Characterization of a Water-Dispersible Metal Protective Coating with Fourier Transform Infrared Spectroscopy, Modulated Differential Scanning Calorimetry, and Ellipsometry

Author:

Boyatzis Stamatis C.1,Douvas Antonios M.1,Argyropoulos Vassilike1,Siatou Amalia1,Vlachopoulou Marilena1

Affiliation:

1. Technological Educational Institute of Athens, Department of Conservation of Antiquities & Works of Art, Egaleo 12210, Greece (S.C.B., V.A., A.S.); and Institute of Microelectronics, National Center for Scientific Research “Demokritos”, 15310 Aghia Paraskevi, Greece (A.M.D., M.V.)

Abstract

An ethylene-methacrylic acid copolymer, formulated by BASF as a waterborne suspension of its alkylammonium salt and used, among other applications, in art conservation as a temporary protective coating was characterized using Fourier transform infrared (FT-IR) spectroscopy aided by modulated differential scanning calorimetry (MDSC) and ellipsometry. The thermal conversion of thin copolymer films from the freshly applied state, where carboxylic acid and carboxylate ion functional groups co-exist, to a purely acidic working state was spectroscopically followed. Transmission mid-infrared data of the working state showed a 1 : 12 ratio of methacrylic acid towards ethylene units. The glass transition temperature ( Tg) in the same state was found at 45 °C. Copolymer films spin-coated on mechanically polished bronze and iron coupons were characterized with transflection infrared spectroscopy and compared to corresponding transmission mid-infrared spectra of copolymer films spin-coated on silicon wafers. In the case of bronze coupons, evidence for interaction of the carboxylate ion with the copper substrate was obtained. The chemical structure and the thermal behavior of the coating, as well as some implications on its protective capability towards iron and copper alloys, is discussed as this material has received considerable attention in the field of metal conservation and coatings.

Publisher

SAGE Publications

Subject

Spectroscopy,Instrumentation

Reference49 articles.

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