Temperature dependent positron annihilation studies in Nafion-117 polymer

We have measured the S-parameter and life-time as a function of temperature from 15 to 300 K in acid Nafion-117. In addition, high temperature measurements from 300 to 550 K have been carried out in acid as well as Cs neutralised Nafion membrane. The results are discussed. (C) 2000 Elsevier Science Ltd. All rights reserved