Divergent growth of poly(amidoamine) dendrimer-like branched polymers at the reducing end of cellulose nanocrystals
Abstract
This paper presents the growth of dendritic polymers at the reducing ends of cellulose nanocrystals by the
“grafting from” approach. We took advantage of the chemically differentiated ends of cellulose nanocrystals to
specifically synthesize dendrimers at their reducing end by the divergent approach. We used acid-amine coupling
reactions in aqueous media to synthesize the carboxylic acid- or amine-terminated poly(amidoamine) den-
drimers. The growth of dendrimer generations was monitored by UV and FTIR spectroscopies, and we suc-
cessfully introduced up to 4 generations. The dendrimer growth at reducing ends was demonstrated by the
nanocrystal adsorption driven by the peripheral amino groups onto gold surfaces. Hence, the results from quartz
crystal microbalance with dissipation (QCM-D) pointed to a rather upright orientation of the dendrimer-modified
cellulose nanocrystals. As the generation increased, the adsorbed layers appeared to be more flexible, which
demonstrated that the functionality at the reducing end can successfully tune the properties of cellulose
nanocrystals
Keywords
Tunicate cellulose nanocrystals
Reducing end functionalization
Poly(amidoamine) dendrimer
Oriented adsorption.
tunicate cellulose nanocrystals reducing end functionalization poly(amidoamine) dendrimer oriented adsorption
tunicate cellulose nanocrystals
reducing end functionalization
poly(amidoamine) dendrimer
oriented adsorption
Origin | Files produced by the author(s) |
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