Examining the thermal degradation of polymer binders using FTIR spectroscopy

• Autorzy: Grabowska B.
• Języki publikacji: EN

Abstrakty

EN

This article discusses the general theoretical basis for examining polymers using FTIR infrared spectroscopy. It presents results of research on using the FTIR to analyse the course of structural changes during the thermal degradation of polymer binders exemplified by a sodium salt of the maleic acid – acrylic acid copolymer. This polymer was selected for the research due to its structure (an aliphatic structure polymer) and its physical chemistry properties (polarity, presence of reactive COO- carboxylic groups). In addition, results of previous research on using acrylic polymers as binders for casting pastes have shown that they can be applied in casting technologies. Results of FTIR examinations were used to determine the structural changes resulting from the gradual degradation consisting in the progressive fragmentation of polymer chains, the formation of new, shorter hydrocarbon chains of various structural arrangements. It was found that the thermal degradation of the initial polymer starts at about 120°C. Examinations of the thermal degradation process are significant, particularly with reference to processes taking place in the casting paste when it comes into contact with liquid metal. In the case of casting paste whose matrix is formed of quartz sand and the binder is a sodium salt of the maleic acid/acrylic acid copolymer, the degradation process of the polymer in the paste starts at about 300°C, and at 450°C the destruction is practically complete.

Słowa kluczowe

EN

FTIR spectroscopy; thermal degradation; foundry polymer binders; casting paste

PL

spektroskopia FTIR; deformacja cieplna; spoiwa polimerowe

• Wydawca: Komisja Odlewnictwa Polskiej Akademii Nauk Oddział w Katowicach
• Czasopismo: Archives of Foundry Engineering
• Rocznik: 2010
• Tom: Vol. 10, iss. 4
• Strony: 43--46
• Opis fizyczny: Bibliogr. 9 poz., tab., wykr.

Twórcy

autor

Grabowska B.

• AGH University of Science and Technology, Faculty of Foundry Engineering, Chair of Casting Process Engineering, Reymonta 23 str., 30-059 Kraków, Poland

Bibliografia

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• [4] Grabowska B.: Thermal degradation of biopolymer binders: the example of starch-poly(acrylic acid). Archives of Foundry Engineering 2010 vol. 10 spec. iss. 1 pp. 221–224.
• [5] Grabowska B., Holtzer M., Bobrowski A.: Application of the FT-IR method for investigating the cross-linking of sodium salt of copolymer maleic acid-acrylic acid of microwave radiation 51 Conference of PTChem and SITPChem, 7–11 September 2008, Opole.
• [6] Grabowska B., Hajos M.: Application of sodium salt copolymer maleic acid-acrylic acid as binders for moulding sands, Nowoczesne technologie w odlewnictwie: XXXII Scientific Conference on the National Foundryman Day 2008: Kraków, 12 September 2008 pp. 193–198.
• [7] Young A.M., Rafeeka S.A., J.A. Howlett: FTIR investigation of monomer polymerisation and polyacid neutralisation kinetics and mechanisms in various aesthetic dental restorative materials, Biomaterials 25, 2004, pp. 823-833.
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• [9] Grabowska B., Holtzer M.: Application of spectroscopic methods for investigation of the course of poly(sodium acrylate) crosslinking with use of different crosslinking agents, Polimery 2008 vol. 53 iss. 7–8 pp. 531–536.