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1 Archives of Foundry Engineering

1 2010

1 Grabowska B.

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Thermal degradation of biopolymer binders: the example of starch-poly(acrylic acid)

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Grabowska B.

Archives of Foundry Engineering

2010

tom Vol. 10, iss. 1 spec.

221--224

To characterise a polymer, it is of fundamental importance to determine its parameters, like the temperatures of destruction, vitrification, melting point, specific mass losses or polymorphic transformations, which frequently determine the quality of the product and its applications. Thermal analyses were conducted of samples of a biopolymer binder: a starch-poly(acrylic acid) composition and a moulding sand with a biopolymer binder previously hardened with microwaves. In order to determine the thermal stability of the examined samples by determining the destruction temperature and the thermal effects of transformations taking place during heating, FTIR spectroscopy and thermal analysis (DSC, DTG, TG) methods were used. In addition, volatile products of degradation were analysed using the thermogravimetry (TG) method coupled online with mass spectrometry (MS). These examinations were also aimed at identifying the changes that can take place in the moulding sand when it comes into contact with liquid metal.