Thermal decomposition of acrylamide from polyacrylamide

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  • Time-resolved pyrolysis with ion-attachment mass spectrometry

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Ion-attachment mass spectrometry with a tem- perature-programed direct probe allows the detection of intact pyrolysis products. It, therefore, offers the opportu- nity to monitor directly thermal byproducts on a real-time basis and potentially to detect thermally unstable products. With this technique, we investigated the thermal decom- position of polyacrylamide (PAA). Pyrolysis of PAA at around 450 C produces many products (e.g., amides, imides, nitriles, ketones, aldehydes, and acrylamide oligo- mers). Acrylamide, which is a possible carcinogen, is produced abundantly in various industries, and, therefore, continues to be a cause for concern. We also investigated the kinetics of the thermal decomposition of PAA, and observed that the degradation of acrylamide obeys Arrhe- nius kinetics, which allowed us to correlate the rate con- stant with the absolute temperature and the activation energy. The activation energy of thermal decomposition was calculated from selected ion-monitoring curves of acrylamide.

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