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Mechanical recycling of polylactic acid reinforced with cellulose fibres
University of Borås, School of Engineering. (Polymer Group)
University of Borås, School of Engineering. (Polymer Group)
2014 (English)Conference paper, (Refereed)
Sustainable development
The content falls within the scope of Sustainable Development
Abstract [en]

The increased environmental awareness has drawn researchers’ attention to bio-based polymers and several polymers such as polylactic acid (PLA), Mater-bi and polyhydroxyalkanoates (PHA) have been studied extensively. It is not easy to replace conventional petro-based polymers and it is therefore likely that both petro- and bio-based polymers will coexists for a long time. The usage of bio-based polymers is however growing and this may have implications for the plastic recycling industry. The recycling of petro-based polymers is relatively well studied and, where it is cost effective, conventional, petro-based polymers are being recycled in the industry. However, the recycling of bio-based plastics and composites needs to be studied more in detail. While several bio-based polymers can be biologically degraded, it is of interest to study the mechanical recycling of these polymers. In order to minimize the energy usage and the consumption of renewable materials mechanical recycling can be a good option. PLA is an attractive polymer as it is both biodegradable and prepared from renewable materials. This polymer has received a lot of attention and several reviews have been written. Research has shown that neat PLA can be reprocessed several times without significant loss of mechanical properties. Biocomposites based on PLA reinforced with natural fibres have been studied extensively in the literature and there can be many industrial applications of these biocomposites, such as automotive components and materials for construction applications. However, the mechanical recycling of biocomposites is not well studied. Most studies in the literature concerns the recycling of polymers reinforced with wood flour. DuraPulp is a commercial quality consisting PLA fibres mixed with cellulose fibres. This biocomposite material can be processed with for example compression moulding. Adding cellulose fibres to the polymer matrix may significantly change how the material can be recycled. The purpose of this study was to study the mechanical recycling of this material. Sheets were first prepared from Durapulp. The sheets were then compression moulded, grinded and reprocessed again with compression moulding. The mechanical and thermal properties were characterized after each cycle. The feasibility to recycle Durapulp mechanically will be discussed.

Place, publisher, year, edition, pages
2014.
Keyword [en]
recycling, polylactic acid, cellulose, multiple processing, Resursåtervinning
National Category
Materials Chemistry
Research subject
Resource Recovery
Identifiers
URN: urn:nbn:se:hb:diva-7310Local ID: 2320/14596OAI: oai:DiVA.org:hb-7310DiVA: diva2:888023
Conference
Nordic polymer days, 10-12 June, 2014, Gothenburg, Sweden
Funder
Mistra - The Swedish Foundation for Strategic Environmental Research
Available from: 2015-12-22 Created: 2015-12-22 Last updated: 2017-03-01Bibliographically approved

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