title: Synchrotron-based FTIR microspectroscopy for the mapping of photo-oxidation and additives in acrylonitrile-butadiene-styrene model samples and historical objects.
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 μm(2)) 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.
authors.affiliation: Politecnico di Milano, Dipartimento di Chimica Materiali e Ingegneria Chimica, Piazza Leonardo da Vinci, 26-20133 Milano, Italy. Electronic address: daniela.saviello@polimi.it.
authors.forename: Daniela
authors.initials: D
authors.lastname: Saviello
authors.affiliation: European Synchrotron Radiation Facility, Polygone Scientifique Louis Néel, 6 rue Jules Horowitz, F-38000 Grenoble, France.
authors.forename: Emeline
authors.initials: E
authors.lastname: Pouyet
authors.affiliation: Politecnico di Milano, Dipartimento di Chimica Materiali e Ingegneria Chimica, Piazza Leonardo da Vinci, 26-20133 Milano, Italy.
authors.forename: Lucia
authors.initials: L
authors.lastname: Toniolo
authors.affiliation: European Synchrotron Radiation Facility, Polygone Scientifique Louis Néel, 6 rue Jules Horowitz, F-38000 Grenoble, France; Laboratoire d'archéologie Moléculaire et Structurale, LAMS, UMR 8220, CNRS, F-75005 Paris, France.
authors.forename: Marine
authors.initials: M
authors.lastname: Cotte
authors.affiliation: 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.
authors.forename: Austin
authors.initials: A
authors.lastname: Nevin
keywords: Acrylonitrile–butadiene–styrene; Additives; Cultural heritage; Mapping; Polymer degradation; Synchrotron-Fourier transform infrared microspectroscopy