[en] Because PU coatings offer a compromise between aesthetic and performance expectations, unachievable with other types of industrial paints, they are currently recognized as the most appropriate option to coat sculptures intended for an outdoor setting. However, the PU class includes various systems, such as two package solvent-borne, two package water-borne, one package water-borne and fluoropolymer polyurethanes, which possess very different properties. 115 reference samples of PU coatings were investigated by means of Py-GC/MS, in order to outline the differences and the similarities existing, in terms of composition, between the major PU systems used for creating as well as for conserving modern painted outdoor sculptures. The Py- GC/MS study of an extended number of reference samples showed that the composition of equivalent PU systems strongly varies depending on the product line and the manufacturer. Furthermore the comparison of all the produced pyrograms allowed defining characteristic marker compounds helpful to discriminate specific PU paint systems.
Research Center/Unit :
CEA - Centre Européen en Archéométrie - ULiège AAP - Art, Archéologie et Patrimoine - ULiège
Disciplines :
Physical, chemical, mathematical & earth Sciences: Multidisciplinary, general & others Arts & humanities: Multidisciplinary, general & others
Author, co-author :
Defeyt, Catherine ; Université de Liège > Département de physique > Spectroscopie atomique et nucléaire, archéométrie
Schilling, Michael; Getty Conservation Institue
Langenbacher, Julia; Getty Conservation Institute
Escarsega, John; Getty Conservation Institute
Rivenc, Rachel; Getty Conservation Institute
Language :
English
Title :
Polyurethane coatings in 20th century outdoor painted sculptures. Part II: Comparative study of four systems by means of Py-GC/MS
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