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Author ORCID Identifier
https://orcid.org/0000-0003-1687-897X
AccessType
Open Access Dissertation
Document Type
dissertation
Degree Name
Doctor of Philosophy (PhD)
Degree Program
Polymer Science and Engineering
Year Degree Awarded
2022
Month Degree Awarded
May
First Advisor
Ryan C. Hayward
Second Advisor
Todd S. Emrick
Third Advisor
Sarah L. Perry
Subject Categories
Polymer and Organic Materials
Abstract
Polymerized ionic liquids (PILs), a class of polyelectrolytes, are fascinating materials for various applications utilizing ion transport, especially due to their advantageous properties including negligible vapor pressure, low flammability, thermal stability, high conductivity, and wide electrochemical stability windows. Furthermore, PILs are tunable in their properties such as ionic conductivity, glass transition temperature (Tg), solubility, and (electro-)chemical stability. In this thesis, we focus on fundamental studies of phase behaviors of PILs in the solution and bulk states in chapters 2 and 3, respectively. Specifically, non-aqueous systems are used to study the effect of solvent quality in the regime of relatively low solvent dielectric constant, which has not been previously explored experimentally in the field of polyelectrolyte complex coacervation (Chapter 2). From the resulting coacervate phase diagrams in this study, we ascribe the significant differences in salt resistance of coacervates for the two systems as likely reflecting the influence of solvent dielectric constant. The phase behavior of PILs in bulk is also investigated by studying miscibility of oppositely charged PILs with varying charge density and counterion chemistry (Chapter 3). By introducing a miscible ionic pair to a non-charged immiscible polymer blend, miscibility is induced even with a small content (6 – 10 mol%) of charged comonomer. We also show that the mutual miscibility of ionic components manipulates the resulting miscibility of the blends. Finally, we attempt to fabricate a bi-continuous structure of oppositely charged PIL networks using a mesoporous polymer template, which provides an opportunity for developing a new type of electroactive soft actuators with large strain and low operating voltages (Chapter 4).
DOI
https://doi.org/10.7275/28568555
Recommended Citation
Lee, Minjung, "PHASE BEHAVIOR OF OPPOSITELY CHARGED POLYMERIZED IONIC LIQUIDS IN SOLUTION, BULK, AND CROSSLINKED NETWORK STATES" (2022). Doctoral Dissertations. 2545.
https://doi.org/10.7275/28568555
https://scholarworks.umass.edu/dissertations_2/2545
Creative Commons License
This work is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License.