Impact of moisture adsorption on structure and physical properties of amorphous biopolymers

Karol Kulasinski*, Robert Guyer, Sinan Keten, Dominique Derome, Jan Carmeliet

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

46 Scopus citations

Abstract

The interaction of water with many biopolymers is known to rearrange their internal structure, make them moisture sensitive, and influence their physical properties. We study amorphous cellulose and hemicellulose, two hydrophilic biopolymers, using molecular dynamics simulations, and we analyze their structural and physical properties over the full range of moisture content. We find a quasi-linear dependence of volumetric strain on moisture content, and a linear scaling between volumetric strain and porosity, showing that swelling is directly related to the space created by adsorbed water molecules. The interaction of water with the polymer structure results in a weakening of the mechanical properties, leading to rubberlike behavior at high moisture content. Weakening is caused by a decrease in the number of hydrogen bonds that follow exponential scaling. Breaking of the hydrogen bonds system is found to control not only the mechanical response but also the evolution of porosity and the volumetric strain.

Original languageEnglish (US)
Pages (from-to)2793-2800
Number of pages8
JournalMacromolecules
Volume48
Issue number8
DOIs
StatePublished - Apr 28 2015

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry
  • Materials Chemistry

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