Spectroscopic study of poly(ethylene terephthalate)/poly(amide‐6,6) blends

Fourier transform infrared (FT‐IR) studies of poly(ethylene terephthalate) (PET)/poly/(amide‐6,6) (PA) blends are presented. The blends were prepared in the molten state and in solution with trifluoroacetic acid (TFA) as the solvent. The PET/PA blend is a complex system containing, two crystallizable polymers with the ability to interact chemically. Some of the blends were prepared in the molten state in the presence of a catalytic amount of p‐toluenesulfonic acid (TsOH) to undergo the ester‐amide interchange reaction. Nuclear magnetic resonance (NMR) and FT‐IR have proven to be excellent techniques with which to study these blends. 1 HNMR was used to follow the ester‐amide interchange reaction and FT‐IR to detect the presence of hydrogen bonding. FT‐IR studies showed the lack of hydrogen bonding in all the blends prepared in the molten state and its presence in the blends prepared in solution.