Proton conducting grafted/crosslinked membranes prepared from poly(vinylidene fluoride-co-chlorotrifluoroethylene) copolymer

Jin Ah Seo, Yong Woo Kim, Dong Kyu Roh, Yong Gun Shul, Jong Hak Kim

Research output: Contribution to journalArticle

10 Citations (Scopus)

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 6wt% of SA concentration, above which it decreased monotonically. The membrane also exhibited a maximum proton conductivity of 0.062S/cm at 6wt% 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.

Original languageEnglish
Pages (from-to)1434-1441
Number of pages8
JournalPolymers for Advanced Technologies
Volume22
Issue number10
DOIs
Publication statusPublished - 2011 Oct 1

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Protons
Copolymers
Membranes
Acids
Graft copolymers
Crosslinking
Styrene
Proton conductivity
Sulfonic Acids
Atom transfer radical polymerization
Grafts
Hydroxyl Radical
Nuclear magnetic resonance spectroscopy
Infrared spectroscopy
Ion exchange
Thermodynamic stability
Polymerization
Crystalline materials
Transmission electron microscopy
chlorotrifluoroethylene

All Science Journal Classification (ASJC) codes

  • Polymers and Plastics

Cite this

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title = "Proton conducting grafted/crosslinked membranes prepared from poly(vinylidene fluoride-co-chlorotrifluoroethylene) copolymer",
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 6wt{\%} of SA concentration, above which it decreased monotonically. The membrane also exhibited a maximum proton conductivity of 0.062S/cm at 6wt{\%} 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.",
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Proton conducting grafted/crosslinked membranes prepared from poly(vinylidene fluoride-co-chlorotrifluoroethylene) copolymer. / Seo, Jin Ah; Kim, Yong Woo; Roh, Dong Kyu; Shul, Yong Gun; Kim, Jong Hak.

In: Polymers for Advanced Technologies, Vol. 22, No. 10, 01.10.2011, p. 1434-1441.

Research output: Contribution to journalArticle

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AU - Kim, Yong Woo

AU - Roh, Dong Kyu

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AU - Kim, Jong Hak

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AB - 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 6wt% of SA concentration, above which it decreased monotonically. The membrane also exhibited a maximum proton conductivity of 0.062S/cm at 6wt% 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.

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