Screening of hydrogen bonds in modified cellulose acetates with alkyl chain substitutions

Nilsson, Robin, 1993 (author): Chalmers tekniska högskola,Chalmers University of Technology

Olsson, Martina, 1996 (author): Chalmers tekniska högskola,Chalmers University of Technology

Westman, Gunnar, 1964 (author): Chalmers tekniska högskola,Chalmers University of Technology

Matic, Aleksandar, 1968 (author): Chalmers tekniska högskola,Chalmers University of Technology

Larsson, Anette, 1966 (author): Chalmers tekniska högskola,Chalmers University of Technology

(creator_code:org_t)

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Abstract Subject headings

This study aimed to elucidate how the glass transition temperature and water interactions in cellulose esters are affected by the structures of their side chains. Cellulose acetate, cellulose acetate propionate and cellulose acetate butyrate with three fractions of butyrates, all having the same total degree of substitution, were selected, and hot-melt pressed. The degree of substitution, structural properties, and water interactions were determined. The Hansen solubility parameters were calculated and showed that the dispersive energy dominates the total cohesive energy, followed by hydrogen bonding and polar energy. The glass transition temperature (Tg) decreased, counter-intuitively, with an increased total cohesive energy, which can be explained by the short-range hydrogen bonds being screened by the increased length of the substituents. The solubility and penetration of water in the cellulose esters decreased with increased side chain length, although the hydrogen bonding energies for all the esters were approximately constant.

By the author/editor: Nilsson, Robin, ...; Olsson, Martina, ...; Westman, Gunnar, ...; Matic, Aleksanda ...; Larsson, Anette, ...

About the subject

NATURAL SCIENCES: NATURAL SCIENCES; and Chemical Science ...; and Inorganic Chemis ...

NATURAL SCIENCES: NATURAL SCIENCES; and Chemical Science ...; and Physical Chemist ...

NATURAL SCIENCES: NATURAL SCIENCES; and Chemical Science ...; and Theoretical Chem ...

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