PLT and DBAR Investigations on MPDMAPP Doped PVA/PVP Blend

[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.

[发布机构] 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

[效力级别] 化学

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