Journal
CELLULOSE
Volume 12, Issue 3, Pages 223-231Publisher
SPRINGER
DOI: 10.1007/s10570-004-3885-6
Keywords
cellulose I; crystallinity; FT Raman spectroscopy
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A Raman crystallinity index - Xc(Raman) - characterizing the degree of crystallinity of partially crystalline cellulose I samples was created, utilizing the crystallinity dependence of CH2 bending modes. For calibration, physical mixtures containing different mass fractions of crystalline cellulose I and its amorphous form were prepared. Crystallinities from 0 to 60% were generated. Relative intensity ratios of the Raman lines I-1481 (cm-1) and I-1462 (cm-1) characterizing crystalline and amorphous parts of cellulose I correlated linearly with the mass fraction of crystalline cellulose I of the mixtures. Xc(Raman) values of microcrystalline celluloses of different origins and varying degree of crystallinity correlated reasonably with results obtained from NMR spectroscopy (Xc(NMR) values).
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