Structure of cellulose: quantitative analysis by Raman spectroscopy

Conference · Sat Jan 01 04:00:00 EST 1983 · J. Appl. Polym. Sci.: Appl. Polym. Symp.; (United States)

OSTI ID:6922669

Atalla, R H

Raman and /sup 13/C NMR spectra of cellulose indicate that the two primary polymorphs (I and II) possess different conformations of the basic anhydrocellobiose repeat units in the molecular chains. This interpretation is consistent with infrared and X-ray data. The two stable conformations have been identified as k/sub I/ and k/sub II/, corresponding to their dominance in celluloses I and II, respectively. The linearly disordered state of the chains is identifed as k/sub 0/. A model of polymorphy based on coexistence of different combinations of k/sub I/, k/sub II/ and k/sub 0/ in different celluloses has been developed. The model provides a basis for quantitative resolution of the Raman spectra of celluloses to establish the distributions of conformational states in particular samples. This procedure permits quantitative characterization of the structures of native and processed celluloses that are not pure polymorphic forms. The procedure for quantitative analysis is illustrated by application to two systems. In the first, mechanical action is shown to convert cellulose from k/sub I/ to k/sub II/ and k/sub 0/. In the second example, the effects of treatment of a wood pulp with NaOH solutions of different strength are measured. 9 references, 3 figures.

• Research Organization: Inst. of Paper Chemistry, Appleton, WI
• OSTI ID: 6922669
• Report Number(s): CONF-8205234-Vol.1
• Conference Information: Journal Name: J. Appl. Polym. Sci.: Appl. Polym. Symp.; (United States)
• Country of Publication: United States
• Language: English

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ALKALINE HYDROLYSIS
CARBOHYDRATES
CELLULOSE
CHEMICAL ANALYSIS
CHEMICAL REACTIONS
COMMINUTION
CRYSTAL LATTICES
CRYSTAL STRUCTURE
DECOMPOSITION
HYDROLYSIS
LASER SPECTROSCOPY
LYSIS
MATHEMATICAL MODELS
MOLECULAR MODELS
MOLECULAR STRUCTURE
ORGANIC COMPOUNDS
POLYSACCHARIDES
QUANTITATIVE CHEMICAL ANALYSIS
RAMAN SPECTRA
RAMAN SPECTROSCOPY
SACCHARIDES
SOLVOLYSIS
SPECTRA
SPECTROSCOPY
STRUCTURAL CHEMICAL ANALYSIS