Screening of hydrogen bonds in modified cellulose acetates with alkyl chain substitutions
Journal article, 2022

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.

Hydrogen bonding

Hansen solubility parameters

Water interactions

Cellulose acetate

Glass transition temperature

Screening

Author

Robin Nilsson

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry

Martina Olsson

Chalmers, Physics, Materials Physics

Gunnar Westman

Chalmers, Chemistry and Chemical Engineering, Chemistry and Biochemistry

Aleksandar Matic

Chalmers, Physics, Materials Physics

Anette Larsson

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry

Carbohydrate Polymers

0144-8617 (ISSN)

Vol. 285 119188

Design of moisture resistant oxygen bio-barriers through systematic multivariable structure-property predictions

Formas (2017-00648), 2018-01-01 -- 2020-12-31.

Subject Categories

Inorganic Chemistry

Physical Chemistry

Theoretical Chemistry

DOI

10.1016/j.carbpol.2022.119188

PubMed

35287840

More information

Latest update

3/8/2022 2