A pyrolysis approach for characterizing and assessing degradation of polyurethane foam in cultural heritage objects
| Autor: | Greta Biale, Maria Perla Colombini, Barbara Ferriani, Jacopo La Nasa, Francesca Modugno |
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| Rok vydání: | 2018 |
| Předmět: |
Materials science
Evolved gas analysis Polyurethane foams 02 engineering and technology Mass spectrometry 01 natural sciences Analytical Chemistry chemistry.chemical_compound Polypropylene glycol Chemical Engineering (all) Polyurethane chemistry.chemical_classification Analytical pyrolysis Chemistry (all) 010401 analytical chemistry Plasticizer Cultural heritage objects Degradation processes Polymer 021001 nanoscience & nanotechnology 0104 chemical sciences Fuel Technology Chemical engineering chemistry Degradation (geology) 0210 nano-technology Pyrolysis |
| Zdroj: | Journal of Analytical and Applied Pyrolysis. 134:562-572 |
| ISSN: | 0165-2370 |
| DOI: | 10.1016/j.jaap.2018.08.004 |
| Popis: | Specific analytical tools are needed to investigate the composition and degradation processes of the synthetic materials in the cultural heritage, and recent advancements in pyrolysis-based analytical techniques have great potential for the characterisation of synthetic polymers. We applied evolved gas analysis mass spectrometry (EGA-MS) and double shot pyrolysis coupled with chromatography and mass spectrometry (Py-GC/MS) to investigate polyurethane foam micro-samples from the Italian pop-art sculpture “Contenitoreumano n.1” (1968) by Ico Parisi (1916–1996) and Francesco Somaini (1926–2005). The chemical analysis aimed to assess the chemical composition and of the state of preservation of the PU foam by acquiring information on its thermal degradation behaviour and identifying the pyrolysis products produced at different temperatures. A preliminary ATR-FTIR analysis was also carried out. The multi-analytical approach enabled us to identify the isocyanate and polyol precursors as 2,6-toluenediisocyanate and polypropylene glycol, respectively. The plasticizers used in the production of the PU foam were also identified in the first shot of a double shot Py-GC/MS experiment. A comparison of a sample of better preserved foam with a sample of degraded foam from the surface of the object highlighted that the more degraded part of the PU foam featured an increase in the thermal degradation temperature of the soft-fragments of the PU network, related to cross-linking phenomena. Moreover, loss of plasticizers and formation of NH2 functional groups was observed in the degraded foam. |
| Databáze: | OpenAIRE |
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