstract:Abstract Alkaline anion exchange membranes of high ionic conductivities were made from polysulfone by adding a chloromethyl pendant group to the polysulfone at different reaction times and temperatures, followed by reacting the chloromethyl group with different amines to form different quaternary ammonium pendant groups which acted as the counterion for hydroxide anion. The effects of temperature and time on chloromethylation of the polymer were investigated and the chloromethylation was optimized. Furthermore, different approaches for Quaternization of the synthesized chloromethylated polymer were studied. The results show that both temperature and time exhibited significant impacts on chloromethylation and gelation. It was also found that using an appropriate Quaternization approach could significantly improve the ionic conductivity and also could optimize the conductivity of the membrane even though the accessible functional chloromethyl groups were limited. The developed AAEM showed the ionic conductivity up to 3.1 × 10 −2 S/cm at room temperature. Increasing temperature increased the ionic conductivity up to 7.33 × 10 −2 S/cm. The formed AAEM was stable in a concentrated base up to 8.0 M KOH at room temperature.
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developing a polysulfone based alkaline anion exchange membrane for improved ionic conductivity
Journal of Membrane Science, 2009Co-Authors: Guigui Wang, Yiming Weng, Rongrong ChenAbstract:Abstract Alkaline anion exchange membranes of high ionic conductivities were made from polysulfone by adding a chloromethyl pendant group to the polysulfone at different reaction times and temperatures, followed by reacting the chloromethyl group with different amines to form different quaternary ammonium pendant groups which acted as the counterion for hydroxide anion. The effects of temperature and time on chloromethylation of the polymer were investigated and the chloromethylation was optimized. Furthermore, different approaches for Quaternization of the synthesized chloromethylated polymer were studied. The results show that both temperature and time exhibited significant impacts on chloromethylation and gelation. It was also found that using an appropriate Quaternization approach could significantly improve the ionic conductivity and also could optimize the conductivity of the membrane even though the accessible functional chloromethyl groups were limited. The developed AAEM showed the ionic conductivity up to 3.1 × 10 −2 S/cm at room temperature. Increasing temperature increased the ionic conductivity up to 7.33 × 10 −2 S/cm. The formed AAEM was stable in a concentrated base up to 8.0 M KOH at room temperature.
Dong Xie - One of the best experts on this subject based on the ideXlab platform.
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developing a novel alkaline anion exchange membrane derived from poly ether imide for improved ionic conductivity
Polymers for Advanced Technologies, 2010Co-Authors: Guigui Wang, Yiming Weng, Jun Zhao, Deryn Chu, Dong Xie, Rongrong ChenAbstract:We have developed a novel alkaline anion exchange membrane derived from poly(ether-imide) for improved ionic conductivity. The effects of several important parameters on the chloromethylation of the membrane were investigated. These parameters included reaction temperature, reaction time, concentration of chloromethylation agent, concentration of polymer, and the amount of catalyst. The Quaternization of the synthesized chloromethylated polymer was studied as well. The results show that all the studied parameters exhibited significant impacts on chloromethylation. Among them, the concentration of the chloromethylation agent played a key role in increasing the chloromethyl functional group attachment onto the polymer. It was found that the gelation could be avoided if these reaction parameters were controlled. It was also found that using an appropriate Quaternization approach could significantly improve the ionic conductivity and optimize the conductivity of the membrane even though the functional chloromethyl groups attached to the polymer are limited. Copyright © 2009 John Wiley & Sons, Ltd.
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developing a polysulfone based alkaline anion exchange membrane for improved ionic conductivity
Journal of Membrane Science, 2009Co-Authors: Guigui Wang, Yiming Weng, Deryn Chu, Rongrong Chen, Dong XieAbstract:Abstract Alkaline anion exchange membranes of high ionic conductivities were made from polysulfone by adding a chloromethyl pendant group to the polysulfone at different reaction times and temperatures, followed by reacting the chloromethyl group with different amines to form different quaternary ammonium pendant groups which acted as the counterion for hydroxide anion. The effects of temperature and time on chloromethylation of the polymer were investigated and the chloromethylation was optimized. Furthermore, different approaches for Quaternization of the synthesized chloromethylated polymer were studied. The results show that both temperature and time exhibited significant impacts on chloromethylation and gelation. It was also found that using an appropriate Quaternization approach could significantly improve the ionic conductivity and also could optimize the conductivity of the membrane even though the accessible functional chloromethyl groups were limited. The developed AAEM showed the ionic conductivity up to 3.1 × 10 −2 S/cm at room temperature. Increasing temperature increased the ionic conductivity up to 7.33 × 10 −2 S/cm. The formed AAEM was stable in a concentrated base up to 8.0 M KOH at room temperature.
Yiming Weng - One of the best experts on this subject based on the ideXlab platform.
