Legan, Lea
Retko, Klara
Penko, Ana
Kavčič, Maša
Knez, Friderik
Ropret, Polonca
2019-05-07
<p>Fire disasters can pose a great threat to cultural heritage objects. The consequences of fire flames<br>
and fire effluents (FE) are almost always disastrous and still represent uncertainty regarding how and to<br>
what extent they affect the environment. Furthermore, their negative effect can continue long after the fire<br>
has been extinguished. The fire behaviour can nowadays be monitored by different devices, such as cone<br>
calorimeter (ISO-5660), smoke density chamber (ISO-5659), etc.<br>
In this work, we employed bench-scale test in order to study the influence of FE on the<br>
proteinaceous paint layers. Two sets of model samples (one containing lead white-egg yolk tempera paints<br>
and the other pure egg yolk binder applications) were prepared to follow and to better understand the overall<br>
fire impact (i.e., effects of temperature and FE). Untreated spruce was selected as burning material. Model<br>
samples were placed in special chambers (influence of FE) and in a special designed holder mounted on<br>
top of the cone calorimeter stack (influence of FE and increased temperature) during the exposure to FE.<br>
Overall experiment lasted approximately 20 minutes, while the temperature on top of the stack varied<br>
between 200 and 400 °C. Furthermore, the design of the experiment allowed the investigation of exposure<br>
time. Molecular changes of exposed samples have been investigated by non-invasive reflection and<br>
conventional FTIR, and Raman spectroscopy, while the colour change was evaluated by colourimetry. The<br>
latter increased in relation to time of exposure due to either paint degradation, adsorption of effluents and/or<br>
deposition of soot. The most significant changes were determined for the samples, exposed for longer<br>
times. The appearance of additional IR band placed at 1,529 cm–1 suggested the presence of iminium ion,<br>
which can form when protonated formaldehyde, generated by burning process of wood, react with protein<br>
amine group [1]. Moreover, other alteration products such as lead oxide, were also detected.</p>
https://doi.org/10.5281/zenodo.3751016
oai:zenodo.org:3751016
https://doi.org/10.5281/zenodo.3751016
Zenodo
https://zenodo.org/communities/innorenew
https://zenodo.org/communities/eu
https://doi.org/10.5281/zenodo.3751015
info:eu-repo/semantics/openAccess
Creative Commons Attribution 4.0 International
https://creativecommons.org/licenses/by/4.0/legalcode
Technart 2019, University of Antwerp, Flemish Research Centre for the Arts, 7-10 May, 2019
Study of the influencing effect of fire effluents on the proteinaceous paint layers
info:eu-repo/semantics/conferencePoster