Bulletin of the American Physical Society
APS March Meeting 2024
Monday–Friday, March 4–8, 2024; Minneapolis & Virtual
Session N00: Poster Session II (11:30am-2:30pm CST)
11:30 AM,
Wednesday, March 6, 2024
Room: Hall BC
Sponsoring
Unit:
APS/SPS
Abstract: N00.00060 : Structural Dynamics Evolution of EVOH during Polymer Upcycling Reaction by Ex-Situ Electrochemical Impedance Spectroscopy*
Presenter:
Chien-Hua Tu
(University of Pennsylvania)
Authors:
Chien-Hua Tu
(University of Pennsylvania)
Eli J Fastow
(University of Pennsylvania)
Anne Radzanowski
(University of Massachusetts Amherst)
Bryan Coughlin
(University of Massachusetts Amherst)
Karen I Winey
(University of Pennsylvania)
In this study, we use electrochemical impedance spectroscopy (EIS) to investigate the structural dynamics of these novel polymers. Surprisingly, an additional relaxation process between the slowest segmental and fastest subsegmental dynamics, is revealed via extremely deep quenching to ~160K below the glass transition temperature (Tg). Coupling our EIS experiments with X-ray scattering and thermal analysis we correlate the dynamics to the semicrystalline structure. These findings are expected to address an important polymer physics question of how the amorphous polymer segments form a glass region between lamellar crystals, particularly the existence of rigid amorphous fraction (RAF) and mobile amorphous fraction (MAF) in semicrystalline polymers. Finally, we expect to correlate the subsegmental relaxations to oxygen transport behavior.
*This research was financially supported by the DOE BES through the grant No. BES (DESC0022238).
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