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developing a novel alkaline anion exchange membrane derived from poly ether imide for improved ionic conductivity
Polymers for Advanced Technologies, 2010Co-Authors: Guigui Wang, Yiming Weng, Jun Zhao, Deryn Chu, Dong Xie, Rongrong ChenAbstract:We have developed a novel alkaline anion exchange membrane derived from poly(ether-imide) for improved ionic conductivity. The effects of several important parameters on the chloromethylation of the membrane were investigated. These parameters included reaction temperature, reaction time, concentration of chloromethylation agent, concentration of polymer, and the amount of catalyst. The Quaternization of the synthesized chloromethylated polymer was studied as well. The results show that all the studied parameters exhibited significant impacts on chloromethylation. Among them, the concentration of the chloromethylation agent played a key role in increasing the chloromethyl functional group attachment onto the polymer. It was found that the gelation could be avoided if these reaction parameters were controlled. It was also found that using an appropriate Quaternization approach could significantly improve the ionic conductivity and optimize the conductivity of the membrane even though the functional chloromethyl groups attached to the polymer are limited. Copyright © 2009 John Wiley & Sons, Ltd.
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developing a polysulfone based alkaline anion exchange membrane for improved ionic conductivity
Journal of Membrane Science, 2009Co-Authors: Guigui Wang, Yiming Weng, Deryn Chu, Rongrong Chen, Dong XieAbstract:Abstract Alkaline anion exchange membranes of high ionic conductivities were made from polysulfone by adding a chloromethyl pendant group to the polysulfone at different reaction times and temperatures, followed by reacting the chloromethyl group with different amines to form different quaternary ammonium pendant groups which acted as the counterion for hydroxide anion. The effects of temperature and time on chloromethylation of the polymer were investigated and the chloromethylation was optimized. Furthermore, different approaches for Quaternization of the synthesized chloromethylated polymer were studied. The results show that both temperature and time exhibited significant impacts on chloromethylation and gelation. It was also found that using an appropriate Quaternization approach could significantly improve the ionic conductivity and also could optimize the conductivity of the membrane even though the accessible functional chloromethyl groups were limited. The developed AAEM showed the ionic conductivity up to 3.1 × 10 −2 S/cm at room temperature. Increasing temperature increased the ionic conductivity up to 7.33 × 10 −2 S/cm. The formed AAEM was stable in a concentrated base up to 8.0 M KOH at room temperature.
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developing a polysulfone based alkaline anion exchange membrane for improved ionic conductivity
Journal of Membrane Science, 2009Co-Authors: Guigui Wang, Yiming Weng, Rongrong ChenAbstract:Abstract Alkaline anion exchange membranes of high ionic conductivities were made from polysulfone by adding a chloromethyl pendant group to the polysulfone at different reaction times and temperatures, followed by reacting the chloromethyl group with different amines to form different quaternary ammonium pendant groups which acted as the counterion for hydroxide anion. The effects of temperature and time on chloromethylation of the polymer were investigated and the chloromethylation was optimized. Furthermore, different approaches for Quaternization of the synthesized chloromethylated polymer were studied. The results show that both temperature and time exhibited significant impacts on chloromethylation and gelation. It was also found that using an appropriate Quaternization approach could significantly improve the ionic conductivity and also could optimize the conductivity of the membrane even though the accessible functional chloromethyl groups were limited. The developed AAEM showed the ionic conductivity up to 3.1 × 10 −2 S/cm at room temperature. Increasing temperature increased the ionic conductivity up to 7.33 × 10 −2 S/cm. The formed AAEM was stable in a concentrated base up to 8.0 M KOH at room temperature.
Seunghyeon Moon - One of the best experts on this subject based on the ideXlab platform.
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anion exchange membrane prepared from simultaneous polymerization and Quaternization of 4 vinyl pyridine for non aqueous vanadium redox flow battery applications
Journal of Power Sources, 2014Co-Authors: Sandip Maurya, Sunghee Shin, Kiwon Sung, Seunghyeon MoonAbstract:Abstract A simple, single step and environmentally friendly process is developed for the synthesis of anion exchange membrane (AEM) by simultaneous polymerization and Quaternization, unlike the conventional membrane synthesis which consists of separate polymerization and Quaternization step. The membrane synthesis is carried out by dissolving polyvinyl chloride (PVC) in cyclohexanone along with 4-vinyl pyridine (4VP) and 1,4-dibromobutane (DBB) in the presence of thermal initiator benzoyl peroxide, followed by film casting to get thin and flexible AEMs. The membrane properties such as ion exchange capacity, ionic conductivity and swelling behaviour are tuned by varying the degree of crosslinking. These AEMs exhibit low vanadium permeability, while retaining good dimensional and chemical stability in an electrolyte solution, making them appropriate candidates for non-aqueous vanadium acetylacetonate redox flow battery (VRFB) applications. The optimized membrane displays ion exchange capacity and ionic conductivity of 2.0 mequiv g−1 and 0.105 mS cm−1, respectively, whereas the efficiency of 91.7%, 95.7% and 87.7% for coulombic, voltage and energy parameter in non-aqueous VRFB, respectively. This study reveals that the non-aqueous VRFB performance is greatly influenced by membrane properties; therefore the optimal control over the membrane properties is advantageous for the improved performance.
