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Ion-track grafting of vinylbenzyl chloride into poly(ethylene-co-tetrafluoroethylene) films; Kinetic analysis of reaction-medium effects

Yamaki, Tetsuya; Nuryanthi, N.*; Kitamura, Akane; Koshikawa, Hiroshi; Yoshimura, Kimio; Sawada, Shinichi; Asano, Masaharu*; Maekawa, Yasunari; Suzuki, Akihiro*; Terai, Takayuki*

We investigated the ion-track grafting of vinylbenzyl chloride (VBC) into a poly(ethylene-${it co}$-tetrafluoroethylene) (ETFE) film using different grafting media for applications as anion exchange membranes for fuel cells. In an attempt to increase the grafting yield, we applied a poor solvent system as the grafting medium, ${it i.e.}$, a mixture of water and isopropyl alcohol (H$$_{2}$$O-${it i}$PrOH mixture). The optimum H$$_{2}$$O-${it i}$PrOH composition was identified by the kinetic parameters including the initial polymerization rate (r$$_{p0}$$), the radical recombination rate ($$gamma$$) and the grafting efficiency (r$$_{p0}$$/$$gamma$$). These parameters changed depending on the VBC-grafting/chain-transfer reaction competition for the radicals on ETFE and the Trommsdorff effect; the swelling of the grafting substrate gave an additional effect.

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