PLT and DBAR Investigations on MPDMAPP Doped PVA/PVP Blend

11th International Workshop on Positron and Positronium Chemistry

物理学;化学

Bhajantri, R.F.^1 ; Ravindrachary, V.^2 ; Lobo, Blaise^3 ; Pujari, P.K.^4 ; Rathod, Sunil G.^2 ; Naik, Jagadish^2 ; Hebbar, Vidyashree^1 ; Chandrappa, H.^1

Department of Physics, Kamatak University, Pavate Nagar, Dharwad, Karnataka

580 003, India^1

Department of Physics, Mangalore University, Mangalagangotri, Karnataka

574 199, India^2

Department of Physics, Karnatak Science College, Karnatak University, Dharwad, Karnataka

580 001, India^3

Radiochemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai, Maharashtra

400 085, India^4

关键词: 4-methylphenyl;    Chalcone derivatives;    Dopant concentrations;    Dopant levels;    Doping concentration;    o-Ps lifetime;    Solution-casting technique;    Vinyl pyrrolidone;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/618/1/012030/pdf
DOI  :  10.1088/1742-6596/618/1/012030

来源: IOP

【 摘 要 】

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 τ3is 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 I3. The S-parameter drops significantly from 0.1 wt% up to 1 wt% doping concentration. This is supported by the XRD scans.