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Dynamic Nanocellulose Networks for Thermoset-like yet Recyclable Plastics with a High Melt Stiffness and Creep Resistance
Chalmers Univ Technol, Dept Chem & Chem Engn, S-41296 Gothenburg, Sweden..
Chalmers Univ Technol, Dept Chem & Chem Engn, S-41296 Gothenburg, Sweden..
Chalmers Univ Technol, Dept Chem & Chem Engn, S-41296 Gothenburg, Sweden..ORCID iD: 0000-0003-1970-8327
Chalmers Univ Technol, Dept Ind & Mat Sci, S-41296 Gothenburg, Sweden..
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2019 (English)In: Biomacromolecules, ISSN 1525-7797, E-ISSN 1526-4602, Vol. 20, no 10, p. 3924-3932Article in journal (Refereed) Published
Abstract [en]

Many polymers, including polyethylene, feature a relatively low melting point and hence must be cross-linked to make them viable for applications that demand a high stiffness and creep resistance at elevated temperatures. The resulting thermoset plastics cannot be recycled, and therefore alternative materials with a reconfigurable internal network structure are in high demand. Here, we establish that such a thermoset-like yet recyclable material can be realized through the addition of a nanocellulose reinforcing agent. A network consisting of cellulose nanocrystals, nano- or microfibrils imparts many of the characteristics that are usually achieved through chemical cross-linking. For instance, the addition of only 7.5 wt % of either nanocellulose material significantly enhances the melt stiffness of an otherwise molten ethylene-acrylate copolymer by at least 1 order of magnitude. At the same time, the nanocellulose network reduces the melt creep elongation to less than 10%, whereas the neat molten matrix would rupture. At high shear rates, however, the molten composites do not display a significantly higher viscosity than the copolymer matrix, and therefore retain the processability of a thermoplastic material. Repeated re-extrusion at 140 degrees C does not compromise the thermomechanical properties, which indicates a high degree of recyclability. The versatility of dynamic nanocellulose networks is illustrated by 3D printing of a cellulose composite, where the high melt stiffness improves the printability of the resin.

Place, publisher, year, edition, pages
AMER CHEMICAL SOC , 2019. Vol. 20, no 10, p. 3924-3932
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Polymer Chemistry
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URN: urn:nbn:se:kth:diva-263355DOI: 10.1021/acs.biomac.9b00993ISI: 000490658900030PubMedID: 31525970Scopus ID: 2-s2.0-85072966263OAI: oai:DiVA.org:kth-263355DiVA, id: diva2:1371251
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QC 20191119

Available from: 2019-11-19 Created: 2019-11-19 Last updated: 2019-11-19Bibliographically approved

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Rojas, RamiroBerglund, Lars

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