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Cellulose Nanocomposite Biopolymer Foam-Hierarchical Structure Effects on Energy Absorption
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology. KTH, School of Chemical Science and Engineering (CHE), Centres, Wallenberg Wood Science Center.ORCID iD: 0000-0002-4583-723X
KTH, School of Chemical Science and Engineering (CHE), Centres, Wallenberg Wood Science Center. KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology.ORCID iD: 0000-0001-5818-2378
2011 (English)In: ACS APPLIED MATERIALS & INTERFACES, ISSN 1944-8244, Vol. 3, no 5, 1411-1417 p.Article in journal (Refereed) Published
Abstract [en]

Starch is an attractive biofoam candidate as replacement of expanded polystyrene (EPS) in packaging materials. The main technical problems with starch foam include its hygroscopic nature, sensitivity of its mechanical properties to moisture content, and much lower energy absorption than EPS. In the present study, a starch-based biofoam is for the first time able to reach comparable mechanical properties (E = 32 MPa, compressive yield strength, 630 kPa) to EPS at 50% relative humidity and similar relative density. The reason is the nanocomposite concept concept in the form of a cellulose nanofiber network reinforcing the hygroscopic amylopectin starch matrix in the cell wall. The biofoams are prepared by the freezing/freeze-drying technique and subjected to compressive loading. Cell structure is characterized by FE-SEM of cross sections. Mechanical properties are related to cell structure and cell wall nanocomposite composition. Hierarchically structured biofoams are demonstrated to be interesting materials with potential for strongly improved mechanical properties.

Place, publisher, year, edition, pages
2011. Vol. 3, no 5, 1411-1417 p.
Keyword [en]
starch, cellulose nanofibers, biofoam, mechanical properties, packaging applications
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:kth:diva-34402DOI: 10.1021/am200183uISI: 000290843800008Scopus ID: 2-s2.0-84857705325OAI: oai:DiVA.org:kth-34402DiVA: diva2:420908
Note
QC 20110607Available from: 2011-06-07 Created: 2011-06-07 Last updated: 2011-06-07Bibliographically approved

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Berglund, Lars A.

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