Polylactic acid/Lignocellulosic residue composites compatibilized through a starch coating

Rocha, Daniel Belchior; Souza, Alana G.; Szostak, Marek; Rosa, Derval dos Santos

doi:10.1002/pc.25616

Cited by 15 publications

(9 citation statements)

References 30 publications

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“…PLA and TCHF were mixed in a zipped bag according to the contents indicated in Table 1. These composition ranges were selected as previous studies with lignocellulosic materials in PLA indicated that excessive loss of properties occurs with higher amounts of lignocellulosic fillers [13,48,49]. The mixtures were melt-compounded in a co-rotating twin-screw extruder (D = 25 mm, L/D = 24) from Dupra SL (Alicante, Spain), an equipment described in previous work [17].…”

Section: Preparation Of the Green Composite Piecesmentioning

confidence: 99%

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: Preparation Of the Green Composite Piecesmentioning

confidence: 99%

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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“…Such a strategy was proposed by R. Turco et al [ 2 ], where they developed a composite based on poly (lactic acid) (PLA) reinforced by epoxidized oil and presscake waste fibers from oil extraction of the Cynara cardunculus plant. Rocha et al compatibilized natural lignocellulosic residues such as sugarcane bagasse, maçaranduba, and pinus through starch also as a PLA fillers [ 3 ]. Mysiukiewicz and Barczewski also used linseed cake to make green composites on the PLA matrix [ 4 ].…”

Section: Introductionmentioning

confidence: 99%

Grafted Lactic Acid Oligomers on Lignocellulosic Filler towards Biocomposites

et al. 2022

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Lactic acid oligomers (OLAs) were in situ synthesized from lactic acid (LAc) and grafted onto chokeberry pomace (CP) particleboards by direct condensation. Biocomposites of poly (lactic acid) (PLA) and modified/unmodified CP particles containing different size fractions were obtained using a mini-extruder. To confirm the results of the grafting process, the FTIR spectra of filler particles were obtained. Performing 1HNMR spectroscopy allowed us to determine the chemical structure of synthesized OLAs. The thermal degradation of modified CP and biocomposites were studied using TGA, and the thermal characteristics of biocomposites were investigated using DSC. In order to analyse the adhesion between filler particles and PLA in biocomposites, SEM images of brittle fracture surfaces were registered. The mechanical properties of biocomposites were studied using a tensile testing machine. FTIR and 1HNMR analysis confirmed the successful grafting process of OLAs. The modified filler particles exhibited a better connection with hydrophobic PLA matrix alongside improved mechanical properties than the biocomposites with unmodified filler particles. Moreover, a DSC analysis of the biocomposites with modified CP showed a reduction in glass temperature on average by 9 °C compared to neat PLA. It confirms the plasticizing effect of grafted and ungrafted OLAs. The results are promising, and can contribute to increasing the use of agri-food lignocellulosic residue in manufacturing biodegradable packaging.

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“…This increment in thermal stability is due to the improved bonding mechanism because of silane treatment and addition of particles, which increased the weight of resin matrix. [ 27 ] Thus more energy is required to expand the free volume results in increase of thermal stability. A maximum thermal stability observed around 430°C for 4.0 vol% of SSP.…”

Section: Resultsmentioning

confidence: 99%

Synthesis and characterization of sea urchin spike strengthened grape seed oil‐epoxy composite coating material

Yakkala

Jayaraman³

et al. 2022

Polymer Composites

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High toughness grape seed oil‐epoxy based composite coating material was prepared in this present study with sea urchin (Echinoidea) spike particle (SSP) for weather protection and insect repellent anti rusting coating applications. The main aim of this research was to study the effect of adding SSP along with grape seed oil in epoxy resin composite and their mechanical, thermal and barrier properties. The SSP used in this present study was prepared from marine waste dead sea‐urchin spikes using ball‐milling process. The prepared particles are then silane treated using aminosilane via acid hydrolysis. According to the results of the present study, the hardness values showed an increment of 7% for 4.0 vol% of SSP and 10 vol% of grape seed oil for composite designation EGS4. Similarly, the wear properties showed that the sp. wear rate and COF decreases up to 0.007 mm3/Nm and 0.51 for composite designation EGS4. However, for 10 vol% of grape seed oil and 0.5 vol% minimum mechanical properties were observed. The better thermal stability was observed for composite designation EGS4 whereas the barrier properties increased with 10 vol% of grape seed oil and 0.5 vol% of SSP. Nevertheless it is noted that the addition of SSP reduces the oxygen permeability and marginally increased the water permeability. These mechanically, thermally and barrier properties strengthened epoxy bio composite coating materials could be used in food packaging, medical and household product making applications.

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Polylactic acid/Lignocellulosic residue composites compatibilized through a starch coating

Cited by 15 publications

References 30 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

Grafted Lactic Acid Oligomers on Lignocellulosic Filler towards Biocomposites

Synthesis and characterization of sea urchin spike strengthened grape seed oil‐epoxy composite coating material

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