Abstract
La microstructure specifique des chaines de PCV influence fortement l'organisation morphologique du polymere. Un traitement thermique realise a des temperatures superieures a la temperature de transition vitreuse (Tg) induit des modifications de cette organisation. Pour etudier l'influence de ces traitements sur le comportement de fibres non etirees de PVC nous avons eu recours a la technique des sondes paramagnetiques en RPE. Les resultats obtenus montrent clairement que la sonde choisie diffuse a la temperature ambiante, dans deux zones, a caractere amorphe, de morphologies differentes
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