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Improved dispersion of grafted starch granules leads to lower water resistance for starch-g-PLA/PLA composites
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Polymer Technology.
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology.ORCID iD: 0000-0002-1922-128X
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Polymer Technology.ORCID iD: 0000-0002-7790-8987
2013 (English)In: Composites Science And Technology, ISSN 0266-3538, E-ISSN 1879-1050, Vol. 86, 149-156 p.Article in journal (Refereed) Published
Abstract [en]

Polylactide (PLA) was grafted on the surface of starch (St) granules to improve the interfacial adhesion between starch granules and PLA matrix in starch/PLA blends. The grafting significantly improved strain at failure values of St-g-PLA/PLA 25:75 blends as compared to starch/PLA 25:75 blends. However, unexpectedly the water resistance of the films significantly deteriorated after the surface grafting. SEM and FTIR analysis showed that St-g-PLA was evenly distributed at the film surface and in the bulk, while unmodified starch was encapsulated inside the PLA matrix. This resulted in rapid leaching of St-g-PLA from the films during aging in water, while the unmodified starch granules were protected by PLA matrix.

Place, publisher, year, edition, pages
2013. Vol. 86, 149-156 p.
Keyword [en]
Polymer matrix composites (PMCs), Environmental degradation, Mechanical properties, Infrared (IR) spectroscopy, Scanning electron microscopy (SEM)
National Category
Composite Science and Engineering
Identifiers
URN: urn:nbn:se:kth:diva-132208DOI: 10.1016/j.compscitech.2013.07.013ISI: 000324788500020Scopus ID: 2-s2.0-84882692666OAI: oai:DiVA.org:kth-132208DiVA: diva2:659534
Note

QC 20131025

Available from: 2013-10-25 Created: 2013-10-24 Last updated: 2017-12-06Bibliographically approved

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Finne-Wistrand, AnnaHakkarainen, Minna

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