Praveena, S D and Ravindrachary, V and Ismayil, . and Bhajantri, Rajashekhar F and Harisha, A and Guruswamy, . and Hegde, Shreedatta and Sagar, Rohan N (2017) Inhibition and Quenching Effect on Positronium Formation in Metal Salt Doped Polymer Blend. In: Dae solid state physics symposium 2017, 26/12/2017, BARC, Mumbai, India.

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Abstract

Sodium Bromide (NaBr) doped PVA/PVP (50:50) polymer blend composites were prepared using solution casting technique. Pure PVA/PVP blend and PVA/PVP:NaBr composites were studied using XRD and Positron Annihilation Lifetime Spectroscopy (PALS). XRD study shows increase in amorphous nature of the blend due to the NaBr dopant and PALS studies reveal that the o-Ps lifetime (τ3) and intensity (I3) decreases with increase in NaBr doping level. This shows chemical quenching and inhibition process of positronium (Ps) formation in the composite. Here the electron acceptor (Br-) acts as a strong chemical quencher for positronium formation and same is understood based on the spur model.

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