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Title: Non-invasive methodology for the identification of plastic pieces in museum environment – a novel approach
Authors: Pereira, António
Candeias, António
Cardoso, Ana
Rodrigues, Denis
Vandenabeele, Peter
Caldeira, A Teresa
Keywords: Cellulose acetate
Cellulose nitrate
Non-invasive methodology
NMR spectroscopy
Plastic pieces
Issue Date: 2016
Publisher: Elsevier
Citation: Antonio Pereira; Antonio Candeias; Ana Cardoso; Denis Rodrigues; Peter Vandenabeele; A.Teresa Caldeira (2016). Non-invasive methodology for the identification of plastic pieces in museum environment – a novel approach. Microchemical Journal 124 846–855 DOI:10.1016/j.microc.2015.07.027.
Abstract: The preservation of modern and contemporary art and costume collections in museums requires a complete understanding of their constituent materials which are often synthetic or semi-synthetic polymers. An extraordinary amount of quality information can be gained from instrumental techniques, but some of them have the disadvantage of being destructive. This paper presents a new totally integrated non-invasive methodology, for the identification of polymers and their additives, on plastic artefacts in museums. NMR (nuclear magnetic resonance) and in-situ FTIR-ATR (attenuated total reflection infrared spectroscopy) combination allowed the full characterization of the structure of thesematerials and correct identification of each one. The NMR technique applied to leached surface exudates identified unequivocally a great number of additives, exceeding the Py–GC–MS analysis of micro-fragments in number and efficiency. Additionally, in-situ FTIR-ATR provided exactly the same information of the destructive μ-FTIR about the polymer structure and confirmed the presence of some additives. Eight costume pieces (cosmetic boxes and purses), dating to the beginning of the 20th century and belonging to the Portuguese National Museum of Costume and Fashion, were correctly identified with this new integrated methodology, as beingmade of plastics derived fromcellulose acetate or cellulose nitrate polymers, contradicting the initial information that these pieces were made of Bakelite. The identification of a surprisingly large number of different additives forms an added value of this methodology and opens a perspective of a quick and better characterization of plastic artefacts in museum environments.
Type: article
Appears in Collections:HERCULES - Publicações - Artigos em Revistas Internacionais Com Arbitragem Científica

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