The research is focused on investigating the relative resistance of a monumental limestone (Repedea from Romania), protected with different siloxane-based polymeric coatings, used in north-eastern part of Romania for the construction of many stone monuments. Three worldwide used siloxane-based polymers, namely Lotexan-N, Silres® BS 290 and Tegosivin HL 100 and a newly designed hybrid nanocomposite containing silsesquioxane units (TMSPMA) were selected

A novel silver/polysulfone nanocomposite membrane was prepared by a convenient ultraviolet irradiation technique, through in situ reduction of silver salt (AgNO3) added to a solution of commercial UDEL polyethersulfone dissolved in N-methyl-2-pyrrolidinone (NMP). The UVreduction of Ag+ to Ag0 nanoparticles was confirmed by means of UV-vis spectroscopy, from aggregation phenomena. The effects of dispersion of silver nanoparticles within polysulfone

The aim of the study was to synthesize and characterize silsesquioxane-based hybrid nanocomposites with self-assembling properties to be used in monumental stone conservation. Through radical polymerization of 3-(trimethoxysilyl)propyl methacrylate, a monomer that contains both methacrylate and silica phases, in the presence of a primary amine surfactant, at different silica precursor:ethanol molar ratios, new types of hybrid nanocomposites, in which

The present study is concerned with the assessment of the relative resistance of a monumental dolomitic limestone (Laspra – Spain) used as building material in stone monuments and submitted to artificial ageing by SO2 dry deposition in the presence of humidity. To investigate the protection efficiency of different polymeric coatings, three commercially available siloxane-based oligomers (Lotexan-N, Silres BS 290 and Tegosivin HL 100) and a newly

The aim of this study was to synthesize and characterize new poly(vinyl alcohol)s (PVAs) hybrid composites with or without a basic drug content, e.g., 2-[4-(2-methylpropyl)phenyl]propanoic acid (ibuprofen), obtained at different pH values. Through sol-gel approach of chloropropyltriethoxysilane with a PVA precursor containing a fluorescent dye (lissamine rhodamine-B sulfonyl chloride), new hybrid materials with porous structures were obtained. Due