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On the Recycling of a Biodegradable Polymer: Multiple Extrusion of Poly (Lactic Acid)
Open accessAbstract
Poly (lactic acid) (PLA) was submitted up to five cycles of extrusion in order to evaluate the effect of mechanical recycling. The material was evaluated under two conditions, thoroughly dried before processing and without drying. The changes in the molecular weight, acidity, thermal properties and coloring were assessed after each extrusion, and with this information, mechanisms of degradation were purposed. Molecular weight was reduced at a maximum of 30% after the most aggressive condition; five cycles without drying, which caused also an increase in acidity due to hydrolysis. Thermal properties were not significantly altered, which in combination to the molecular weight decrease allow to infer the recyclability of PLA. However, the most degraded samples had developed strong yellowing, particularly for samples without drying, which could be a problem for final products.
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“Structural analysis revealed a progressive degradation, evidenced by a great reduction in the molar mass and increase in the melt flow index, attributed both to the chain scission derived from the thermal degradation and shear stresses of the extrusion process, and hydrolysis at the ester linkage of the polymer.”
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Metadata
- Authors
- Gonçalves, L. M. G., Rigolin, T. R., Frenhe, B. M., & Bettini, S. H. P.
- Affiliations
- Universidade Federal de São Carlos (BR)
- Venue
- Materials Research
- Publisher
- FapUNIFESP (SciELO)
- Published
- 2020
- Volume
- 23
- Issue
- 5
- ISSN
- 1516-1439 (ISSN-L)
- 1980-5373
- OpenAlex
- W3108266037
- Cited by
- 37
- References
- 29
- Citations by year
- 2026: 4 · 2025: 9 · 2024: 4 · 2023: 14 · 2022: 5 · 2021: 1
- FWCI
- 1.30
- Type
- journal article
- Language
- en
- Open access
- diamond
- doi.org
- Licence
- Locations
- Materials Research (publishedVersion, cc-by)
- LA Referencia (Red Federada de Repositorios Institucionales de Publicaciones Científicas) (publishedVersion, other-oa)
- DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
- Funders
- Fundação de Amparo à Pesquisa do Estado de São Paulo (11/21313-1)
- Coordenação de Aperfeiçoamento de Pessoal de Nível Superior ((Code 001))
- Conselho Nacional de Desenvolvimento Científico e Tecnológico
- Topics
- Physical Sciences › Materials Science › Biomaterials › biodegradable polymer synthesis and properties
- Physical Sciences › Materials Science › Polymers and Plastics › Polymer crystallization and properties
- Physical Sciences › Materials Science › Polymers and Plastics › Polymer Science and PVC
- Keywords
- polylactic acid, mechanical recycling, extrusion, biodegradable polymers, molecular weight reduction, hydrolysis, thermal properties, yellowing, polymer degradation mechanisms
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