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Recycling of Poly Lactic Acid Reinforced with Calcium Carbonate by Multiple Processing
University of Borås, School of Engineering. (Polymer Group)
University of Borås, School of Engineering. (Polymer Group)
2014 (English)Conference paper, (Other academic)
Sustainable development
The content falls within the scope of Sustainable Development
Abstract [en]

The upward trend of the bioplastics and biocomposites usage among consumers could have great consequence for the recycled plastics industry in the next few decades. As a result,industries’ attentions have been directed towards Poly Lactic Acid (PLA) which combines the advantages of renewable and biodegradable resources at the same time. Since PLA is more environmentally friendly compared to traditional petroleum-based commodity polymers, it has benefited from an upturned trend of interest in different markets, like the packaging, textile, and automotive industries. However, it is not applicable in many fields due to its inherent brittleness; even though it is very beneficial as the result of high strength and high modulus. Due to the low production cost of Nano calcium carbonate (nano-CaCO3) (NCC) which is useful to improve the toughness of PLA, it has reached a wide market in such industries as plastics, paints, and inks. By adding Nano calcium carbonate to polymer, thermal,crystallization, mechanical, biodegradability and melt rheological properties will be improved. The mechanical recycling of neat PLA has previously studied as well as some research on blend PLA/NCC by Sabzi et al. However, the purpose of this project is to investigate the characterization of PLA blend with Chalk (CaCo3) and Plasticizer by focusing on thermaland mechanical properties. The filler, which is 30% calcium carbonate, and 5% plasticizer compound with PLA in a two screws extruder. Plasticizer is added to composite to make it softer and it is consider constant in all samples. Multiple extrusions and compress molding are methods which can help in studying the recyclability of polymeric materials containing bioplastic and its derivatives and in figuring out the stability or service life respectively. In addition, these methods make it possible to determine the impacts of thermal and thermo mechanical degradation. Bio composite was recycled up to 6 times by using extruder equipment and crushing. The mechanical and thermal properties were characterized after each cycle by TGA, DSC,DMTA, FTIR, tensile machine and flexural test. The study represents that by introducing 30% calcium carbonate to PLA, it can be recycled up to 6 times without meeting any significant change in the mechanical and thermal properties.

Place, publisher, year, edition, pages
2014.
Keyword [en]
Recycling, PLA, biopolymer, filler, Resource recovery
National Category
Materials Chemistry
Research subject
Resource Recovery
Identifiers
URN: urn:nbn:se:hb:diva-7315Local ID: 2320/14714OAI: oai:DiVA.org:hb-7315DiVA: diva2:888028
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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