Aqueous polyacrylate latex nanodispersions used as consolidation agents to improve mechanical properties of Prague sandstone

0573439 - ÚTAM 2024 RIV NL eng J - Článek v odborném periodiku
Ševčík, Radek - Machotová, J. - Zárybnická, Lucie - Mácová, Petra - Viani, Alberto
Aqueous polyacrylate latex nanodispersions used as consolidation agents to improve mechanical properties of Prague sandstone.
Journal of Cultural Heritage. Roč. 62, July-August (2023), s. 412-421. ISSN 1296-2074. E-ISSN 1778-3674
Grant ostatní: AV ČR(CZ) StrategieAV21/23
Program: StrategieAV
Institucionální podpora: RVO:68378297
Klíčová slova: polyacrylate latex * consolidation * Prague sandstone * mechanical properties * hydrophobicity
Obor OECD: Materials engineering
Impakt faktor: 3.1, rok: 2022
Způsob publikování: Omezený přístup
https://doi.org/10.1016/j.culher.2023.06.021

This investigation aims at assessing the potential of polyacrylate latex nanodispersions as consolida- tion agents for sandstones. Four different latex types, implementing polymer fluorination and chemical crosslinking, have been synthesized at the scope and fully characterized. The Prague sandstone employed in this study has been selected as an example of highly porous stones used as building materials for many historical monuments. Two different concentration levels of nanodispersions have been adopted. The con- solidated stone samples have been tested using a combination of physical-mechanical tests and micro- scopic observations. Compared to the non-treated samples, significant increments of mechanical proper- ties ( e.g. up to 3.3 times higher bending strength) have been detected after the consolidation treatment with concentrated products. Moreover, when 10 times diluted latex nanodispersions have been applied, the improvement of mechanical properties has still been significant, while moisture transport properties, such as water absorption, have been found to be comparable with those of the untreated sample. Fluo- rinated polymers imparted better hydrophobic properties with a contact angle above 100 °. Observations using a scanning electron microscope revealed the good filling and bridging capacity of the applied con- solidation agents. As demonstrated, by acting on the polymer structure, that is, by tuning the degree of crosslinking, polymer fluorination and gel content, the properties of these novel polyacrylate latex nan- odispersions can be tailored to the specific stone and type of decay in order to improve the effectiveness of the treatments and obtain the desired final properties. The flexibility of their chemistry offers new opportunities for preserving objects of cultural heritage that are also at risk due to the ongoing climate change.
Trvalý link: https://hdl.handle.net/11104/0343882