首页|"Green" biocomposite Poly (vinyl alcohol)/starch cryogels as new advanced tools for the cleaning of artifacts

"Green" biocomposite Poly (vinyl alcohol)/starch cryogels as new advanced tools for the cleaning of artifacts

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  • NSTL
  • Elsevier
Hypothesis: Gels made from synthetic polymers have improved the cleaning of artifacts, but there is the strong need to elaborate new systems through an all-green approach, developing materials with higher eco-compatibility while retaining optimal efficacy. Rice starch (RS) is a renewable biopolymer with high potential for formulating sustainable gels from composites with synthetic polymers, but its interaction with the latter in composite structures is poorly understood. Experiments: Poly (vinyl alcohol) (PVA) and RS were used to obtain biocomposite hydrogels through a robust and "green" freeze-thawing route. For the first time, extensive understanding of these composites was tackled by investigating their gel structure and rheological behavior. The cleaning effectiveness of the PVA/RS gels was assessed on soiled modern painting mock-ups, whose water-sensitiveness makes their cleaning too risky using traditional tools. Findings: The composites behave as strong gels whose structure and viscoelastic response are controlled tuning the PVA/RS ratio. X-ray scattering and thermal analysis suggested the formation of hybrid PVA-RS links. Starch amylopectin likely acts as a porogen, while amylose forms hydrogen bonds with PVA. The gels adhere to rough paint layers and remove soil effectively without detectable residues. Overall, the PVA/RS composites are highly effective and provide a significant step forward in the formulation of eco-sustainable cleaning formulations. (c) 2022 Elsevier Inc. All rights reserved.

HydrogelsPVAStarchFreeze-thawGreen chemistryCleaning artSmall Angle X-Ray ScatteringConfocal MicroscopyChord analysisRheological propertiesFINE-STRUCTURESTARCHHYDROGELSAMYLOSECONSERVATIONAMYLOPECTINMORPHOLOGYRETROGRADATIONGELATINIZATIONTEMPERATURE

Rosciardi, Vanessa、Chelazzi, David、Baglioni, Piero

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Univ Florence

2022

10.1016/j.jcis.2021.12.145

Journal of Colloid and Interface Science

Journal of Colloid and Interface Science

EISCI
ISSN：0021-9797
年,卷(期)：2022.613
  • 11
  • 66