On the polymorphic and morphological changes of cellulose nanocrystals (CNC-I) upon mercerization and conversion to CNC-II

Ersuo Jin, Jiaqi Guo, Fang Yang, Yangyang Zhu, Junlong Song*, Yongcan Jin, Orlando J. Rojas

*Tämän työn vastaava kirjoittaja

    Tutkimustuotos: LehtiartikkeliArticleScientificvertaisarvioitu

    66 Sitaatiot (Scopus)

    Abstrakti

    Polymorphic and morphological transformations of cellulosic materials are strongly associated to their properties and applications, especially in the case of emerging nanocelluloses. Related changes that take place upon treatment of cellulose nanocrystals (CNC) in alkaline conditions are studied here by XRD, TEM, AFM, and other techniques. The results indicate polymorphic transformation of CNC proceeds gradually in a certain range of alkali concentrations, i.e. from about 8% to 12.5% NaOH. In such transition alkali concentration, cellulose I and II allomorphs coexists. Such value and range of the transition concentration is strongly interdependent with the crystallite size of CNCs. In addition, it is distinctively lower than that for macroscopic fibers (12-15% NaOH). Transmission electron microscopy and particle sizing reveals that after mercerization CNCs tend to associate. Furthermore, TEMPO-oxidized mercerized CNC reveals the morphology of individual nanocrystal of the cellulose II type, which is composed of some interconnected granular structures. Overall, this work reveals how the polymorphism and morphology of individual CNC change in alkali conditions and sheds light onto the polymorphic transition from cellulose I to II.

    AlkuperäiskieliEnglanti
    Sivut327-335
    Sivumäärä9
    JulkaisuCarbohydrate Polymers
    Vuosikerta143
    DOI - pysyväislinkit
    TilaJulkaistu - 5 kesäkuuta 2016
    OKM-julkaisutyyppiA1 Julkaistu artikkeli, soviteltu

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