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Issue 25, 2014
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Physicochemical characterization of partially hydrolyzed poly(vinyl acetate)–borate aqueous dispersions

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Abstract

The dynamic and structural properties of Highly Viscous Polymeric Dispersions (HVPDs), constituted of polyvinyl alcohol obtained from the 75% hydrolysis (75PVA) of polyvinlyl acetate (PVAc) cross-linked with borate ions, were studied as a function of the 75PVA concentration at a constant ratio between the OH groups and the borate ions (OH/B(OH)4). The threshold 75PVA concentration C* necessary for the formation of the three-dimensional network was determined by flow rheology. The oscillating rheology measurements were performed in the linear viscoelastic region; the relaxation spectra calculated from the frequency sweep curves showed only one peak whose width increased upon increasing the 75PVA concentration due to the broadening of the relaxation modes. The dependence of the mean relaxation time τH upon the concentration of 75PVA followed a power law expression (τHCx with x = 1.9) indicating that τH referred to a sticky reptation mechanism and that water was a good solvent for 75PVA as confirmed also by small angle X-rays scattering (SAXS) investigation. The HVPDs were used for the removal of grime layers from the surface of Carlo Carrà (1881–1966) paints decorating the walls of the Palazzo di Giustizia in Milan, Italy.

Graphical abstract: Physicochemical characterization of partially hydrolyzed poly(vinyl acetate)–borate aqueous dispersions

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Publication details

The article was received on 14 Feb 2014, accepted on 31 Mar 2014 and first published on 12 May 2014


Article type: Paper
DOI: 10.1039/C4SM00355A
Citation: Soft Matter, 2014,10, 4443-4450
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    Physicochemical characterization of partially hydrolyzed poly(vinyl acetate)–borate aqueous dispersions

    E. Carretti, C. Matarrese, E. Fratini, P. Baglioni and L. Dei, Soft Matter, 2014, 10, 4443
    DOI: 10.1039/C4SM00355A

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