PLT and DBAR Investigations on MPDMAPP Doped PVA/PVP Blend. (May 2015)

• Record Type: Journal Article
• Authors: Bhajantri, R F; Ravindrachary, V; Lobo, Blaise; Pujari, P K; Rathod, Sunil G; Naik, Jagadish; Hebbar, Vidyashree; H, Chandrappa
• Is Part Of: Journal of physics. Number 618(2015)
• Publication Date: 2015-05
• Subjects: Physics -- Congresses; 530.5
• DOI: 10.1088/1742-6596/618/1/012030
• Languages: English
• ISSNs: 1742-6588

Abstract

Abstract: Poly(vinylalcohol) (PVA)/Poly(vinylpyrrolidone) (PVP) blend films, doped with chalcone derivative (1-(4-methylphenyl)-3-(4-N, N, dimethylaminophenyl)-2-propen-1-one) (MPDMAPP) from 0.025 wt% up to 1 wt% were prepared using solution casting technique. The o-Ps lifetime τ3 is found to change little, from 1.61 ns at 0.025 wt% dopant concentration to 1.63 ns at 0.5 wt% dopant level, but drops to 1.4 ns at 1 wt% dopant concentration, indicating the onset of phase separation. The S-parameter of DBAR was found to be linearly related to the ortho-Positronium(o-Ps) intensity I 3 . The S-parameter drops significantly from 0.1 wt% up to 1 wt% doping concentration. This is supported by the XRD scans.