Influence of the quality of microcrystalline cellulose on the outcome of TEMPO-mediated oxidation

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Abstract

In an attempt to prepare cellulose nanocrystals (CNCs) by TEMPO-mediated oxidation of microcrystalline cellulose (MCC), a new species of MCC called AaltoCell was placed under scrutiny. Unlike Avicel, AaltoCell is a never-dried species, still containing ca. 10% xylan in its structure. According to thermoporosimetry, the pore size distributions of AaltoCell and Avicel did not differ from each other but after TEMPO-oxidation, AaltoCell exhibited a far lower degree of porosity, hypothetically ascribed to its hemicellulose content. Surprisingly, the charge density imposed by TEMPO-oxidation did not vary between AaltoCell and Avicel despite the different microfibril widths observed, respectively. After TEMPO-oxidation and centrifugation the fine fraction share, indicating the CNC yield, was not more than 11% for AaltoCell, compared to 20% from Avicel.

Details

Original languageEnglish
Pages (from-to)5697-5704
Number of pages8
JournalCellulose
Volume24
Issue number12
Publication statusPublished - 1 Dec 2017
MoE publication typeA1 Journal article-refereed

    Research areas

  • Cellulose nanocrystals, Cellulose oxidation, Microcrystalline cellulose, Porosity, Thermoporosimetry

ID: 16235015