AP01015 Extracting the Free Volume and Hole Fraction of Based Polymers under Positron Annihilation Lifetime Spectroscopy Technique

Abstract

In this study, the polymer structures of PMMA, SAN and SMA polymers were examined from bulk to surface by positron energy. The polymers were analyzed by Positron Annihilation Lifetime Spectroscopy (PALS), the latest technique for studying the structure of polymers. The most important parameters of PALS technique are orthopositronium lifetime τ₃ (o-Ps) and orthopositronium intensity I₃ (o-Ps), These parameters help us to measuring the free volumes and hole fraction of the polymers, these physical parameters play important role in innovation new polymers. The free volume and holebility ratio measured with the PALS technique as a function of electronic density. The minimum and maximum values of free volume were determined in PMMA and SAN, the minimum and maximum values of holebility ratio were determined in SMA and PMMA respectively.