A convenient method for formation of 2,3-dialdehyde cellulose (DAC) beads via periodate oxidation of highly crystalline nanocellulose from the Cladophora algae in water has been developed. The periodate oxidation of highly crystalline nanocellulose to provide DAC has previously been reported to give moderately oxidized cellulose. With our method degrees of oxidation up to 100% (∼12 mmol) has been achieved using nanocellulose from Cladophora algae. At high degrees of oxidation (&gt;80%) the morphology of the nanocellulose changed dramatically and spherical beads, which ranged in size from 2-20 μm, were formed. This method provides DAC beads with an aldehyde content of up to 12 mmol in a simple one-pot reaction using water as reaction medium. Further, a route based on cross-linking with diamines via reductive amination to provide DAC beads with increased specific surface area (SSA) and porosity in the mesoporous range has been developed. The introduction of diamines provide beads with a porous texture and a SSA increasing from &lt;1 m2/g to &gt;30 m2/g. Both aliphatic and aromatic diamines were found useful for producing porous beads having a pore size distribution range between 10 and 100 nm. The total porosity of the beads was, according to mercury porosimetry, in the range of 54-64%. It was concluded that introduction of tethered diamines to DAC beads is a simple and effective method to produce mesoporous beads.

One-pot formation of 2,3-dialdehyde cellulose (DAC) beads

249th National Meeting (2015)

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