简介：PositronannihilationtechniquewasusedtostudythemicellebehaviorsoftwoSBStriblockcopolymersinMEKsolventatdifferenttemperatures.Annihilationlifetimeτ3ofortho-positronium（o-Ps）exhibitedanobvioustransitionfromshorterlifetimetolongerlifetimewithtemperature.ItwasattributedtothechangeofmicellebehaviorofSBScopolymermoleculesinthesolution.Experimentalresultsofsedimentationvelocityofultracentrifugewerealsoreported.
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