Influence of length and structure of aryl boronic acid crosslinkers on organogels with partially hydrolyzed poly(vinyl acetate)

Duncan, Teresa T.; Weiss, Richard G.

doi:10.1007/s00396-018-4326-7

Cited by 8 publications

(10 citation statements)

References 25 publications

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“…To address these issues, so-called 'solvent-gels' were developed as a carrier for solvents and cleaning agents as a more controllable and selective cleaning tool [6]. Since then, conservation scientists have been exploring and developing variable types of gels to meet the different cleaning requirements [7][8][9][10]. In these studies, the gels were loaded with the desired cleaning agents and successfully employed to remove variable deposits from artwork surfaces.…”

Section: Introductionmentioning

confidence: 99%

Characterization of polyvinyl alcohol-borax/agarose (PVA-B/AG) double network hydrogel utilized for the cleaning of works of art

et al. 2020

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Since cleaning of artworks may cause undesirable physicochemical alterations and is a nonreversible procedure, it is mandatory to adopt the proper cleaning procedure. Such a procedure should remove undesired materials whilst preserving the original surface. In this regard, numerous gels have been developed and exploited for the cleaning of various artwork surfaces. Lately, agarose (AG) and polyvinyl alcohol-borax (PVA-B) hydrogels have been widely employed as cleaning tools by conservators. Both hydrogels show some limitations in specific cleaning practices. In this work, we investigated the influence of including increased levels of agarose into PVA-B systems. For this reason, we performed a detailed characterization on the double network (DN) hydrogel including the chemical structure, the liquid phase retention, the rheological behavior, and the self-healing behavior of various PVA-B/AG double network hydrogels. These new hydrogels revealed better properties than PVA-B hydrogels and obviated their limitations. The inclusion of AG into PVA-B systems enhanced the liquid retention capacity, shape-stability, and mechanical strength of the blend. Furthermore, AG minimized the expelling/syneresis issue that occurs when loading PVA-B systems with low polarity solvents or chelating agents. The resultant double network hydrogel exhibits relevant self-healing properties. The PVA-B/AG double network is a new and useful cleaning tool that can be added to the conservators’ tool-kit. It is ideal for cleaning procedures dealing with porous and complex structured surfaces, vertical surfaces and for long time applications.

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Section: Introductionmentioning

confidence: 99%

Characterization of polyvinyl alcohol-borax/agarose (PVA-B/AG) double network hydrogel utilized for the cleaning of works of art

et al. 2020

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“…Molecules having more than two boronic acid groups such as DBA, benzene-1,3-diboronic acid, and biphenyl-4,4 0 -diboronic acid are known to crosslink PVA in solutions through boronate esterication to form gels with three dimensional network structures at room temperature. [33][34][35] Interestingly, the resultant gels exhibit excellent durability in aqueous solutions over a wide pH range due to the strong binding of the boronic acid groups to the 2,4-pentanediol motifs, 36 while boronic acid inherently shows reversible covalent bonding with diols based on the relatively small free energy barriers of the reverse reactions. [37][38][39][40][41] Therefore, such boronate gels have been utilized as platforms for adsorbing materials, 42,43 microcapsules, 44 and solid-based chemosensors 45 functioning in aqueous solutions even under basic conditions.…”

Section: Resultsmentioning

confidence: 99%

Boronate sol–gel method for one-step fabrication of polyvinyl alcohol hydrogel coatings by simple cast- and dip-coating techniques

et al. 2020

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The self-assembly of polyvinyl alcohol (PVA) and benzene-1,4-diboronic acid (DBA) is employed as a solgel method for one-step fabrication of hydrogel coatings with versatile functionalities. A mixture of PVA and DBA in aqueous ethanol is prepared as a coating agent. The long pot life of the mixture allows for the coating of a wide range of materials with hydrogel films by simple cast-and dip-coating techniques. The resultant films show negligible dissolution in water and the intrinsic hydrophilicity of PVA provides the films with functional properties, such as improved antifogging property and resistance to protein and cell fouling. The self-assembling process shows adaptive inclusion properties toward nanoscale materials, such as metal-organic coordination polymers and inorganic nanoparticles, affording composite films.Furthermore, the coating film exhibits a unique secondary functionalization reactivity toward boronic acid-appended fluorescent dyes, through which a variety of materials are converted into fluorescent materials.

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“…For the gel preparation, PVA was chosen as a base polymer because γ-CyD includes PVA and it can interact with PBA because the repeated hydroxyl groups comprise 1,3-diols [32][33][34][35][36][37][38]. We prepared a PBA-appended γ-CyD via a click reaction using mono-azide γ-CyD and alkyn-modified PBA (Fig.…”

Section: Pba-cyd Glcmentioning

confidence: 99%

Sugar-responsive smart materials based on phenylboronic acid and cyclodextrin

Egawa

Seki

Miki

et al. 2019

J Incl Phenom Macrocycl Chem

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This review focuses on sugar-responsive materials based on phenylboronic acid (PBA) as a sugar-sensing motif and cyclodextrins (CyDs) as a basic skeleton of smart materials. PBA modified α-CyD (PBA-α-CyD) forms a supramolecular polymer through intermolecular interactions between PBA part and CyD cavity. Similarly, PBA-β-CyD forms a head-to-head dimer. Meanwhile, combining PBA-γ-CyD and polyethylene glycol (PEG) produces a molecular necklace. Additionally, combining PBA-modified PEG and native α-CyD or γ-CyD results in another type of molecular necklace. These supramolecular structures are obtained as powders, and their solubility increases in the presence of sugar. Besides the powder type, a unique gel is formed through crosslinking polyvinyl alcohol (PVA) with PBA-triazole-γ-CyD (PBA-Tri-γ-CyD). This gel can contain model drug, and it shows sugar-responsive drug release.The sugar response of all of these smart materials can be explained by the concept of equilibrium. The smart materials are constructed with CyD-guest interactions. The CyD-guest equilibrium moves by a reaction between sugar and PBA moiety attached to the smart material. In these smart materials, sugar induces a dissociation in the CyD-guest interaction, and this dissociation results in sugar-induced disintegration of CyD-guest supramolecular structures.

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Influence of length and structure of aryl boronic acid crosslinkers on organogels with partially hydrolyzed poly(vinyl acetate)

Cited by 8 publications

References 25 publications

Characterization of polyvinyl alcohol-borax/agarose (PVA-B/AG) double network hydrogel utilized for the cleaning of works of art

Characterization of polyvinyl alcohol-borax/agarose (PVA-B/AG) double network hydrogel utilized for the cleaning of works of art

Boronate sol–gel method for one-step fabrication of polyvinyl alcohol hydrogel coatings by simple cast- and dip-coating techniques

Sugar-responsive smart materials based on phenylboronic acid and cyclodextrin

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