TG-DTG-DSC, FTIR, DRIFT and Py-GC-MS studies of thermal decomposition for poly(sodium acrylate)/dextrin (PAANa/D) – new binder BioCo3
TG-DTG-DSC, FTIR, DRIFT, and Py-GC-MS studies have been conducted to determine the effect of the thermal decomposition
conditions and structure of foundry binder BioCo3 in the form of a composition poly(sodium acrylate)/dextrin
(PAANa/D) on the progress of degradation in terms of processes occurring in foundry sands in contact with liquid metal.
TG-DTG-DSC curves of the composition allowed us to determine the temperature range in which they do not undergo
degradation, by which they do not lose their binding properties. With temperature increasing, physical and chemical
changes occur that are related to the evaporation of solvent water (20–110°C), followed by the release of constitution
water, and finally intermolecular dehydration (110–230°C). In this temperature range, processes that are mainly reversible
take place. Within a temperature range of 450–826°C, polymer chains are decomposed, including the decomposition
of side chains. Within a temperature range of 399–663°C, polymer composition decomposition can be observed (FTIR,
DRIFT), and gas products are generated from this destruction (Py-GC-MS).
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