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Soft, Peelable Organogels From Partially Hydrolyzed Poly(vinyl Acetate) and Benzene-1,4-diboronic Acid: Applications to Clean Works of Art

Soft, Peelable Organogels From Partially Hydrolyzed Poly(vinyl Acetate) and Benzene-1,4-diboronic Acid: Applications to Clean Works of Art

Teresa T Duncan, Barbara H Berrie, Richard G Weiss

ACS Appl Mater Interfaces. 2017 Aug 23;9(33):28069-28078.

PMID: 28787129

Abstract:

We have developed soft, peelable organogels from 40% hydrolyzed poly(vinyl acetate) (40PVAc) and benzene-1,4-diboronic acid (BDBA). The organic liquids gelated include dimethyl sulfoxide, dimethylformamide, tetrahydrofuran, 2-ethoxyethanol, and methanol. The rheology of these soft materials can be tuned by altering the concentration of the polymer and/or crosslinker. Insights into the mechanisms leading to gelation were obtained from 1H NMR experiments, fluorescence measurements, and studies comparing properties of materials made from BDBA and phenylboronic acid, a molecule incapable of forming covalent crosslinks between the polymer chains. These organogels can be easily peeled off a surface, leaving no residue detectable by UV-vis spectroscopy. They are demonstrated to be effective at softening and removing deteriorated coatings from water-sensitive works of art and delicate surfaces. They have the needed characteristics to clean topographically complex surfaces: good contact with the surface, easy removal, and little to no residue after removal. A 2-ethoxyethanol organogel was used to remove oxidized varnish from a 16th century reliquary decorated with painted gold leaf, and an ethanol gel was used to remove solvent-resistant coatings from 16th and 18th century oil paintings.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP4612264	Benzene-1,4-diboronic acid		4612-26-4	Price

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