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Research article2025Peer reviewedOpen access

Towards starch-based adhesives involving carbon dots as versatile crosslinkers

Silveira, Valentin; Papadakis, Raffaello; Adamopoulos, Stergios

Abstract

In this study, biobased materials, Dialdehyde starch (DAS) and Carbon Dots (CDs) were synthesised to develop debondable adhesives via the formation of reversible imine networks between aldehyde and amine groups. Potato starch (St) was oxidised using Sodium periodate (NaIO4) and the modification was confirmed using FTIR spectroscopy, thermal analyses and Environmental scanning electron microscopy (ESEM). Two types of CDs were prepared: CD1, synthesized via a hydrothermal treatment of citric acid with formamide and aniline, and CD2, a post-functionalized version of CD1, prepared through a microwave-assisted reaction with polyethylenimine (PEI). CDs were characterized using XPS, fluorescence and absorbance spectroscopy, FTIR, TGA, DSC, as well as ESEM. DAS and CDs were reacted in DMAC to form DAS-CD conjugates through Schiff base formation. In the case of CD1, the reaction occurred through amino groups at the edges, while for CD2, the primary amino groups of PEI. The curing properties of these solutions with and without hexamethylenediamine (HMDA) as an auxiliary crosslinker were evaluated through ABES using beech veneer pressed at 160 degrees C. Finally, debondability tests on veneer samples adhered with DAS-CD1 and DAS-CD2 were tested employing the reversibility of the Schiff-base connectivity motifs. Full debondability was achieved for DAS-CD1 after 1 hour in acidic solutions.

Keywords

Carbon dots; starch; bio-based adhesives

Published in

The Journal of Adhesion
2025
Publisher: TAYLOR AND FRANCIS LTD

SLU Authors

UKÄ Subject classification

Polymer Technologies
Wood Science

Publication identifier

  • DOI: https://doi.org/10.1080/00218464.2025.2464051

Permanent link to this page (URI)

https://res.slu.se/id/publ/140862