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

Abstract

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. '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.

Synthesis and properties of reactively compatibilized polyester and polyamide blends

“…Examination of FTIR spectrum of the blend without compatibilization does not reveal any absorption band in the 3400 cm À1 region representative of non-bonded amide groups, whereas after adding PBT-g-MA the broad shoulder and the peak represent bonded NH stretching due to the compatibilization reaction during the blending process. Similar effects were observed by Pillon and Utracki 18 when blending PET and PA66 in the presence of catalytic amounts of p-toluenesulfonic acid. It is interesting to note the breadth of the band in the spectrum of compatibilized blend.…”

Strategies for compatibilization of polymer blends

“…[114] Transamidation reactions between two PAs have been studied by, for example, Kricheldorf, [115,116] whereas Kotliar [117] has written an excellent general review paper on interchange reactions involving condensation polymers. The work by Pillon and Utracki [118,119] nicely demonstrates the efficiency of compatibilization by (limited) interchange reactions. Equimolar blends of PET and PA 6.6 were prepared in a twin screw extruder.…”

Identification of polymers in waste tyre reinforcing fibre by thermal analysis and pyrolysis

“…Yet other authors have suggested that due to the chemical structure of the PET and PA, the interaction could be a consequence of the formation of hydrogen bonding between the carbonyl group in PET and the hydrogen in the amide group in PA [35].…”