Unveiling the composition of historical plastics through non-invasive reflection FT-IR spectroscopy in the extended near- and mid-Infrared spectral range
| Autor: | Annalisa Chieli, Emma Richardson, Laura Cartechini, Costanza Miliani, Rafaela Trevisan, Michela Ciabatta, Barbara Ferriani, Aldo Romani, Francesca Rosi, Peter Gardner |
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| Rok vydání: | 2021 |
| Předmět: |
Kramers–Kronig relations
Overtone Chemical composition Conservation 02 engineering and technology 01 natural sciences Biochemistry Spectral line Analytical Chemistry chemistry.chemical_compound Optics Environmental Chemistry Polymer Spectroscopy chemistry.chemical_classification Chemistry business.industry 010401 analytical chemistry 021001 nanoscience & nanotechnology Design objects 0104 chemical sciences Characterization (materials science) Heritage science Reflection (physics) Polystyrene 0210 nano-technology business |
| Zdroj: | Analytica Chimica Acta. 1169:338602 |
| ISSN: | 0003-2670 |
| DOI: | 10.1016/j.aca.2021.338602 |
| Popis: | The present research exploits the strengths of external reflection FT-IR spectroscopy to non-invasively study heritage plastic objects through inspection, for the first time, of the wide spectral range including the near- and mid-IR (12500-350 cm−1). Unlike most of previous works on historical plastic objects, reflection-mode spectra were not corrected for the unfamiliar surface reflection profiles to the more recognizable absorption-like band shapes. This avoided data misinterpretation due to ill-suited Kramers Kronig correction when volume reflection is also present or when highly absorbing IR compounds generate Reststrahlen bands. The inspection of the enlarged spectral range allowed the detection of fundamental, combination and overtone bands which provided reliable identification and semi-quantitative characterization of different polystyrene-based co-polymers. Furthermore the variation of the plastic optical properties across the explored spectral range allowed us to sample the plastic materials to different depths in the mid- and near-IR regions, so as to probe the chemistry at the surface and in the plastic bulk, respectively, in a non-invasive manner. This proved particularly useful to observe spectral markers of surface degradation occurring in historical ABS-based polymers. |
| Databáze: | OpenAIRE |
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