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- Title
Proton conducting grafted/crosslinked membranes prepared from poly(vinylidene fluoride- co-chlorotrifluoroethylene) copolymer.
- Authors
Seo, Jin Ah; Kim, Yong Woo; Roh, Dong Kyu; Shul, Yong Gun; Kim, Jong Hak
- Abstract
Poly(vinylidene fluoride- co-chlorotrifluoroethylene) (P(VDF- co-CTFE)) backbone was grafted with crosslinkable chains of poly(hydroxyl ethyl acrylate) (PHEA) and proton conducting chains of poly(styrene sulfonic acid) (PSSA) to produce amphiphilic P(VDF- co-CTFE)-g-P(HEA- co-SSA) graft copolymer via atom transfer radical polymerization (ATRP). Successful synthesis and microphase-separated structure of the copolymer were confirmed by 1H NMR, FT-IR spectroscopy, and TEM analysis. Furthermore, this graft copolymer was thermally crosslinked with sulfosuccinic acid (SA) to produce grafted/crosslinked membranes. Ion exchange capacity (IEC) increased continuously with increasing SA contents but the water uptake increased up to 6 wt% of SA concentration, above which it decreased monotonically. The membrane also exhibited a maximum proton conductivity of 0.062 S/cm at 6 wt% of SA concentration, resulting from competitive effect between the increase of ionic groups and the degree of crosslinking. XRD patterns also revealed that the crystalline structures of P(VDF- co-CTFE) disrupted upon graft polymerization and crosslinking. These membranes exhibited good thermal stability at least up to 250°C, as revealed by TGA. Copyright © 2009 John Wiley & Sons, Ltd.
- Subjects
PROTONS; POLYMERIZATION; CROSSLINKING (Polymerization); COPOLYMERS; THERMAL analysis; POLYCHLOROTRIFLUOROETHYLENE
- Publication
Polymers for Advanced Technologies, 2011, Vol 22, Issue 10, p1434
- ISSN
1042-7147
- Publication type
Article
- DOI
10.1002/pat.1629