Borane-mediated radical polymerization; preparation of fluoropolymers for high energy density capacitors

Zhi Cheng Zhang, T. C. Mike Chung

Research output: Contribution to journalArticle

Abstract

This paper discusses two closely relative areas, including the borane-mediated radical polymerization mechanism and the formed fluoropolymers used as the dielectrics thin films in high energy density capacitors for energy storage. The system of borane/oxygen control radical initiators are surprisingly effective for initiating polymerization of fluoromonomers, such as vinylidene fluoride (VDF), trifluoroethylene (TrFE), chlorotrifluoroethylene (CTFE), etc., at ambient temperature. Mechanistic study indicates that the in situ formed alkyl radical (C*) is responsible for the initiation, and the borinate radical (B-O*) forms a reversible bond with the propagating radical to prolong the polymerization. The control polymerization is characterized by predictable molecular weight, narrow molecular weight distribution, formation of diblock copolymer and chain end functionalized polymers, and tolerance to many functional groups that usually cause chain transfer reactions in regular free radical polymerization. The other aspect of this paper is to apply this control polymerization to prepare a whole family of PVDF copolymers. By systematically tuning the polymer chain conformation and crystal structure, we have identified the most suitable fluoropolymer for thin film capacitor that exhibits high energy density and low energy loss.

Original languageEnglish (US)
Pages (from-to)331-344
Number of pages14
JournalACS Symposium Series
Volume1024
DOIs
StatePublished - Aug 13 2009

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Boranes
Fluorine containing polymers
Free radical polymerization
Capacitors
Polymerization
Polymers
Dielectric films
Molecular weight distribution
Energy storage
Functional groups
Block copolymers
Conformations
Energy dissipation
Copolymers
Tuning
Crystal structure
Molecular weight
Oxygen
Thin films
Temperature

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)

Cite this

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Borane-mediated radical polymerization; preparation of fluoropolymers for high energy density capacitors. / Zhang, Zhi Cheng; Mike Chung, T. C.

In: ACS Symposium Series, Vol. 1024, 13.08.2009, p. 331-344.

Research output: Contribution to journalArticle

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