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    One-pot preparation of bi-functional cellulose nanofibrils

    Year: 2018

    Journal: Cellulose, Volume 25, DEC, page 7031–7042

    Authors: Kaldeus, Tahani; Larsson, Per Tomas; Boujemaoui, Assya; Malmstrom, Eva

    Organizations: Wallenberg Wood Science Center (WWSC)

    Keywords: Carboxymethylation; Functionalised cellulose nanofibrils; Allylation; Alkynation

    Herein, we present a route to obtain bi-functional cellulose nanofibrils (CNF) by a one-pot approach using an already established functionalisation route, carboxymethylation, to which a subsequent functionalisation step, allylation or alkynation, has been added in the same reaction pot, eliminating the need of solvent exchange procedures. The total charge of the fibres and the total surface charge of the nanofibrils were determined by conductometric and polyelectrolyte titration, respectively. Furthermore, the allyl and alkyne functionalised cellulose were reacted with methyl 3-mercaptopropionate and azide-functionalised disperse red, respectively, to estimate the degree of functionalisation. The samples were further assessed by XPS and FT-IR. Physical characteristics were evaluated by CP/MAS C-13-NMR, XRD, AFM and DLS. This new approach of obtaining bi-functionalised CNF allows for a facile and rapid functionalisation of CNF where chemical handles can easily be attached and used for further modification of the fibrils. [GRAPHICS]
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