Abstract
Iodine sorption characteristics of poly(ethyleneterephthalate) have been studied through free volume changes by the positron annihilation lifetime (PAL) technique. The results show swelling of the polymer, charge transfer complex (CTC) formation in the initial stages and precipitation of iodine in the final stages of sorption. Additionally, the results suggest a conformational transformation in the amorphous region of the polymer in the final stages of sorption which is in agreement with the earlier predictions. It is also revealed that iodine acts more as an inhibitor than a quencher of the o-Ps. The average free volume size suggests that the predominant species which fills the free volume holes during iodine sorption is I 3 −. The sorption in PET obeys Case II diffusion. Furthermore, the study shows that Fujita's free volume theory, which relates the fractional free volume and diffusion coefficient, deviates.
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