On the characterization of glassy polymers by positron annihilation lifetime spectroscopy
作者： Kenneth J. Heater , Phillip L. Jones
DOI: 10.1016/0168-583X(91)96107-V
关键词: Characterization (materials science) 、 Spectroscopy 、 Polymer 、 Temperature cycling 、 Relaxation (physics) 、 Nuclear magnetic resonance 、 Chemical physics 、 Thermal 、 Polycarbonate 、 Materials science 、 Glass transition
摘要: Abstract The present paper reviews some of our recent results exemplifying the use positron annihilation lifetime spectroscopy in evaluating effects thermal history on physical properties glassy polymers. Specifically, studies cycling, aging and structural relaxation polycarbonate are discussed. It is shown that ortho-positronium pickoff component intensity I 3 sensitive to transitions below glass transition response a parameter can be used study thermodynamics kinetics relaxation.
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