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2001 | 99 | 3-4 | 429-433
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Effect of Annealing on Free-Volume Properties of Poly(ethylene Terephthalate) Studied by Positron Annihilation

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The effect of annealing on free-volume properties of poly( ethylene terephthalate) was studied using a set of samples annealed for two hours in air at eight temperatures between 80ºC and 220ºC. The fractional free-volume in the samples was estimated from ortho-positronium lifetime and its relative intensity. The variations of fractional free-volume and of the macroscopic specific volume with annealing temperature were compared. The variation of the pore volume probability density functions with the annealing temperature was found. The interdependence between S- and W-parameters was also discussed.
  • Faculty of Physics, Sofia University, 5 J. Bourchier Blvd., 1126 Sofia, Bulgaria
  • Institute for Nuclear Research and Nuclear Energy, Bulgarian Academy of Sciences, 72 Tzarigradsko shoosse Blvd., 1784 Sofia, Bulgaria
  • Faculty of Chemistry, Sofia University, 1 J. Bourchier Blvd., 1126 Sofia, Bulgaria
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