Positron annihilation study of high impact polystyrene

Citation
N. Suzuki et al., Positron annihilation study of high impact polystyrene, RADIAT PH C, 58(5-6), 2000, pp. 593-596
Citations number
8
Categorie Soggetti
Physics
Journal title
RADIATION PHYSICS AND CHEMISTRY
ISSN journal
0969806X → ACNP
Volume
58
Issue
5-6
Year of publication
2000
Pages
593 - 596
Database
ISI
SICI code
0969-806X(200006)58:5-6<593:PASOHI>2.0.ZU;2-P
Abstract
Positron lifetime spectra for general purpose polystyrene (GPPS), polybutad iene rubber (PBR), and their copolymers, styrenebutadiene rubber (SBR) and high impact polystyrene (HIPS) have been measured. It has been found that t he free Volumes in the copolymers are smaller than the average over the ind ividual polymers, due to the interfacial interaction between the styrene an d rubber phases. A long-lived component with a mean lifetime of about 123 n s was observed in the spectrum for deformed HIPS, showing the existence of ortho-positronium (o-Ps) in the deformation induced crazes. (C) 2000 Elsevi er Science Ltd. All rights reserved.