Development of Polypropylene Composites with Green Coffee Cake Fibers Subjected to Water Vapor Explosion

Brito, Elisa Barbosa de; Tienne, Lucas Galhardo Pimenta; Cordeiro, Suellem Barbosa; Marques, Maria de Fátima Vieira

doi:10.1007/s12649-019-00929-x

Cited by 4 publications

(7 citation statements)

References 42 publications

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“…One can expect that with a greater interaction between filler and biopolymer matrix, which can be achieved by modifying the fiber surface during the torrefaction step, there would be a restriction on the movement of the macromolecular chains located on the surface of the fillers and, hence, an increase in T g [74]. However, the reduction attained in T g , also observed by DSC, suggests that the fillers allowed an increase in the free volume in the green composites, thus indicating low compatibility or poor interaction with PLA [70]. This behavior confirms that the movement of the amorphous PLA was promoted by the coffee waste derived lignocellulosic fillers and it suggests that shorter biopolymer chains were formed due to a chain scission.…”

Section: Discussionmentioning

confidence: 99%

“…This last mass loss is due to the degradation of the lignin fraction present in CHF and TCHF [11,69]. In this regard, de Brito et al [70] showed that green coffee cake (GCC), a solid by-product of the coffee processing industry, resulting from the extraction of oil by the cold pressing technique, also presented three regions of mass loss, similar to other lignocellulosic biomasses. The first one was observed between 50 and 100 • C, the second one between 200 and 300 • C, and the last one between 275 and 400 • C. The authors ascribed the second and third mass losses to hemicellulose depolymerization in combination with temperature-induced glycosidic cleavage and to lignin components and cellulose degradation, respectively.…”

Section: Thermal Performance Of the Green Composite Piecesmentioning

confidence: 99%

“…In particular, the DTG curves showed an increase in the pyrolysis peak related to the degradation temperature (T deg ) from 347.4 • C, for neat PLA, up to 354.7 • C, for the PLA/20TCHF composite. The increase in the thermal stability of the green composite pieces can be related to the "barrier" effect of the decomposition of the biopolymer material by the lignocellulosic fillers, which promoted an increase of the degradation temperature [70]. However, a decrease in the temperature at the mass loss of 5% (T 5% ), which corresponds to the onset degradation temperature, was observed for TCHF contents above 30 wt%.…”

Section: Thermal Performance Of the Green Composite Piecesmentioning

confidence: 99%

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Torrefaction of Coffee Husk Flour for the Development of Injection-Molded Green Composite Pieces of Polylactide with High Sustainability

et al. 2020

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Coffee husk, a major lignocellulosic waste derived from the coffee industry, was first ground into flour of fine particles of approximately 90 µm and then torrefied at 250 °C to make it more thermally stable and compatible with biopolymers. The resultant torrefied coffee husk flour (TCHF) was thereafter melt-compounded with polylactide (PLA) in contents from 20 to 50 wt% and the extruded green composite pellets were shaped by injection molding into pieces and characterized. Although the incorporation of TCHF reduced the ductility and toughness of PLA, filler contents of 20 wt% successfully yielded pieces with balanced mechanical properties in both tensile and flexural conditions and improved hardness. Contents of up to 30 wt% of TCHF also induced a nucleating effect that favored the formation of crystals of PLA, whereas the thermal degradation of the biopolyester was delayed by more than 7 °C. Furthermore, the PLA/TCHF pieces showed higher thermomechanical resistance and their softening point increased up to nearly 60 °C. Therefore, highly sustainable pieces were developed through the valorization of large amounts of coffee waste subjected to torrefaction. In the Circular Bioeconomy framework, these novel green composites can be used in the design of compostable rigid packaging and food contact disposables.

