High Efficiency Fluorinated Oligo(ethylenesuccinamide) Coating for Stone

Coatings

Yijian Cao¹  Mara Camaiti¹  Villiam Bortolotti²  Alessandra Papacchini³  Antonella Salvini³  Leonardo Brizi⁴ 

[1] CNR-Institute of Geosciences and Earth Resources, 50121 Florence, Italy;Department DICAM, University of Bologna, 40131 Bologna, Italy;Department of Chemistry, University of Florence, 50019 Sesto Fiorentina, Italy;Department of Physics and Astronomy, University of Bologna, 40127 Bologna, Italy;

关键词: perfluoropolyethers;    cultural heritage;    stone protection;    oligo(ethylensuccinamide);    magnetic resonance imaging;    magnetic resonance relaxometry;   

DOI  :  10.3390/coatings11040452

来源: DOAJ

【 摘 要 】

The protection of stone cultural assets is related to the transformation of the surface characteristic from hydrophilic to hydrophobic/superhydrophobic through the application of a coating. The suitability of a coating depends not only on its capability to dramatically change the surface wettability, but also on other parameters such as the modification of kinetics of water absorption, the permanence of vapor diffusivity, the resistance of the coating to aging and the low volatile organic compound emissions during its application. In this work, an oligo(ethylensuccinamide) containing low molecular pendant perfluoropolyether segments (SC2-PFPE) and soluble in environmentally friendly solvents was tested as a protective agent for historic stone artifacts. Magnetic resonance imaging and relaxometry were employed to evaluate the effects of the surface wettability change, to follow the water diffusion inside the rock and to study the porous structure evolution after the application of SC2-PFPE. A sun-like irradiation test was used to investigate the photo-stability of the product. The results demonstrate that the highly photo-stable SC2-PFPE minimizes the surface wettability of the stone by modifying the water sorptivity without significantly affecting its porous structure and vapor diffusivity. The improved performance of SC2-PFPE in comparison to other traditional coatings makes it a potential candidate as an advanced coating for stone cultural heritage protection.

【 授权许可】

Unknown