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  • Title: Thermally reversible nanocellulose hydrogels synthesized via the furan/maleimide Diels-Alder click reaction in water.
    Author: Kramer RK, Belgacem MN, Carvalho AJF, Gandini A.
    Journal: Int J Biol Macromol; 2019 Dec 01; 141():493-498. PubMed ID: 31494162.
    Abstract:
    The study deals with the synthesis of thermally reversible hydrogels from modified cellulose nanofibers via the Diels-Alder "click" reaction in an aqueous medium. "Never-dried" cellulose fibres derived from hardwood were submitted to shearing and surface TEMPO-oxidation before being modified with furfurylamine. The ensuing pendant furan moieties were reacted with a water-soluble bismaleimide via Diels-Alder coupling at 65 °C to produce a hydrogel, whose deconstruction was induced by the corresponding retro-Diels-Alder reaction carried out at 95 °C. Differential scanning calorimetry and rheological measurement were used to characterize the hydrogels. These aqueous cellulosic materials should provide original applications in such areas as strong paper-based artefacts and biocompatible gels.
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