We show moisture-dependent diffusion measurements in loblolly pine cell walls by conductivity and X-ray fluorescence, and the strong correlation with the mechanical damping (tan δ) peak of hemicellulose as determined by nanoindentation-based mechanical spectroscopy. The data shows that that diffusion in wood cell walls is dependent on hemicellulose mobility and therefore highly dependent on hemicellulose glass transition. We outline the theory of diffusion around the glass transition, then discuss how molecular mobility measurements could predict performance in areas as diverse as biorefinery conversion, decay resistance, adhesive interactions and fastener corrosion.

Diffusion in wood cell walls by conductivity, x-ray fluorescence, and nanoindentation mechanical spectroscopy

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.