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Master Thesis 3-Yizi Cheng.pdf (1.25 MB)

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THE DECOUPLING BEHAVIOR OF SEGMENTAL DYNAMICS AND CONDUCTIVITY IN POLYMERIZED IONIC LIQUIDS

Cheng, Yizi
http://rave.ohiolink.edu/etdc/view?acc_num=akron1495027268300182

Abstract Details

, Master of Science, University of Akron, Polymer Engineering.
Recently, Polymerized Ionic liquid (PILs) has received great attention as a possible environmental friendly energy storage material. The major challenge for the application of this material is that the conductivity of ions is restricted and coupled to the slow segmental relaxation process. In this work, we employ a coarse-grained PIL model which contains neutral beads, charged bonded ion beads and free ion beads, and by using a molecular simulation method combined with a predictive stepwise quenching protocol (PreSQ), we studied the ionic conductivity temperature dependence behavior, structure relaxation behavior and the decoupling behavior between these two processes in several PIL models which have varied ion sizes and morphologies. We demonstrate that ionic conductivity temperature dependence behavior could be decoupled from structural relaxation process in PILs, and a formation of ion percolating network like structure could achieve both high conductivity and low glass transition temperature at the same time. We also show that the degree of the decoupling correlates with the free counter-ion size, and the smaller free ion size will give a faster ion transportation and also more obvious decoupling behavior. At the same time, varying the bonded ion size doesn’t have a great effect on ion conductivity and decoupling behavior in these systems, but increasing bonded ion size could reduce the glass transition temperatures to some extent. These results suggest that the employment of more phase-separated, smaller free counter-ion size and larger bonded ion size might lead to the design of polymers with higher ionic conductivity and more obvious decoupling behavior. This study provides a conceptual idea of how to design high conductivity and high decoupling degree PILs for future energy application.
David Simmons (Advisor)
Polymers

Recommended Citations

Citations

  • Cheng, Y. (n.d.). THE DECOUPLING BEHAVIOR OF SEGMENTAL DYNAMICS AND CONDUCTIVITY IN POLYMERIZED IONIC LIQUIDS [Master's thesis, University of Akron]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=akron1495027268300182

    APA Style (7th edition)

  • Cheng, Yizi. THE DECOUPLING BEHAVIOR OF SEGMENTAL DYNAMICS AND CONDUCTIVITY IN POLYMERIZED IONIC LIQUIDS. University of Akron, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=akron1495027268300182.

    MLA Style (8th edition)

  • Cheng, Yizi. "THE DECOUPLING BEHAVIOR OF SEGMENTAL DYNAMICS AND CONDUCTIVITY IN POLYMERIZED IONIC LIQUIDS." Master's thesis, University of Akron. Accessed APRIL 25, 2024. http://rave.ohiolink.edu/etdc/view?acc_num=akron1495027268300182

    Chicago Manual of Style (17th edition)

akron1495027268300182
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© , some rights reserved.Creative Commons License THE DECOUPLING BEHAVIOR OF SEGMENTAL DYNAMICS AND CONDUCTIVITY IN POLYMERIZED IONIC LIQUIDS by Yizi Cheng is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License. Based on a work at etd.ohiolink.edu.
This open access ETD is published by University of Akron and OhioLINK.