Time-resolved X-ray diffraction microprobe studies of the conversion of cellulose I to ethylenediamine-cellulose I

Journal Article · Tue Aug 03 04:00:00 EDT 2010 · Cellulose

DOI:https://doi.org/10.1007/s10570-010-9415-9· OSTI ID:1002554

Nishiyama, Yoshiharu; Wada, Masahisa; Hanson, B Leif; Langan, Paul ^[1]

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1. Toledo

Structural changes during the treatment of films of highly crystalline microfibers of Cladophora cellulose with ethylenediamine (EDA) have been studied by time-resolved X-ray microprobe diffraction methods. As EDA penetrates the sample and converts cellulose I to EDA-cellulose I, the measured profile widths of reflections reveal changes in the shapes and average dimensions of cellulose I and EDA-cellulose I crystals. The (200) direction of cellulose I is most resistant to EDA penetration, with EDA penetrating most effectively at the hydrophilic edges of the hydrogen bonded sheets of cellulose chains. Most of the cellulose chains in the initial crystals of cellulose I are incorporated into crystals of EDA-cellulose I. The size of the emerging EDA-cellulose I crystals is limited to about half of their size in cellulose I, most likely due to strains introduced by the penetration of EDA molecules. There is no evidence of any gradual structural transition from cellulose I to EDA-cellulose I involving a continuously changing intermediate phase. Rather, the results point to a rapid transition to EDA-cellulose I in regions of the microfibrils that have been penetrated by EDA.

• Research Organization: Advanced Photon Source (APS), Argonne National Laboratory (ANL), Argonne, IL (US)
• Sponsoring Organization: USDOE
• OSTI ID: 1002554
• Journal Information: Cellulose, Journal Name: Cellulose Journal Issue: (4) ; 08, 2010 Vol. 17
• Country of Publication: United States
• Language: ENGLISH

Related Subjects

08 HYDROGEN
CELLULOSE
CHAINS
DIFFRACTION METHODS
DIMENSIONS
HYDROGEN
STRAINS
X-RAY DIFFRACTION