Abstract
The present research was focused on investigating the ability of different siloxane-based polymeric coatings to provide environmental protection to monumental limestone (Repedea from Romania) used in the north-eastern part of Romania for the construction of many stone monuments. Three siloxane-based polymers used throughout the world in protecting stone monuments, namely Lotexan-N, Silres® BS 290 and Tegosivin HL 100 and a newly designed hybrid nanocomposite containing silsesquioxane units (TMSPMA) were selected as polymeric coatings. The ability of the coatings to protect the stone from dry SO2 deposition in the presence of humidity in a standardized accelerated ageing test was determined. A comparative study of the obtained results indicates that the stone samples treated with the new hybrid siloxane-based nanocomposite exhibited improved resistance to degradation after being exposed to a SO2 saturated atmosphere.
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