Vacuum ultraviolet circular dichroism of cellulose and cellulose acetates

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

OSTI ID:6922688

Stipanovic, A J; Stevens, E S

Vacuum ultraviolet circular dichroism (VUCD) spectra were recorded for cellulose and cellulose acetates. Although glucose-containing homopolysaccharides generally display at least two VUCD bands below 180 nm, films of cellulose exhibit only a single, negative CD band of unexpectedly high molar ellipticity. This unique behavior has been attributed to the extensive three-dimensional network of hydrogen bonds characteristic of the cellulose II crystal structure. Spectra recorded for for solutions of acetylated cellulose (DS = 1, 2.5, 3) exhibited negative dichroism for the carbonyl n..--> pi../sup */ (210 nm) and ..pi --> pi../sup */ (190 nm) electronic transitions. The ellipticity of these bands was found to be a function of DS, while DS-dependent conformational transitions and/or acetate group interactions were not observed. Film samples of cellulose triacetate (CTA) gave rise to two exceptionally intense VUCD bands of opposite sign near 170 and 150 nm which disappear upon partial deacetylation. This observation raises the possibility that CTA dichroism arises from excitonic interactions which are disrupted by the removal of acetate groups. 12 references, 3 figures.

• Research Organization: State Univ. of New York, Binghamton
• OSTI ID: 6922688
• 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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