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  Cellulose lattice strains and stress transfer in native and delignified wood

Spies, P.-A., Keplinger, T., Horbelt, N., Reppe, F., Scoppola, E., Eder, M., et al. (2022). Cellulose lattice strains and stress transfer in native and delignified wood. Carbohydrate Polymers, 296: 119922. doi:10.1016/j.carbpol.2022.119922.

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 Creators:
Spies, Paul-Antoine, Author
Keplinger, Tobias, Author
Horbelt, Nils1, Author           
Reppe, Friedrich1, Author           
Scoppola, Ernesto2, Author           
Eder, Michaela1, Author           
Fratzl, Peter, Author
Burgert, Ingo, Author
Rüggeberg, Markus, Author
Affiliations:
1Michaela Eder, Biomaterialien, Max Planck Institute of Colloids and Interfaces, Max Planck Society, ou_1863293              
2Wolfgang Wagermaier, Biomaterialien, Max Planck Institute of Colloids and Interfaces, Max Planck Society, ou_1863296              

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Free keywords: Delignified wood; In-situ tensile tests; Stress-transfer; Stress-strain behavior; Cellulose lattice strain
 Abstract: Small specimens of spruce wood with different degrees of delignification were studied using in-situ tensile tests and simultaneous synchrotron X-ray diffraction to reveal the effect of delignification and densification on their tensile properties at relative humidity of 70–80 %. In addition to mechanical properties, these analyses yield the ratio of strains in the cellulose crystals and in the bulk, which reflects the stress-transfer to crystalline cellulose. While the specific modulus of elasticity slightly increases from native wood by partial or complete delignification, the lattice strain ratio does not show a significant change. This could indicate a compensatory effect from the decomposition of the amorphous matrix by delignification and from a tighter packing of cellulose crystals that would increase the stress transfer. The reduced strain to failure and maximum lattice strain of delignified specimens suggests that the removal of lignin affects the stress-strain behavior with fracture at lower strain levels.

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Language(s): eng - English
 Dates: 2022-07-282022
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1016/j.carbpol.2022.119922
PMID: 0631
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Title: Carbohydrate Polymers
Source Genre: Journal
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Publ. Info: London [Eng.] : Elsevier
Pages: - Volume / Issue: 296 Sequence Number: 119922 Start / End Page: - Identifier: ISSN: 0144-8617