Characterization of Cation-exchange Membranes Prepared by Ion-track Graft Polymerization

抄録

We prepared novel cation exchange membranes（CEMs）by ion-track grafting of ethyl p-styrenesulfonate（EtSS）into a base fluoropolymer film and subsequent hydrolysis of EtSS units. At the ion-beam fluence of 1.0×10⁹ ions/cm², the grafting degree of EtSS was controlled in the range of 13.4 ％ - 75.1 ％ by changing the grafting time. The obtained CEMs showed the ion exchange capacity（IEC）ranging from 0.38 to 1.70 mmol/g. The water content of the CEMs increased with an increase in IECs. The membrane resistance of the CEM with the IEC of 1.70 mmol/g was 0.18 Ω cm², which was only around one tenth of that of a commercial CEM, Neosepta® CMX.