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Section: Discussionmentioning

confidence: 99%

Section: Thermal Performance Of the Green Composite Piecesmentioning

confidence: 99%

Section: Thermal Performance Of the Green Composite Piecesmentioning

confidence: 99%

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Torrefaction of Coffee Husk Flour for the Development of Injection-Molded Green Composite Pieces of Polylactide with High Sustainability

et al. 2020

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“…This residue contains about 39% hemi-cellulose and 12% cellulose. The green coffee press cake is a residue of the cold-pressing extraction process of coffee essential oil from unroasted green beans [4,34,36,37].…”

Section: Coffee Processing By-productsmentioning

confidence: 99%

Biocomposites of Cellulose Isolated from Coffee Processing By-Products and Incorporation in Poly(Butylene Adipate-Co-Terephthalate) (PBAT) Matrix: An Overview

Gondim,

Rodrigues,

Aguiar

et al. 2024

Polymers

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With its extensive production and consumption, the coffee industry generates significant amounts of lignocellulosic waste. This waste, primarily comprising coffee biomasses, is a potential source of cellulose. This cellulose can be extracted and utilized as a reinforcing agent in various biocomposites with polymer matrices, thereby creating high-value products. One such biodegradable polymer, Poly(butylene adipate-co-terephthalate) (PBAT), is notable for its properties that are comparable with low-density polyethylene, making it an excellent candidate for packaging applications. However, the wider adoption of PBAT is hindered by its relatively high cost and lower thermomechanical properties compared with conventional, non-biodegradable polymers. By reinforcing PBAT-based biocomposites with cellulose, it is possible to enhance their thermomechanical strength, as well as improve their water vapor and oxygen barrier capabilities, surpassing those of pure PBAT. Consequently, this study aims to provide a comprehensive review of the latest processing techniques for deriving cellulose from the coffee industry’s lignocellulosic by-products and other coffee-related agro-industrial wastes. It also focuses on the preparation and characterization of cellulose-reinforced PBAT biocomposites.

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“…Brito et al 39 applied the steam explosion process to partially extract amorphous components of green coffee press cake (GCC). It investigated the best retention time for GCC fibers, and the ones that presented the best thermal stability were chosen to be further incorporated into the polymer matrix to manufacture composites.…”

Section: Introductionmentioning

confidence: 99%

Alkaline pretreatment and steam explosion process on coffee silverskin and incorporation of cellulose fibers in poly(butylene adipate‐co‐terephthalate)

Gondim,

Rodrigues,

Tienne

et al. 2024

J of Applied Polymer Sci

Self Cite

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In this work, coffee silverskin (CSS) fibers were subjected to alkali pretreatment (ALK‐CSS) and alkali pretreatment, followed by a 4‐bar steam explosion process (SEW4). Both treated fibers presented a higher degree of crystallinity, enhanced thermal resistance and also cleaner, rough, and defibrillated surface due to the removal of noncellulosic components, as was shown in scanning electron microscopy, thermogravimetric analysis, Fourier‐transform infrared spectra, and x‐ray diffraction (XRD) results. The SEW4 fibers were incorporated into the poly(butylene adipate‐co‐terephthalate) (PBAT) matrix in contents up to 5% wt. through melt processing. PBAT/SEW4 composites were evaluated by their microstructure, thermal properties, degree of crystallinity, and hydrophilic behavior. XRD results showed PBAT/SEW4 composites with higher degrees of crystallinity and contact angle tests revealed increased composite hydrophobicity with the increase of SEW4 content in the PBAT matrix. This work describes the importance of recovering coffee lignocellulosic waste and producing value‐added by‐products, especially in packaging manufacturing.

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Development of Polypropylene Composites with Green Coffee Cake Fibers Subjected to Water Vapor Explosion

Cited by 4 publications

References 42 publications

Torrefaction of Coffee Husk Flour for the Development of Injection-Molded Green Composite Pieces of Polylactide with High Sustainability

Torrefaction of Coffee Husk Flour for the Development of Injection-Molded Green Composite Pieces of Polylactide with High Sustainability

Biocomposites of Cellulose Isolated from Coffee Processing By-Products and Incorporation in Poly(Butylene Adipate-Co-Terephthalate) (PBAT) Matrix: An Overview

Alkaline pretreatment and steam explosion process on coffee silverskin and incorporation of cellulose fibers in poly(butylene adipate‐co‐terephthalate)

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