J. Phys. IV France 125 (2005) 387-390
Photoacoustic Characterization of PC/PMMA blends doped with Eu(acac)3D.T. Dias1, R. Bonzanini2, A.F. Rubira2, E.C. Muniz2, A.N. Medina1, M.L. Baesso1, L.A.O. Nunes3 and A.C. Bento1
1 Departamento de Física, Universidade Estadual de Maringá, Av. Colombo 5790, Maringá-Paraná 87020-900, Brazil
2 Departamento de Química, Universidade Estadual de Maringá, Av. Colombo 5790, Brazil
3 Instituto de Física de São Carlos, Universidade de São Paulo, São Carlos, SP, Brazil
Samples of PC/PMMA blend having proportion 6/4, 4/6 and 2/8 were doped with acetyl-acetonate of Eu(acac)3 having concentrations of 0-16%. Through Photoacoustic Spectroscopy (PAS) the interaction of Eu3+ with the blends was studied using the visible range 200-530 nm, monitoring a wide absorption band from 280 to 320 nm, where results pointed that 2/8 blend presents the highest absorption. Preliminary luminescent emission showed higher emission for lower Eu(acac)3 amounts and suggests that the 2/8 blend as more efficient at 615 nm. In addition, it is presented a study of thermal diffusivity and heat capacity evolution related to the doping amount for all blend proportions. Normalized thermal diffusivity is higher for 2/8 blend ( cm2s-1) and the specific heat was almost constant (c Jg-1K-1).
© EDP Sciences 2005