Hostname: page-component-78c5997874-8bhkd Total loading time: 0 Render date: 2024-11-07T20:10:50.978Z Has data issue: false hasContentIssue false
  • English
  • Français

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
Get access

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

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

1. Poli, T., Toniolo, L., Chiantore, O., “The protection of different Italian marbles with two partially fluorinated acrylic copolymers”, Appllied Physics A 79, (2004) 347–351.Google Scholar
2. Alessandrini, G., Toniolo, L., Colombo, C., “Partially fluorinated acrylic copolymers as coatings for calcareous stone materials”, Proceedings of the 18th IIC Intern. Congress, Melbourne, (2000) pp.1–6.Google Scholar
3. Alessandrini, G., Aglietto, M., Castelvetro, V., Ciardelli, F., Peruzzi, R., Toniolo, L., “Comparative evaluation of fluorinated and unfluorinated acrylic copolymers as water-repellent coating materials for stone”, Journal of Applied Polymers Science 76 (2000), 962–977.Google Scholar
4. Ciardelli, F., Aglietto, M., Castelvetro, V., Chiantore, O., Toniolo, L., “Structurally modulated fluoropolymers for conservation of monumental stones: synthesis, stability and applications”, Proceedings of the New Millennium International Forum on Conservation of Cultural Property, December 5–8th, Seoul, (2000) pp. 166–181.Google Scholar
5. Brugnara, M., Degasperi, E., Della Volpe, C., Maniglio, D., Penati, A., Siboni, S., Toniolo, L., Poli, T.., Invernizzi, S., Castelvetro, V., “The application of the contact angle in monument protection: new materials and methods”, Colloids and Surfaces A, 241 (2004) 299–312.Google Scholar
6. Poli, T., Toniolo, L., Peruzzi, R., Brugnara, M., Della Volpe, C., “Partially fluorinated acrylic copolymers as coatings for stone protection: characterization and surface properties”, Symposium II Materials Issues in Art and Archaeology VI, Symposium Proceedings Volume 712, II.3.3, (2002) 91–97.Google Scholar
7. Chiantore, O., Lazzari, M., Castelvetro, V., Aglietto, M., “Photooxidative stability of copolymers containing hexafluoroisopropyl groups” Proccedings of the Fluorine in Coatings IV, Brussels, 5–7 March 2001, Paper 15.Google Scholar
8. Chiantore, O., Lazzari, M., “Photo-oxidative stability of Paraloid acrylic protective polymers”, Polymer 42 (2001) 17–27.Google Scholar
9. Chiantore, O., Lazzari, M., Poli, T., Colombo, C., Peruzzi, R., Toniolo, L., “Stone protection and photooxidation resistance of fluorinated protectives”, Proceeding of 5th International Symposium on the Conservation of Monuments in the Mediterranean Basin 2002, Swets & Zeitlinger, Lisse, 411–416.Google Scholar
10. Poli, T., “Protective efficacy and photo-oxidative ageing stability of a new class of fluorinated acrylic polymers for the stone protection. Methodologies and problems”, PhD thesis, University of Turin, Italy (2002).Google Scholar
11. Poli, T., Toniolo, L., Chiantore, O., Lazzari, M., Castelvetro, V., Manariti, A., “Tailoring new fluorinated acrylic copolymers as protective coatings for marble”, Journal of Cultural Heritage 3 (2002) 309–316 Google Scholar
12. Chiantore, O., Colombo, C., Peruzzi, R., Poli, T., Toniolo, L. “Effect of fluorinated groups on photooxidative stability of polymeric protectives applied on marble” Annali di Chimica, 91, (2001) 741–748.Google Scholar
13. UNI10921 Protocol “Water repellents – Applications on samples and determination of their properties in laboratory” (2000).Google Scholar
14. Peruzzi, R., Poli, T., Toniolo, L. “The experimental text for the evaluation of protective treatments: a critical survey of the “Capillary Absorption Index”, Journal of Cultural Heritage 4 (2003) 251–254.Google Scholar
15. UNI10925 Protocol “Method for artificial solar light test” (2001)Google Scholar