Influence of Addition of Organic Fillers on the Properties of Mechanically Recycled PLA
Open accessAbstract
Poly(lactic acid) (PLA) is one of the most used biobased and biodegradable polymers. Due to their high stability, some of the newest grades of PLA are only degradable under severe industrial conditions. For these grades, mechanical recycling is a viable end-of-life option, with great environmental advantages. However, the polymer undergoes degradation during its service life and in the melt reprocessing, which leads to a decrease in properties that can compromise the recyclability of PLA. The goal of this work was to evaluate the usefulness of adding small amounts of two organic fillers, chitosan, and silk fibroin nanoparticles, during the recycling process for improving the properties of the recycled plastic. The degradation level of the aged polymer and the nature and amount of filler affect the performance of the recycled plastics. The fillers reduce the degradation during the melt reprocessing of PLA previously subjected to severe hydrolysis, thus increasing the intrinsic viscosity of the recycled plastic. A careful selection of the added organic filler lead to recycled plastics with improvements in some key mechanical, thermal, and barrier properties. Thus, the use of organic fillers represents a cost-effective and environmentally sound way for improving the mechanical recycling of bioplastics.
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Beltrán et al. (2021) reported that recycling 3D-printed PLA waste triggers an increase in crystallinity and a decrease in degradation time of the polymer due to shorter chains.
“Beltrán et al. (2021) reported that recycling 3D-printed PLA waste triggers the increase in the crystallinity and a decrease in the degradation time of the polymer by the presence of shorter chains [15].”
From Effect of Degradation During Multiple Primary Mechanical Recycling Processes on the Physical Properties and Biodegradation of Commercial PLA-Based Water Bottles (2025) · cites this paper as [15]
Section 3.2.2 reports that recycled PLA crystallizes more easily and has lower thermal stability associated with shorter polymer chains. But the study used aged, compression-molded PLA films (Section 2.3), not 3D-printed waste; it reports lower decomposition temperatures, not a shorter degradation time, and does not establish an increase in overall crystallinity. The cited paper is also not a Beltrán et al. (2021) study. (LLM, conf=0.86)
Experimental — accuracy not yet measuredPlastics used in food and beverage packaging usually contain additives that can affect polymer degradation and recyclability.
“However, the plastics used in food and beverage packaging are not exclusively composed of polymers but usually contain a number of additives that can affect polymer degradation and recyclability.”
From Effect of Degradation During Multiple Primary Mechanical Recycling Processes on the Physical Properties and Biodegradation of Commercial PLA-Based Water Bottles (2025) · cites this paper as [15]
The Abstract and Conclusions report that adding organic fillers to PLA during mechanical recycling can affect degradation and the properties of the recycled plastic. The Introduction links PLA to food packaging, but the paper does not establish that food and beverage packaging plastics usually contain additives. (LLM, conf=0.84)
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- Authors
- Beltrán, F. R., Gaspar, G., Dadras Chomachayi, M., Jalali-Arani, A., Lozano-Pérez, A. A., Cenis, J. L., de la Orden, M. U., Pérez, E., & Martínez Urreaga, J. M.
- Affiliations
- Consejo Superior de Investigaciones Científicas (ES)
- Universidad Politécnica de Madrid (ES)
- Instituto de Ciencia y Tecnología de Polímeros (ES)
- Venue
- Environmental Science and Pollution Research
- Published
- 2020-02-10
- Volume
- 28
- Issue
- 19
- Pages
- 24291-24304
- ISSN
- 0944-1344 (ISSN-L)
- 1614-7499
- OpenAlex
- W3006664749
- Cited by
- 54
- References
- 35
- Citations by year
- 2026: 5 · 2025: 12 · 2024: 12 · 2023: 8 · 2022: 8 · 2021: 5 · 2020: 4
- FWCI
- 1.63
- Type
- journal article
- Language
- en
- Open access
- green
- oa.upm.es
- Locations
- Environmental Science and Pollution Research (publishedVersion)
- PubMed (publishedVersion)
- UPM Digital Archive (Technical University of Madrid) (submittedVersion)
- Docta Complutense (Universidad Complutense de Madrid) (submittedVersion, other-oa)
- DIGITAL.CSIC (Spanish National Research Council (CSIC)) (submittedVersion)
- Hispana (submittedVersion)
- Funders
- Ministerio de Economía y Competitividad (CTM2017-88989-P)
- Universidad Politécnica de Madrid (UPM RP 160543006)
- H2020 European Research Council (project 860407-BIO-PLASTICS EUROPE)
- European Regional Development Fund ('Murcia' CCI Nº 2007ES161PO001 (Project No. 14-20/20).)
- 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 › Natural Fiber Reinforced Composites
- Keywords
- polylactic acid, mechanical recycling, organic fillers, chitosan nanoparticles, silk fibroin nanoparticles, biodegradable plastics, intrinsic viscosity, mechanical properties, thermal properties, barrier properties, end-of-life plastics
- MeSH terms
- Plastics, Polyesters, Polymers, Viscosity, Recycling
About these checks
Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.
Statistics and arithmetic are recomputed, not judged.
Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.
What counts as a claim ›How we measure confidence ›How we check this ›
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