Preprint Article Version 1 This version is not peer-reviewed

Performance of Clay, SiO2, Ca(OH)2 and CaCO3 - Polymeric Nanocomposites for Conservation and Preservation of Limestone Artworks

Version 1 : Received: 7 March 2018 / Approved: 7 March 2018 / Online: 7 March 2018 (13:50:06 CET)

How to cite: Aldoasri, M.A.; Darwish, S.; Adam, M.; Elmarzugi, N.; Ahmed, S. Performance of Clay, SiO2, Ca(OH)2 and CaCO3 - Polymeric Nanocomposites for Conservation and Preservation of Limestone Artworks. Preprints 2018, 2018030055 (doi: 10.20944/preprints201803.0055.v1). Aldoasri, M.A.; Darwish, S.; Adam, M.; Elmarzugi, N.; Ahmed, S. Performance of Clay, SiO2, Ca(OH)2 and CaCO3 - Polymeric Nanocomposites for Conservation and Preservation of Limestone Artworks. Preprints 2018, 2018030055 (doi: 10.20944/preprints201803.0055.v1).

Abstract

Environmental deterioration factors are constantly increasing, causing unwanted aesthetic changes to stone artworks due to exposure to various physical and chemical deterioration factors. Inorganic nanoparticle-filled polymer composites have extended their multiple functionalities to various applications, including cultural heritage conservation. Therefore, this study has examined the effects of clay, SiO2, Ca(OH)2 and CaCO3 nanomaterials in the enhancement of the physicomechanical properties of limestone monuments, the aim of the present work being to evaluate comparatively the effectiveness of nanoparticles as consolidation and protection material for limestone artworks. The nanoparticles were added to an acrylic-based copolymer (polyethylmethacrylate (EMA)/methylacrylate (MA) (70/30), in order to improve its physiochemical and mechanical properties, and produced a significant improvement in the ability of the polymers to consolidate and protect the stone. The synthesis process of nanoparticles/polymer nanocomposite has been prepared by an in situ emulsion polymerization system. The nanocomposites contained poly (EMA/MA) with a solid content of 3% [poly (EMA/MA)] in the absence and presence of 5% nanoparticles (0.15 g nanoparticles). Samples were subjected to artificial aging by relative humidity/temperature and acid/salt crystallization weathering to show the optimum conditions of durability and the effectiveness of the nano-mixture in improving the physical and mechanical properties of the stone material. To ensure that the treatment had no negative effects on the physical characteristics of the limestone, the properties of the treated limestone samples were evaluated comparatively before and after artificial aging by the conduct of microstructural (phase morphology studied by means of scanning electron microscopy) and aesthetic (colour and lightness measured by spectrophotometry) analyses. Also used were measurement of static contact angle of water droplets on the surface of the samples, total immersion water absorption, compressive strength, and abrasion resistance test. Results demonstrated that the addition of nanoparticles to an acrylic-based polymer enhanced its capability to consolidate and protect the limestone samples.

Subject Areas

Polymeric nanocomposites; limestone artworks; cultural heritage conservation; consolidation; colorimetric measurements.

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