title: Interactions between nanostructured calcium hydroxide and acrylate copolymers: implications in cultural heritage conservation.
abstract: The interactions between an acrylic copolymer, poly ethylmethacrylate/methylacrylate (70:30) (Poly(EMA/MA), and Ca(OH)2 nanoparticles were investigated in order to establish the reciprocal influence of these two compounds on their peculiar properties. The carbonation kinetics of Ca(OH)2 nanoparticles by atmospheric CO2 was investigated by FTIR and SEM measurements and compared to that of a nanocomposite film. CaCO3 formation occurred even in the presence of the copolymer, but only after an induction period of ca. 200 h and with a lower reaction rate. Some implications in cultural heritage conservation dealing with application of nanolime on artifacts previously treated with acrylic copolymers were discussed. Contact angle measurements, mechanical cohesion properties, and water vapor permeability allowed us to conclude that the optimum behavior of nanolime with respect to transpiration was not compromised by the presence of the copolymer, and the behavior in terms of mechanical properties recovery by the application of Ca(OH)2 nanoparticles remained excellent even in the presence of poly(EMA/MA).
authors.affiliation: Department of Chemistry Ugo Schiff and CSGI Consortium, University of Florence, via della Lastruccia 3, I-50019 Sesto Fiorentino (Florence), Italy.
authors.forename: Emiliano
authors.initials: E
authors.lastname: Carretti
authors.forename: David
authors.initials: D
authors.lastname: Chelazzi
authors.forename: Giulia
authors.initials: G
authors.lastname: Rocchigiani
authors.forename: Piero
authors.initials: P
authors.lastname: Baglioni
authors.forename: Giovanna
authors.initials: G
authors.lastname: Poggi
authors.forename: Luigi
authors.initials: L
authors.lastname: Dei
mesh_terms: D000179:Acrylates / Q000737:chemistry*; D002126:Calcium Hydroxide / Q000737:chemistry*; D049329:Nanostructures / Q000737:chemistry*; D010316:Particle Size; D011108:Polymers / Q000737:chemistry*; D013499:Surface Properties
chemical_list: D000179:Acrylates; D011108:Polymers; C036658:acrylic acid; D002126:Calcium Hydroxide