onic conductivity of epoxy resin -polyethylene glycol (PEO400) interpenetrating polymer netword(IPN) containing sodium perchlorate salt betWeen 15-70 ℃ under pressure from 0 to 40 MPa were investigated. The conductivity maximum exists near 6 MPa on conductivity versus pressure curve for there amorphous films. Over 6 MPa pressure the conductivities decreased further with increasing pressure. The effect of pressure on the achvation volume is determined. These were compared with those of IPN containing lithium perchlorate. For pressure dependence of conductivity and activation volume

a microscopic explanation was obtained by considering the iondipole interaction and the re-sults indicated the ion micropassage in polymer ion conductor was effected by mobile ion size. The less ion radius is

the more effective on passages is and the greaster conductivity changes are.