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Pure and Applied Chemistry

The Scientific Journal of IUPAC

Ed. by Burrows, Hugh / Stohner, Jürgen

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Volume 89, Issue 1

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Chelators confined into 80pvac-borax highly viscous dispersions for the removal of gypsum degradation layers

Chiara Berlangieri
  • Department of Chemistry “Ugo Schiff” and CSGI Consortium, University of Florence, via della Lastruccia, 3 – 50019 Sesto Fiorentino (Florence), Italy
  • Other articles by this author:
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/ Elisabetta Andrina
  • Department of Chemistry “Ugo Schiff” and CSGI Consortium, University of Florence, via della Lastruccia, 3 – 50019 Sesto Fiorentino (Florence), Italy
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/ Caterina Matarrese
  • Department of Chemistry “Ugo Schiff” and CSGI Consortium, University of Florence, via della Lastruccia, 3 – 50019 Sesto Fiorentino (Florence), Italy
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/ Emiliano Carretti
  • Department of Chemistry “Ugo Schiff” and CSGI Consortium, University of Florence, via della Lastruccia, 3 – 50019 Sesto Fiorentino (Florence), Italy
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/ Rita Traversi
  • Department of Chemistry “Ugo Schiff”, University of Florence, via della Lastruccia, 3 – 50019 Sesto Fiorentino (Florence), Italy
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/ Mirko Severi
  • Department of Chemistry “Ugo Schiff”, University of Florence, via della Lastruccia, 3 – 50019 Sesto Fiorentino (Florence), Italy
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/ David Chelazzi
  • Department of Chemistry “Ugo Schiff” and CSGI Consortium, University of Florence, via della Lastruccia, 3 – 50019 Sesto Fiorentino (Florence), Italy
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/ Luigi Dei
  • Corresponding author
  • Department of Chemistry “Ugo Schiff” and CSGI Consortium, University of Florence, via della Lastruccia, 3 – 50019 Sesto Fiorentino (Florence), Italy, Tel.: +39 055 4573045, Fax: +39 055 4574913
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/ Piero Baglioni
  • Department of Chemistry “Ugo Schiff” and CSGI Consortium, University of Florence, via della Lastruccia, 3 – 50019 Sesto Fiorentino (Florence), Italy
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Published Online: 2017-01-26 | DOI: https://doi.org/10.1515/pac-2016-0815

Abstract

In this paper a new method for the removal of gypsum degradation layers from carbonatic matrices in cultural heritage conservation, using aqueous Highly Viscous Polymeric Dispersions (HVPDs) based on partially hydrolyzed poly(vinyl acetate) and borax, embedded with chelators, is presented. Due to their interesting viscoelasticity, these systems guarantee a good adhesion to the treated surface and easiness of removal in one step, minimizing the residues. Thus, they can potentially overcome the “residue question” limit associated to traditional methodologies that use thickened solutions of chelators. Here the rheological properties of HVPDs containing different amounts of selected chelating agents are explored and their efficacy in the extraction of gypsum is verified through cleaning tests onto artificially sulfated travertine tiles. The homogeneous removal of gypsum across the surface was checked non-invasively via Fourier Transform Infrared Spectroscopy (FTIR) 2D Imaging. An analytical protocol for the pre-treatment and the analysis of HVPD samples by means of Ion Cromatography (IC) and Inductively Coupled Plasma Atomic Emission Spectroscopy (ICP-AES) was set up and the approximate amount of calcium sulfate removed was determined.

Keywords: chelates; desulphatisation; gypsum layers; POC-16; poly vinyl alcohol-borax; viscoelasticity

Article note:

A collection of invited papers based on presentations at the 16th International Conference on Polymers and Organic Chemistry (POC-16), Hersonissos (near Heraklion), Crete, Greece, 13–16 June 2016.

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About the article

Published Online: 2017-01-26

Published in Print: 2017-01-01


Citation Information: Pure and Applied Chemistry, Volume 89, Issue 1, Pages 97–109, ISSN (Online) 1365-3075, ISSN (Print) 0033-4545, DOI: https://doi.org/10.1515/pac-2016-0815.

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