Synchrotron-based FTIR microspectroscopy for the mapping of photo-oxidation and additives in acrylonitrile–butadiene–styrene model samples and historical objects |
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| Authors: | Daniela Saviello Emeline Pouyet Lucia Toniolo Marine Cotte Austin Nevin |
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| Institution: | 1. Politecnico di Milano, Dipartimento di Chimica Materiali e Ingegneria Chimica, Piazza Leonardo da Vinci, 26-20133 Milano, Italy;2. European Synchrotron Radiation Facility, Polygone Scientifique Louis Néel, 6 rue Jules Horowitz, F-38000 Grenoble, France;3. Laboratoire d’archéologie Moléculaire et Structurale, LAMS, UMR 8220, CNRS, F-75005 Paris, France;4. Consiglio Nazionale delle Ricerche – Istituto di Fotonica e Nanotecnologie (CNR–IFN), Dipartimento di Fisica, Politecnico di Milano, Piazza Leonardo da Vinci 32, Milano 20133, Italy |
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| Abstract: | Synchrotron-based Fourier transform infrared micro-spectroscopy (SR-μFTIR) was used to map photo-oxidative degradation of acrylonitrile–butadiene–styrene (ABS) and to investigate the presence and the migration of additives in historical samples from important Italian design objects. High resolution (3 × 3 μm2) molecular maps were obtained by FTIR microspectroscopy in transmission mode, using a new method for the preparation of polymer thin sections. The depth of photo-oxidation in samples was evaluated and accompanied by the formation of ketones, aldehydes, esters, and unsaturated carbonyl compounds. This study demonstrates selective surface oxidation and a probable passivation of material against further degradation. In polymer fragments from design objects made of ABS from the 1960s, UV-stabilizers were detected and mapped, and microscopic inclusions of proteinaceous material were identified and mapped for the first time. |
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| Keywords: | Synchrotron-Fourier transform infrared microspectroscopy Additives Acrylonitrile&ndash butadiene&ndash styrene Cultural heritage Polymer degradation Mapping |
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