Cited by 66Natural Fiber Reinforced Compositesbiodegradable polymer synthesis and propertiesPolymer crystallization and properties

The DOI matches its Crossref record; 58 of the 58 references it cites were found in a registry or an index.

Effect of Mechanical Recycling on the Mechanical Properties of PLA-Based Natural Fiber-Reinforced Composites

Open access
Finnerty, James, Rowe, Steven, Howard, Trevor, Connolly, Shane, Doran, Christopher, Devine, Declan M., Gately, Noel M., Chyzna, Vlasta, Portela, Alex, Bezerra, Gilberto Silva Nunes, McDonald, Paul, Colbert, Declan Mary·2023·Journal of Composites Science

Abstract

The present study investigates the feasibility of utilizing polylactic acid (PLA) and PLA-based natural fiber-reinforced composites (NFRCs) in mechanical recycling. A conical twin screw extrusion (CTSE) process was utilized to recycle PLA and PLA-based NFRCs consisting of 90 wt.% PLA and a 10 wt.% proportion of either basalt fibers (BFs) or halloysite nanotubes (HNTs) for up to six recycling steps. The recycled material was then injection molded to produce standard test specimens for impact strength and tensile property analysis. The mechanical recycling of virgin PLA led to significant discoloration of the polymer, indicating degradation during the thermal processing of the polymer due to the formation of chromatophores in the structure. Differential scanning calorimetry (DSC) analysis revealed an increase in glass transition temperature (Tg) with respect to increased recycling steps, indicating an increased content of crystallinity in the PLA. Impact strength testing showed no significant detrimental effects on the NFRCs’ impact strength up to six recycling steps. Tensile testing of PLA/HNT NFRCs likewise did not show major decreases in values when tested. However, PLA/BF NFRCs exhibited a significant decrease in tensile properties after three recycling steps, likely due to a reduction in fiber length beyond the critical fiber length. Scanning electron microscopy (SEM) of the fracture surface of impact specimens revealed a decrease in fiber length with respect to increased recycling steps, as well as poor interfacial adhesion between BF and PLA. This study presents a promising initial view into the mechanical recyclability of PLA-based composites.

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Crossref · 10.3390/jcs7040141

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  • Finnerty et al. (2023) showed discoloration and decrease in tensile properties of natural-fiber-reinforced PLA, and an increase in glass transition temperature and crystallinity of PLA after six recycling processes.

    “Finnerty et al. (2023) showed the discoloration and decrease in tensile properties of natural-fiber-reinforced PLA, in addition to the increase in glass transition temperature and crystallinity of PLA after six recycling processes [14].”

    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 [14]

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Research works printed but not linked: 2

  1. Averous, L. (2008). Monomers, Polymers and Composites from Renewable Resources, Elsevier.
  2. Mokrzycki, 2011, Color difference Delta E—A survey, Mach. Graph. Vis., 20, 383

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Metadata

Authors
Finnerty, J., Rowe, S., Howard, T., Connolly, S., Doran, C., Devine, D. M., Gately, N. M., Chyzna, V., Portela, A., Bezerra, G. S. N., McDonald, P., & Colbert, D. M.
Affiliations
  • Technological University of the Shannon: Midlands Midwest (IE)
  • Centre for Industrial Services and Design, Technological University of the Shannon, University Road, N37HD68 Athlone, Ireland
Corresponding author
  • Finnerty, James
  • Colbert, Declan Mary
Venue
Journal of Composites Science
Publisher
MDPI AG
Published
2023-04-06
Volume
7
Issue
4
Pages
141
ISSN
2504-477X (ISSN-L)
OpenAlex
W4362669540
Cited by
66
References
58
Citations by year
2026: 25 · 2025: 25 · 2024: 13 · 2023: 3
FWCI
5.02
Type
journal article
Language
en
Open access
Locations
  • Journal of Composites Science (publishedVersion, cc-by)
  • Research@THEA (submittedVersion, cc-by)
Topics
  • Physical Sciences › Materials Science › Polymers and Plastics › Natural Fiber Reinforced Composites
  • Physical Sciences › Materials Science › Biomaterials › biodegradable polymer synthesis and properties
  • Physical Sciences › Materials Science › Polymers and Plastics › Polymer crystallization and properties
Keywords
polylactic acid, mechanical recycling, natural fiber composites, basalt fiber, halloysite nanotubes, impact strength, tensile properties, glass transition temperature, fiber length reduction, interfacial adhesion

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