| 초록 |
Among many silver salts capable of reversibly forming the silver-olefin complexes in silver polymer electrolytes, AgBF4 has commonly been employed because of its high carrier activity with respect to olefin molecules. However, AgBF4 is generally expensive and is easily converted to silver metal, resulting in the deactivation of the silver ion-olefin carrier activity. Therefore, it is desirable to use silver salts with high lattice energy such as AgNO3 in order to prevent the silver reduction, but AgNO3 is rather inactive as an olefin carrier. Because AgNO3 is known to exist in ionic aggregates form, the silver ions derived from AgNO3 can not easily form the silver-olefin complex. PEP was used to strongly perturb AgNO3 with high lattice energy to exist as free ions without any additives for the separation of olefin/paraffin mixtures. We suggest that the strong coordinative interaction between silver ion and two carbonyl oxygens from the phthalate group in PEP causes the interaction between Ag+ and NO3- to be weak, yielding the increased silver ion activity. The increased silver ion activity is verified by separation performance, FT-Raman spectroscopy and QCM. |
