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Title: Protection of marble surfaces by using biodegradable polymers as coating agent
Authors: Ocak, Yılmaz
Sofuoğlu, Aysun
Tıhmınlıoğlu, Funda
Böke, Hasan
Keywords: Air pollution
Biodegradable polymers
Plastic coatings
Issue Date: Nov-2009
Publisher: Elsevier
Source: Ocak, Y., Sofuoğlu, A., Tıhmınlıoğlu, F., and Böke, H. (2009). Protection of marble surfaces by using biodegradable polymers as coating agent. Progress in Organic Coatings, 66(3), 231-220. doi:10.1016/j.porgcoat.2009.07.007
Abstract: Biodegradable polymers have been replaced over the synthetic polymers in many applications due to their good properties such as reversibility and biodegradability. Therefore they allow new treatment on the surface of the material to be protected and they fulfil the principles generally accepted by the International Conservation Community of Historic Monuments and Buildings. In this study, the efficiency of four different biodegradable polymers as protective coatings on marble-SO2 reaction was investigated. The polymers used were zein, chitosan, polyhydroxybutyrate (PHB), and poly-l-lactide (PLA). The mineralogical composition, bulk density and porosity of uncoated marble were determined. The water vapor permeability, water absorption by capillary forces, surface wettability, and color alteration of uncoated and coated marbles were measured. For sulphation reaction, marble slabs were coated with these polymers and then they were exposed at nearly 8 ppm SO2 concentration at 100% relative humidity conditions together with uncoated ones in a reaction chamber for several days for testing their protection efficiency. The extent of reaction was determined by leaching of gypsum formed on the marble surfaces in deionized water and then determining the sulphate content by ion chromatography. The protection efficiency of polymer treatments was expressed as comparing the gypsum crust thickness of the coated and uncoated marble plates. The comparison among the polymers showed that the surface hydrophobicity, water capillary absorption and structure of polymer would be important factors affecting the protection efficiency. The use of high molecular weight PLA (HMWPLA) polymer on marble surfaces provided significant protection up to 60% which was indicated that HMWPLA polymer seems to be promising polymer as protective coating agent in reducing gypsum formation on marble surfaces in the polluted environment.
ISSN: 0300-9440
Appears in Collections:Chemical Engineering / Kimya Mühendisliği
Conservation and Restoration of Cultural Heritage / Kültür Varlıklarını Koruma ve Onarım
Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection
Sürdürülebilir Yeşil Kampüs Koleksiyonu / Sustainable Green Campus Collection
WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection

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