Conclusions
In the present paper a large amount of data is presented and discussed, which however is not yet sufficient to allow a clear solution to be drawn to the problem, which is:
-
i)
how do the structural parameters of a given fluorinated acrylic polymer correlate with the material properties and the protective effectiveness of the coatings made therefrom, and
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ii)
what are the key factors that need to be thoroughly understood in order to be able to adapt the macromolecular structure and/or the coating formulation, so as to achieve the effective protection of chemically diverse and morphologically complex stone surfaces of different natures, for a durable and esthetically acceptable material.
Whilst, on one side, the results obtained show clearly the promising properties of the polymers under investigation as protective materials for stoneworks, they are still far from establishing a well defined relationship that could make it possible to define the optimal structural features to fulfil all the requirements of such applications. Indeed the testing reported in this work has not allowed to clearly discriminate between materials differing in fluorine content and distribution, particularly in terms of the differences that one can expect when testing these materials on different lithotypes.
Nevertheless, the results obtained provide a great deal of information regarding the effect that the content and distribution of fluorine in the acrylic polymers exerts on such chemical and physical properties of the resulting material as its glass transition temperature and its thermal, chemical and photochemical stability.
Further studies are necessary before these materials be considered for use as new and durable coatings for the protection of stonework. In particular, it is necessary to have a better understanding of the possible role that the various structural features of these polymers have in modifying and improving the significant properties of their coatings, such as condensed water repellency, permeability to water vapour and adhesion to the substrate.
This work was partially supported by CNR-Rome Target Project for conservation of monumental buildings.
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Castelvetro, V., Aglietto, M., Montagnini di Mirabello, L. et al. Adapting the properties of new fluorinated acrylic polymers to suit the conservation of ancient monuments. Surface Coatings International 81, 551–556 (1998). https://doi.org/10.1007/BF02693082
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DOI: https://doi.org/10.1007/BF02693082