| 초록 |
Ion-exchange membrane is commonly used as the electrolyte of ionic polymer metal composites (IPMCs). Ion–exchange membrane in IPMCs maintains its shape and functions as a pathway of hydrated mobile cations. So the performance of IPMCs can be largely affected by the properties of the membrane. All IPMCs known to us have been restricted to some commercial ion-exchange membranes such as Nafion and Flemion. Therefore, the performance of IPMCs is limited. To solve this problem, new ion-exchange membrane development is needed. Radiation grafting method has frequently been used to manufacture ion-exchange membranes. Typically, radiation grafting method involves three steps. First a fluoropolymer is irradiated with γ-ray. Second the irradiated polymer is grafted with monomer. Third the grafted polymer is functionalized. The method has various advantages. Manufacturing process is convenient, the degree of grafting can be controlled, and production cost is low. In this study, new ion-exchange membranes were prepared by radiation grafting. Poly(vinylidene fluoride-co-hexafluoropropylene) (P(VDF-co-HFP)), poly(tetrafluoroethylene-co-hexafluoropropylene) (FEP) and poly(ethylene-co-tetrafluoroethylene) (ETFE) were used as initial matrix. Styrene and acrylic acid were used as monomers. The ion-exchange capacity (IEC), the water uptake and the conductivity of the ion-exchange membranes were measured. IPMCs made of new ion-exchange membranes were tested with laser displacement meter. |
