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Protection Efficacy of Fluorinated Acrylic Copolymers Applied on Historical Italian Marbles.

Published online by Cambridge University Press:  01 February 2011

Tommaso Poli  and
Lucia Toniolo
Tommaso Poli
Affiliation:
CNR-ICVBC, National Council of Researches-Institute for the Conservation and Valorisation of Cultural Heritage. P.za L. Da Vinci, 32 - 10133 Milan, Italy
Lucia Toniolo
Affiliation:
CNR-ICVBC, National Council of Researches-Institute for the Conservation and Valorisation of Cultural Heritage. P.za L. Da Vinci, 32 - 10133 Milan, Italy
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Abstract

Use of polymeric materials to protect stone started in the 1960’s but the study and knowledge of the complex and multiple interactions between stone and polymers has been carried out only recently. In a previous paper [1] the problems related to the efficacy of a stone treatment (film formation, deep penetration and coating behavior) has been addressed. In this paper performance after a thermal and a simulated solar UV ageing has been evaluated. In particular the issues related to stability and durability of two fluorinated acrylic copolymers applied on two different Italian marbles, Carrara and S. Giuliano, have been investigated. The specimens characterized and treated with two new partially fluorinated acrylic copolymers, 2, 2, 2-trifluoroethyl methacrylate / methyl acrylate (TFEMA / MA) and trifluoromethyl-2, 2, 2-trifluorethyl methacrylate / methyl acrylate (HFIMA / MA), have been artificially aged in two different ways: with a long simulated solar UV ageing of 1000h and a thermal one at the same temperature (about 50°C) usually reached in the UV chamber, in order to separate the two ageing contributions (photochemical and thermal). After the ageing most of the testing methodologies suggested by UNI-Normal Italian protocol for evaluation of stone protective coatings, including capillary water absorption, static contact angles and colour variation, have been carried out. Slightly better protective efficacy was found for the HFIMA/MA before and after the two ageing. The important contribution of the thermal component in the worsening of the shielding efficacy has been assessed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 852 , 2004 , OO6.3
Copyright
Copyright © Materials Research Society 2005

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References

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