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Cellulose

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24.03.2017 | Original Paper

Cellulose nanocrystals prepared in H₃PW₁₂O₄₀-acetic acid system

verfasst von: Mikhail A. Torlopov, Elena V. Udoratina, Ilia S. Martakov, Petr A. Sitnikov

Erschienen in: Cellulose | Ausgabe 5/2017

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Abstract

Cellulose nanocrystals (CNC) were prepared by destruction of cotton cellulose using phosphotungstic acid in acetic acid medium. The study shows the influence of the heteropolyacid concentration, pre-activation, and hydrogen peroxide addition on the size of CNC particles. CNC were characterized using the methods of dynamic light scattering, FTIR-spectroscopy, thermogravimetric analysis, differential scanning calorimetry, X-ray diffraction, scanning and transmission electron microscopy, and potentiometric titration. CNC particles have highly-crystalline structure and rod-like morphology. Freeze-dried CNC hydrosols form lamellar or fibrous agglomerates, depending on the initial concentration of the CNC sol. Potentiometric titration results show increase in surface activity index and offset of pK_a values for CNC active centers in comparison to initial cellulose material.

Vorheriger Artikel Topochemistry of cellulose nanofibers resulting from molecular and polymer grafting

Nächster Artikel Polylactide/cellulose nanocrystal composites: a comparative study on cold and melt crystallization

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Titel: Cellulose nanocrystals prepared in H3PW12O40-acetic acid system
verfasst von: Mikhail A. Torlopov
Elena V. Udoratina
Ilia S. Martakov
Petr A. Sitnikov
Publikationsdatum: 24.03.2017
Verlag: Springer Netherlands
Erschienen in: Cellulose / Ausgabe 5/2017
Print ISSN: 0969-0239
Elektronische ISSN: 1572-882X
DOI: https://doi.org/10.1007/s10570-017-1256-3

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