Preparation of ion exchange membranes by preirradiation induced grafting of styrene/divinylbenzene into crosslinked PTFE films and successive sulfonation

Jingye Li*, Shogo Ichizuri, Saneto Asano, Fumihiro Mutou, Shigetoshi Ikeda, Minora Iida, Takaharu Miura, Akihiro Oshima, Yoneho Tabata, Masakazu Washio

*この研究の対応する著者

研究成果: Article査読

9 被引用数 (Scopus)

抄録

Ion exchange membranes (IEMs) were prepared by preirradiation induced grafting of styrene with or without divinylbenzene (DVB) into crosslinked polytetrafluoroethylene (RX-PTFE) films and successively sulfonated by chlorosulfonic acid. The effects of the DVB concentration and solvent on the kinetic of the graft polymerization were studied. The ion exchange capacity (IEC) values of the prepared membranes ranging from 1.5 to 2.8 mequiv/g were obtained. The degree of swelling increased with the increase in the degree of grafting, while higher crosslinking density of both the RX-PTFE matrices and the grafts suppressed the degree of swelling. The chemical stabilities of the IEMs were tested by recording the weight of the membranes being soaked in hot H 2O2 solutions. The weight-time curves of the prepared membranes showed one-step quick decrease due to the decomposition of the poly(styrene-sulfonic acid) (PSSA) grafts. Higher crosslinking density in both the RX-PTFE matrices and the grafts improved the chemical stability of the IEMs. The ionic conductivity of the IEMs increases with the increase in the IEC values. The IEMs with IEC values higher than 2.2 mequiv/g hold the higher ionic conductivity than that of Nafion® 112 membrane.

本文言語English
ページ(範囲)3587-3599
ページ数13
ジャーナルJournal of Applied Polymer Science
101
6
DOI
出版ステータスPublished - 2006 9月 15

ASJC Scopus subject areas

  • 化学 (全般)
  • 表面、皮膜および薄膜
  • ポリマーおよびプラスチック
  • 材料化学

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