The use of cyclododecane as an insulating layer in the moulding process of porous stone

Autores UPV
Año
CONGRESO The use of cyclododecane as an insulating layer in the moulding process of porous stone

Abstract

The physicochemical properties of artworks of the Historic-Artistic and Cultural Heritage are modified by degradative environmental agents and biodeterioration. In many cases, the most effective action/ intervention is the replacement of the work of art by a copy, moving the original into a museum or another more protected place. In general, the preventive conservation solution considers, among other practices, the moulding of the original and its reproduction by restoration mortars. This study evaluates the possibility to use the cyclododecane as a temporary barrier film during the moulding of extreme porous stone sculptures and ornaments. For this, samples of a travertine (calcium carbonate rock) Tosca de Rocafort (TR) have been prepared. The travertines, exceptionally porous with numerous cavities, are percolated in an irreversible way by the molding substance, representing the main problem of these rocks. With the cyclododecane the pores are sealed without losing the texture of stone substratum and at the same time it prevents the silicone to penetrate inside. To solve the affinity between the cyclododecane and the silicone, several polar substances (funori, agar-agar and latex) were applied as insulation layer. The stone samples prepared with the cyclododecane were tested by irradiation with ultraviolet light (photoageing). The results have been obtained through spectrophotometry, optical microscopy (OM) and Fourier transform infrared spectroscopy (FTIR). At the same time, it was possible to characterise the resulting cyclododecane films through the cryogenic scanning electron microscopy (cryo-SEM). The cyclododecane applied as temporary fixative material in stony materials with extreme porous has turned out to be suitable, creating a homogeneous, impervious and inert film.