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2 Archives of Foundry Engineering

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The estimation of ability to reclame of moduling sands with biopolymer binders

100%

Major-Gabryś K. , Dobosz S. M. , Dańko R. , Jakubski J.

2011

tom Vol. 11, iss. 2

79-84

Applied up till now organic binding materials, on the basis of synthetic resins are characterised by good technological properties, but cause high emission of harmful substances. That's why contemporary scientific researches are leading to progressive replacing the binders obtained from petrochemical materials with polymer biocomposites coming from renewable resources. Increasing concern of aliphatic polyesters such as polylactide, polycaprolactone, poly(hydroxyalkanoates) and aliphatic-aromatic polyesters is caused by the possibility of using them for producing many biodegradable products. In that context it is important to expand the researches connected to using biopolymers as moulding sands binders. Contemporary authors' papers were focused on technological properties and harmfulness for the environment of this ecological moulding sands. This article takes into consideration the ability to reclamation of moulding sands with biopolymer binders.

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

100%

Grabowska B.

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.