Biodegradation of new polymer foundry binders composition of poly(acrylic acid)/dextrin

Abstract

Biodegradation of new polymer foundry binders composition of poly(acrylic acid)/dextrin **) Summary -Investigations were carried out focusing on novel polymeric binders and their susceptibility to biodegradation. As an example a water-soluble composition of poly(acrylic acid)/dextrin is presented. Determination of the total oxygen demand for biodegradation has been accomplished under laboratory conditions, in accordance with the static water test system (the Zahn-Wellens method). In that system the mixture in which the biodegradation takes place contains activated sludge as the inorganic nutrient and the investigated polymeric composition designed to be the exclusive source of carbon and energy. The progressively increasing biodegradation has been tested by means of the chemical oxygen demand and by the simultaneously determined degree of biodegradation R t . These investigations have proven the poly(acrylic acid)/dextrin composition to be a material fully biodegradable in water. This statement is justified by degree of biodegradation R t = 65 % which occurred on the 28th day of testing. At the same time a separate sample of the crosslinked polymeric composition was tested on the biodegradation resulting from storing the sample for over 6 months in garden soil. During that time several analyses were performed by means of the Raman spectroscopy, optical microscopy and atomic force microscopy (AFM). The intention was to study structural changes on surfaces resulting from the degradation.

Identification of Yield Point of Polymer-Based Composite Material in the Conditions of Increased Temperatures

“…It means that the polymeric material broach is unsuitable for use at high temperatures or in poorly loaded knots. At the increasing temperature polymeric material practically does not increase in volume [10][11][12][13].…”

Testing the Tensile Strength of Samples Made From a Composite Material Stahl 1018 Applied to the Steel Surface

“…The filler materials, i.e. steel, ceramics and additives improving surface tension exhibit high chemical resistance (Królikowski, 2020), (Konopka et al, 2017), (Grabowska et al, 2012), (Lelito et al, 2015). Authors have already performed a series of experiments and analyses of the effect of temperature on compressive strength, measurement of microhardness, impact strength, tribological properties and microstructure analyses (Arustamian et al, 2016, Arustamian et al, 2020 .…”

FT-IR and FT-Raman studies of cross-linking processes with Ca2+ ions, glutaraldehyde and microwave radiation for polymer composition of poly(acrylic acid)/sodium salt of carboxymethyl starch – In moulding sands, Part II

“…In addition, this binder should be subjected to ecological estimations including analysis of gaseous destruction products [8]. Environmental investigations related to biodegradation of polymer binders [9], as well as to elution of harmful substances from spent sands, remained after being poured with liquid metal, are also recommended [10,11].…”