Effect of Spent Coffee Grounds on the Crystallinity and Viscoelastic Behavior of Polylactic Acid Composites

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Autor(es): dc.contributorUniversidade Estadual Paulista (UNESP)-
Autor(es): dc.contributorUniversité Laval-
Autor(es): dc.creatorde Bomfim, Anne Shayene Campos-
Autor(es): dc.creatorde Oliveira, Daniel Magalhães-
Autor(es): dc.creatorBenini, Kelly Cristina Coelho de Carvalho-
Autor(es): dc.creatorCioffi, Maria Odila Hilário-
Autor(es): dc.creatorVoorwald, Herman Jacobus Cornelis-
Autor(es): dc.creatorRodrigue, Denis-
Data de aceite: dc.date.accessioned2025-08-21T20:48:55Z-
Data de disponibilização: dc.date.available2025-08-21T20:48:55Z-
Data de envio: dc.date.issued2025-04-29-
Data de envio: dc.date.issued2023-06-01-
Fonte completa do material: dc.identifierhttp://dx.doi.org/10.3390/polym15122719-
Fonte completa do material: dc.identifierhttps://hdl.handle.net/11449/305387-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/11449/305387-
Descrição: dc.descriptionThis work investigated the addition of spent coffee grounds (SCG) as a valuable resource to produce biocomposites based on polylactic acid (PLA). PLA has a positive biodegradation effect but generates poor proprieties, depending on its molecular structure. The PLA and SCG (0, 10, 20 and 30 wt.%) were mixed via twin-screw extrusion and molded by compression to determine the effect of composition on several properties, including mechanical (impact strength), physical (density and porosity), thermal (crystallinity and transition temperature) and rheological (melt and solid state). The PLA crystallinity was found to increase after processing and filler addition (34–70% in the 1st heating) due to a heterogeneous nucleation effect, leading to composites with lower glass transition temperature (1–3 °C) and higher stiffness (~15%). Moreover, the composites had lower density (1.29, 1.24 and 1.16 g/cm3) and toughness (30.2, 26.8 and 19.2 J/m) as the filler content increased, which is associated with the presence of rigid particles and residual extractives from SCG. In the melt state, polymeric chain mobility was enhanced, and composites with a higher filler content became less viscous. Overall, the composite with 20 wt.% SCG provided the most balanced properties being similar to or better than neat PLA but at a lower cost. This composite could be applied not only to replace conventional PLA products, such as packaging and 3D printing, but also to other applications requiring lower density and higher stiffness.-
Descrição: dc.descriptionFatigue and Aeronautical Materials Research Group Department of Materials and Technology UNESP-São Paulo State University, SP-
Descrição: dc.descriptionCenter for Research on Advanced Materials (CERMA) Department of Chemical Engineering Université Laval-
Descrição: dc.descriptionFatigue and Aeronautical Materials Research Group Department of Materials and Technology UNESP-São Paulo State University, SP-
Idioma: dc.languageen-
Relação: dc.relationPolymers-
???dc.source???: dc.sourceScopus-
Palavras-chave: dc.subjectbiocomposites-
Palavras-chave: dc.subjectmechanical properties-
Palavras-chave: dc.subjectpolylactic acid (PLA)-
Palavras-chave: dc.subjectrheological properties-
Palavras-chave: dc.subjectspent coffee grounds (SCG)-
Título: dc.titleEffect of Spent Coffee Grounds on the Crystallinity and Viscoelastic Behavior of Polylactic Acid Composites-
Tipo de arquivo: dc.typelivro digital-
Aparece nas coleções:Repositório Institucional - Unesp

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