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Grafting polyethylene glycol on nanocellulose toward biodegradable polymer nanocomposites
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.ORCID iD: 0000-0003-1776-2725
Royal Institute of Technology, School of Biotechnology, Stockholm.
Luleå University of Technology.
Royal Institute of Technology, School of Biotechnology, Stockholm.
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2017 (English)In: ICCM21 Proceedings, ICCM, International Committee on Composite Materials , 2017Conference paper, Published paper (Refereed)
Abstract [en]

The reinforcing effect of a small amount of nanocellulose materials on biodegradable and polymer-based nanocomposites remains challenging because of the poor dispersion of the nanomaterials and inefficient interaction between the nanocellulose and the polymer matrix. To improve this, we grafted polyethylene glycol (PEG) on nanocellulose and produced composites of 0.1 wt% nanocellulose materials and polylactic acid (PLA) matrix. Here, two types of PEG grafted nanocellulose including TEMPO-oxidized cellulose nanocrystals (TOCNCs) and cellulose nanofibers (TOCNFs), with different lengths and diameters were used as reinforcements, respectively. We investigated the effects of grafting PEG on microstructure, mechanical properties and thermal behaviors of the PLA/nanocellulose composites. It is found that the PEG grafted nanocellulose dispersed better compared to the unmodified nanocellulose in the PLA matrix, and provides higher reinforcing effect that improves the elastic modulus of the nanocomposites compared to the composites with unmodified nanocellulose and ungrafted PEG. However, the glass transition temperature of the nanocomposites was not improved by grafting PEG significantly. We also found that the nanocomposites reinforced by TOCNF exhibited enhanced mechanical and thermal properties compared to those with TOCNCs, which is caused by the higher aspect ratio of the TOCNFs.

Place, publisher, year, edition, pages
ICCM, International Committee on Composite Materials , 2017.
Keywords [en]
Nanocellulose, Grafting, Dispersion, Mechanical property, Thermal property
National Category
Composite Science and Engineering Bio Materials
Research subject
Wood and Bionanocomposites
Identifiers
URN: urn:nbn:se:ltu:diva-72436Scopus ID: 2-s2.0-85053118470OAI: oai:DiVA.org:ltu-72436DiVA, id: diva2:1275017
Conference
21st International Conference on Composites Materials, August 20-24, 2017, Xi’an, China
Available from: 2019-01-04 Created: 2019-01-04 Last updated: 2019-01-04Bibliographically approved

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Scopushttp://www.iccm-central.org/Proceedings/ICCM21proceedings/ICCM21Proceedings.htmFulltext

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Geng, ShiyuOksman, Kristiina

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Geng, ShiyuHarila, MariaOksman, Kristiina
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