Murray State Theses and Dissertations

Abstract

Poly(ionic liquid)s (PILs) have been examined in recent years for applications in various technologies, including solid-state lithium ion batteries and gas separation membranes. In this work, a series of bisimidazolium-containing, Michael addition donors were synthesized and used to produce a series of covalently crosslinked PIL polyester networks containing bis(trifluoromethylsulfonyl)imide as the counteranion. Within the series, the length of alkyl spacer between the two imidazolium cations and the diacrylate to acetoacetate monomer ratio were varied in an attempt to correlate structural variations with the thermal, mechanical, and conductive properties of the PILs. Keeping the diacrylate to acetoacetate ratio constant, increasing the alkyl spacer length showed unexpected results, with the moderate spacer length (hexyl) exhibiting the highest ionic conductivity, lowest glass transition temperature (Tg), and highest thermal stability (by measurement of 5% thermal decomposition temperatures, Td5%). When the diacrylate to acetoacetate ratio was increased, the polymers displayed higher apparent crosslink densities (ρx), Tg values, and Td5% values; however, a lower ionic conductivity was observed.

In addition to the bisimidazolium work, a series of polymers were generated that used commercially available poly(ethylene glycol) (PEG) containing diacrylates as a method to incorporate PEG into the polyester backbone of imidazolium-containing Michael addition networks. These polymers used a monoimidazolium acetoacetate monomer in order to establish a baseline for PEG incorporation. The length of the PEG diacrylate was varied in order to attempt to correlate PEG-concentration with mechanical, thermal, and conductive properties. PEG-containing polymers exhibited lower Tg, higher ρx, and higher conductivities than the non-PEG-containing PIL network.

Year manuscript completed

2016

Year degree awarded

2016

Author's Keywords

Poly(Ionic Liquids), Polymer, Ionic Liquids, PEG, Poly(ethylene Glycol)

Degree Awarded

Master of Science

Department

Chemistry

College/School

Jesse D. Jones College of Science, Engineering and Technology

Thesis Advisor

Kevin M Miller

Committee Chair

Kevin M Miller

Committee Member

Rachel J Allenbaugh

Committee Member

R Daniel Johnson

Committee Member

Chris Trzepacz

Document Type

Thesis

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