Optical Properties of Methyl Green and Methyl Red Polycarbonate Films

Muhannad Sami Jalil, Asrar Abdulmunem Saeed, Farah Jawad Kadhum, Mahasin F. Hadi Al-Kadhemy


This research aimed to study the effect of incorporating additives (organic dyes) on the optical properties of polycarbonate (PC) films by investigating some of their optical constants. The casting method was chosen to prepare films from pristine PC mixed with either methyl green (MG) or methyl red (MR) in doping ratios of 5, 10, 15, 20, and 25 ml. The results showed that both the MG/PC and the MR/PC mixtures exhibited the same two absorption peaks as the pristine PC at wavelengths of 310 and 350 mm. The addition of the dyes did not shift the positions of the absorption wavelengths; however, the absorption coefficients, as peak values, of the mixtures were decreased, while the energy gaps were increased. This indicated that the dyes attenuated the conductivity of the PC.


Keywords: optical properties, organic dyes, polycarbonate polymer, doped dyes.



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