A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Siloxane-based polymers as protective coatings against SO2 dry deposition
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 was investigated. 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. Lotexan-N is a siloxane prepolymer substituted with methoxy, methyl and alkyl groups, dissolved in a mixture of aromatic/aliphatic hydrocarbon solvents. Silres BS 290 is a mixture of silanes and siloxanes, applied using white spirit as a solvent. Tegosivin HL 100 is a low molecular weight-modified polysiloxane resin (methyl-ethoxy-polysiloxane), applied in white spirit. The hybrid nanocomposite was obtained by combining the sol-gel technique and the radical polymerization of an alkoxysilane sol-gel precursor, namely 3-(trimethoxysilyl)propyl methacrylate, in the presence of a primary amine surfactant. 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. Due to its self-assembling properties, the TMSPMA nanocomposite bonds with the limestone and penetrates inside it deeper than the commercially available siloxane-based polymers.
Siloxane-based polymers as protective coatings against SO2 dry deposition
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 was investigated. 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. Lotexan-N is a siloxane prepolymer substituted with methoxy, methyl and alkyl groups, dissolved in a mixture of aromatic/aliphatic hydrocarbon solvents. Silres BS 290 is a mixture of silanes and siloxanes, applied using white spirit as a solvent. Tegosivin HL 100 is a low molecular weight-modified polysiloxane resin (methyl-ethoxy-polysiloxane), applied in white spirit. The hybrid nanocomposite was obtained by combining the sol-gel technique and the radical polymerization of an alkoxysilane sol-gel precursor, namely 3-(trimethoxysilyl)propyl methacrylate, in the presence of a primary amine surfactant. 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. Due to its self-assembling properties, the TMSPMA nanocomposite bonds with the limestone and penetrates inside it deeper than the commercially available siloxane-based polymers.
Siloxane-based polymers as protective coatings against SO2 dry deposition
Simionescu, Bogdana (author) / Olaru, Mihaela (author) / Aflori, Magda (author) / Doroftei, Florica (author)
High Performance Polymers ; 23 ; 326-334
2011
9 Seiten, 5 Bilder, 4 Tabellen, 23 Quellen
Article (Journal)
English
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