JCSET | Sigma Xi Poster Competition

Title

Ionic Liquid-Functionalized Cellulose Derivatives: Synthesis, Characterization, and Properties

Academic Level at Time of Presentation

Senior

Major

Biochemistry

Minor

Biology

2nd Student Academic Level at Time of Presentation

Junior

2nd Student Major

Biochemistry

2nd Student Minor

Biology

List all Project Mentors & Advisor(s)

Dr. Kevin Miller, PhD

Presentation Format

Poster Presentation

Abstract/Description

As cellulose represents an inexpensive and sustainable biomacromolecule, the ability to functionalize the backbone with an ionic liquid and generate conductive materials is of great interest. Here, several 1,2,3-triazolium-functionalized cellulose derivatives were prepared using an azide-alkyne “click” cyclization strategy, followed by quaternization. Thermal, conductive, and morphological properties of the resulting materials were analyzed using a diverse set of techniques, including nuclear magnetic resonance spectroscopy (NMR), Fourier transform infrared spectroscopy (FTIR), thermal gravimetric analysis (TGA), differential scanning calorimetry (DSC), X-ray scattering, and dielectric relaxation spectroscopy (DRS). All of the IL-functionalized cellulosic materials exhibited a Tg, the values of which were inversely dependent upon the size of the counteranion. The materials were amorphous in nature, showing clear nanophase separation which was also dependent upon the counteranion size. Ionic conductivity of the IL-functionalized materials was 6-orders of magnitude higher than native cellulose. Further tethering of an additional IL (imidazolium) moiety to the 1,2,3-triazolium linkage led to a decrease in Tg and an increase in ionic conductivity.

Spring Scholars Week 2022 Event

Sigma Xi Poster Competition

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Ionic Liquid-Functionalized Cellulose Derivatives: Synthesis, Characterization, and Properties

As cellulose represents an inexpensive and sustainable biomacromolecule, the ability to functionalize the backbone with an ionic liquid and generate conductive materials is of great interest. Here, several 1,2,3-triazolium-functionalized cellulose derivatives were prepared using an azide-alkyne “click” cyclization strategy, followed by quaternization. Thermal, conductive, and morphological properties of the resulting materials were analyzed using a diverse set of techniques, including nuclear magnetic resonance spectroscopy (NMR), Fourier transform infrared spectroscopy (FTIR), thermal gravimetric analysis (TGA), differential scanning calorimetry (DSC), X-ray scattering, and dielectric relaxation spectroscopy (DRS). All of the IL-functionalized cellulosic materials exhibited a Tg, the values of which were inversely dependent upon the size of the counteranion. The materials were amorphous in nature, showing clear nanophase separation which was also dependent upon the counteranion size. Ionic conductivity of the IL-functionalized materials was 6-orders of magnitude higher than native cellulose. Further tethering of an additional IL (imidazolium) moiety to the 1,2,3-triazolium linkage led to a decrease in Tg and an increase in ionic conductivity.