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Positron annihilation study of iodine sorption in acrylonitrile–butadiene–styrene

✍ Scribed by R. Ramani; P. Ramachandra; G. Ramgopal; C. Ranganathaiah

Publisher
John Wiley and Sons
Year
1998
Tongue
English
Weight
181 KB
Volume
68
Category
Article
ISSN
0021-8995

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✦ Synopsis

The influence of iodine on the free volume of acrylonitrile-butadiene-styrene (ABS) was investigated by positron annihilation lifetime spectroscopy (PALS).

The results indicate the filling of free-volume holes, formation of a positronium-iodine compound (PsI 2 /PsI), and possible charge-transfer complexes (CTCs) in the initial stages and the swelling of iodine in the final stages of sorption. The present study also revealed that iodine acts as a chemical quencher of o-Ps. The average size of the free volume suggests that I 0 3 is the predominant species that fills up the free-volume holes during iodination. The diffusion process in the present case shows non-Fickian behavior and deviates from Fujita's free-volume concept as far as the fractional free volume and diffusion coefficient are concerned.

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