Pendant Group Functionalization of Cyclic Olefin for High Temperature and High-Density Energy Storage

Bibliographische Detailangaben
Veröffentlicht in:	Advanced materials (Deerfield Beach, Fla.). - 1998. - (2024) vom: 20. Mai, Seite e2402133
1. Verfasser:	Shukla, Stuti (VerfasserIn)
Weitere Verfasser:	Wu, Chao, Mishra, Ankit, Pan, Junkun, Charnay, Aaron P, Khomane, Ashish, Deshmukh, Ajinkya, Zhou, Jierui, Mukherjee, Madhubanti, Gurnani, Rishi, Rout, Pragati, Casalini, Riccardo, Ramprasad, Rampi, Fayer, Michael D, Vashishta, Priya, Cao, Yang, Sotzing, Gregory
Format:	Online-Aufsatz
Sprache:	English
Veröffentlicht:	2024
Zugriff auf das übergeordnete Werk:	Advanced materials (Deerfield Beach, Fla.)
Schlagworte:	Journal Article breakdown electronic bandgap free volume glass transition polymer dielectrics

Beschreibung
Zusammenfassung:	© 2024 Wiley‐VCH GmbH. High-temperature flexible polymer dielectrics are critical for high density energy storage and conversion. The need to simultaneously possess a high bandgap, dielectric constant and glass transition temperature forms a substantial design challenge for novel dielectric polymers. Here, by varying halogen substituents of an aromatic pendant hanging off a bicyclic mainchain polymer, a class of high-temperature olefins with adjustable thermal stability are obtained, all with uncompromised large bandgaps. Halogens substitution of the pendant groups at para or ortho position of polyoxanorborneneimides (PONB) imparts it with tunable high glass transition from 220 to 245 °C, while with high breakdown strength of 625-800 MV/m. A high energy density of 7.1 J/cc at 200 °C is achieved with p-POClNB, representing the highest energy density reported among homo-polymers. Molecular dynamic simulations and ultrafast infrared spectroscopy are used to probe the free volume element distribution and chain relaxations pertinent to dielectric thermal properties. An increase in free volume element is observed with the change in the pendant group from fluorine to bromine at the para position; however, smaller free volume element is observed for the same pendant when at the ortho position due to steric hindrance. With the dielectric constant and bandgap remaining stable, properly designing the pendant groups of PONB boosts its thermal stability for high density electrification
Beschreibung:	Date Revised 11.06.2024 published: Print-Electronic Citation Status Publisher
ISSN:	1521-4095
DOI:	10.1002/adma.202402133