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Mechanical properties of biodegradable composites from poly lactic acid (PLA) and microcrystalline cellulose (MCC)
Norwegian University of Science and Technology (NTNU), Trondheim.ORCID iD: 0000-0003-4762-2854
University of Toronto.
2005 (English)In: Journal of Applied Polymer Science, ISSN 0021-8995, E-ISSN 1097-4628, Vol. 97, no 5, p. 2014-2025Article in journal (Refereed) Published
Abstract [en]

Biodegradable composites were prepared using microcrystalline cellulose (MCC) as the reinforcement and polylactic acid (PLA) as a matrix. PLA is polyester of lactic acid and MCC is cellulose derived from high quality wood pulp by acid hydrolysis to remove the amorphous regions. The composites were prepared with different MCC contents, up to 25 wt %, and wood flour (WF) and wood pulp (WP) were used as reference materials. Generally, the MCC/PLA composites showed lower mechanical properties compared to the reference materials. The dynamic mechanical thermal analysis (DMTA) showed that the storage modulus was increased with the addition of MCC. The X-ray diffraction (XRD) studies on the materials showed that the composites were less crystalline than the pure components. However, the scanning electron microscopy (SEM) study of materials showed that the MCC was remaining as aggregates of crystalline cellulose fibrils, which explains the poor mechanical properties. Furthermore, the fracture surfaces of MCC composites were indicative of poor adhesion between MCC and the PLA matrix. Biodegradation studies in compost soil at 58°C showed that WF composites have better biodegradability compared to WP and MCC composites. The composite performances are expected to improve by separation of the cellulose aggregates to microfibrils and with improved adhesion

Place, publisher, year, edition, pages
2005. Vol. 97, no 5, p. 2014-2025
National Category
Bio Materials
Research subject
Wood and Bionanocomposites
Identifiers
URN: urn:nbn:se:ltu:diva-8615DOI: 10.1002/app.21779Local ID: 72206630-a4a4-11dc-8fee-000ea68e967bOAI: oai:DiVA.org:ltu-8615DiVA, id: diva2:981553
Note

Upprättat; 2005; 20071207 (cira)

Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2017-11-24Bibliographically approved

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Mathew, Aji P.Oksman, Kristiina

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