Ion transport in helical-helical polypeptide polymerized ionic liquid block copolymers

Yingying Chen, Tianjian Yang, Yao Lin and Christopher M. Evans ()
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Yingying Chen: University of Illinois Urbana-Champaign
Tianjian Yang: University of Connecticut
Yao Lin: University of Connecticut
Christopher M. Evans: University of Illinois Urbana-Champaign

Nature Communications, 2025, vol. 16, issue 1, 1-9

Abstract: Abstract Helical-helical polypeptide polymerized ionic liquid block copolymers (PPIL BCPs) are synthesized to investigate the role of helical structure on self-assembly and ionic conductivity. PPIL BCPs, consisting of a cationic polypeptide (PTPLG) with bis(trifluoromethane sulfonimide) (TFSI) counterion and varying lengths connected to a length-fixed neutral poly-(γ-benzyl-L-glutamate) (PBLG) block, exhibit stable helical conformations with minimal glass transition (Tg) variation. Here, we show that increasing PIL composition leads to a transition from poorly ordered to highly ordered lamellar (LAM) structures with the highest PIL content BCP forming a bilayer LAM structure with close-packed helices. This morphology yields a 1.5 order of magnitude higher Tg- and volume fraction-normalized ionic conductivity and a morphology factor f > 0.8 compared to less ordered BCPs with f

Date: 2025
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DOI: 10.1038/s41467-025-57784-9

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