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Design of Hygroscopic Bioplastic Products Stable in Varying Humidities
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2023 (English)In: Macromolecular materials and engineering, ISSN 1438-7492, E-ISSN 1439-2054, Vol. 308, no 2Article in journal (Refereed) Published
Abstract [en]

Abstract Hygroscopic biopolymers like proteins and polysaccharides suffer from humidity-dependent mechanical properties. Because humidity can vary significantly over the year, or even within a day, these polymers will not generally have stable properties during their lifetimes. On wheat gluten, a model highly hygroscopic biopolymer material, it is observed that larger/thicker samples can be significantly more mechanically stable than thinner samples. It is shown here that this is due to slow water diffusion, which, in turn, is due to the rigid polymer structure caused by the double-bond character of the peptide bond, the many bulky peptide side groups, and the hydrogen bond network. More than a year is required to reach complete moisture saturation (≈10 wt.%) in a 1 cm thick plate of glycerol-plasticized wheat gluten, whereas this process takes only one day for a 0.5 mm thick plate. The overall moisture uptake is also retarded by swelling-induced mechanical effects. Hence, hygroscopic biopolymers are better suited for larger/thicker products, where the moisture-induced changes in mechanical properties are smeared out over time, to the extent that the product remains sufficiently tough over climate changes, for example, throughout the course of a year.

Place, publisher, year, edition, pages
John Wiley & Sons, Ltd , 2023. Vol. 308, no 2
Keywords [en]
biopolymers, diffusion, moisture, relative humidity, wheat gluten
National Category
Polymer Technologies
Identifiers
URN: urn:nbn:se:miun:diva-47613OAI: oai:DiVA.org:miun-47613DiVA, id: diva2:1738007
Conference
2023/02/20
Note

https://doi.org/10.1002/mame.202200630

Available from: 2023-02-20 Created: 2023-02-20 Last updated: 2024-01-17Bibliographically approved

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http://10.1002/mame.202200630

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Nilsson, Fritjof
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