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Fourier transform infrared (FT-IR) spectra of the polyimide films. OPI refers to a polyimide film where ODA:DABA = 10:0; 7O3DPI a film where ODA:DABA = 7:3; 5O5DPI a film where ODA:DABA = 5:5; 3O7DPI a film where ODA:DABA = 3:7; DPI a film where ODA:DABA = 0:10.
