Effect of Olive Pit Reinforcement in Polylactic Acid Biocomposites on Environmental Degradation

Jurado-Contreras, Sofía; Navas-Martos, Francisco J.; Rodríguez-Liébana, José A.; La Rubia, M. Dolores

doi:10.3390/ma16175816

Cited by 3 publications

(10 citation statements)

References 40 publications

(114 reference statements)

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“…Therefore, it is logical that increasing the percentage of reinforcement resulted in a major ability of PLA composites to form interactions with water molecules. Indeed, the increase in c by incorporating lignocellulosic reinforcements in PLA has been reported in previous studies [4,36]. Various surface-modification techniques are currently being developed to enhance nanocellulose's interfacial compatibility and miscibility.…”

Section: Water Absorptionmentioning

confidence: 74%

“…In addition, these conventional plastics are non-renewable [3]. Currently, a large amount of research has been conducted to mitigate these problems in two main ways: (i) reuse and recycling of conventional plastics; (ii) manufacturing of new biodegradable polymeric materials (green composites) [2,4]. Biobased composites are hybrid materials that combine a polymeric matrix, from biological resources, with a suitable percentage of particles in order to obtain a material with improved properties.…”

Section: Introductionmentioning

confidence: 99%

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Obtaining Cellulose Nanocrystals from Olive Tree Pruning Waste and Evaluation of Their Influence as a Reinforcement on Biocomposites

Jurado-Contreras,

Navas-Martos,

García-Ruiz

et al. 2023

Polymers

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The objective of this work is to improve the mechanical properties of polylactic acid (PLA) by incorporating cellulose nanocrystals (CNC) previously obtained from a cellulose pulp extracted from olive tree pruning (OTP) waste. Composites were manufactured by melt processing and injection moulding to evaluate the effect of the introduction of CNC with conventional manufacturing methods. This OTP-cellulose pulp was subjected to a further purification process by bleaching, thus bringing the cellulose content up to 86.1%wt. This highly purified cellulose was hydrolysed with sulfuric acid to obtain CNCs with an average length of 267 nm and a degradation temperature of 300 °C. The CNCs obtained were used in different percentages (1, 3, and 5%wt.) as reinforcement in the manufacture of PLA-based composites. The effect of incorporating CNC into PLA matrix on the mechanical, water absorption, thermal, structural, and morphological properties was studied. Maximum tensile stress and Young’s modulus improved by 87 and 58%, respectively, by incorporating 3 and 5%wt. CNC. Charpy impact strength increased by 21% with 3%wt. These results were attributed to the good dispersion of CNCs in the matrix, which was corroborated by SEM images. Crystallinity index, glass transition, and melting temperatures were maintained.

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Section: Water Absorptionmentioning

confidence: 74%

Section: Introductionmentioning

confidence: 99%

Obtaining Cellulose Nanocrystals from Olive Tree Pruning Waste and Evaluation of Their Influence as a Reinforcement on Biocomposites

Jurado-Contreras,

Navas-Martos,

García-Ruiz

et al. 2023

Polymers

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“…The process conditions were Profile T: 140-190-190-190-190-190-160-190; 400 rpm. Sofía Jurado-Contreras et al [25] conducted an experiment to create a composite by combining polylactic acid (PLA) and olive pits (OPs). This process required a lower rotation speed, but the overall method for manufacturing the composite was the same as that used in our agrocomposite.…”

Section: Genesismentioning

confidence: 99%

“…Each test involved using approximately 10 mg of the sample under the specified experimental conditions: a temperature ramp of 20 • C/min within a range of 30 • C to 350 • C, with a nitrogen (N2) stream set at 50 mL/min. These tests were carried out according to UNE-EN ISO 11357 [25] and were performed in 40 µL aluminum crucibles, using a five-phase thermal program detailed in the following specifications: Equation ( 1) was used to calculate the degree of crystallinity, χ c [24,30]:…”

Section: Thermal and Rheological Propertiesmentioning

confidence: 99%

An Innovative Polypropylene/Waste Cork Composite Material for Spirit and Wine Stopper Caps

Suffo,

Pérez-Muñoz,

Alba

et al. 2024

Applied Sciences

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In the wine bottling process, thermoplastics are commonly used to manufacture the crown of cork stoppers. The production of agglomerated cork stoppers generates a type of waste called cork powder (CoP) in large volumes with known properties but which are still underutilized. At present, although there are many agrocomposites available with additives such as natural fibers or solid residues from agricultural products, there are no studies describing the formation of these agrocomposites from petroleum-derived synthetic plastics combined with cork dust as a reinforcement for the polymeric matrix. The present study describes a novel agrocomposite, which has been obtained by mixing polypropylene-type materials, as they are some of the most widely used and versatile thermoplastics, with cork dust, which is a waste product obtained from the cork industry. The composite is obtained directly, without the need for grafting, adhesive polymers, or coupling agents. A superior mechanical performance compared to the unprocessed polymer was highlighted in the test results, thus evidencing the reinforcing function played by the waste in the polymer matrix. Therefore, this novel agrocomposite could be a promising alternative to replace some petroleum-derived synthetic plastics, which are currently experiencing high demand. The use of this new agrocomposite is well aligned with sustainability strategies, the principles of the circular economy, and oriented towards the fulfilment of the Sustainable Development Goals required by the European Union, considering that it contributes (a) to recycling agricultural waste that would otherwise be difficult to recover and valorize; (b) to the reduction in the CO2 footprint; and (c) to promoting the use of high-quality secondary raw materials.

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“…PLA has various applications across various industries due to its biodegradability, renewability, and versatility. Some common applications of PLA include medical devices [21], dental implants [22,23], and food service products [24,25]. When constrained by the dimensions of the additive manufacturing platform [26], it is common practice to divide a substantial medical device into multiple segments for printing, necessitating subsequent assembly.…”

Section: Introductionmentioning

confidence: 99%

Enhancing the Weld Quality of Polylactic Acid Biomedical Materials Using Rotary Friction Welding

Kuo,

Liang,

Huang

et al. 2024

Polymers

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Polylactic acid (PLA) stands out as a biomaterial with immense potential, primarily owing to its innate biodegradability. Conventional methods for manufacturing PLA encompass injection molding or additive manufacturing (AM). Yet, the fabrication of sizable medical devices often necessitates fragmenting them into multiple components for printing, subsequently requiring reassembly to accommodate the constraints posed by the dimensions of the AM platform. Typically, laboratories resort to employing nuts and bolts for the assembly of printed components into expansive medical devices. Nonetheless, this conventional approach of jointing is susceptible to the inherent risk of bolts and nuts loosening or dislodging amid the reciprocating movements inherent to sizable medical apparatus. Hence, investigation into the joining techniques for integrating printed components into expansive medical devices has emerged as a critical focal point within the realm of research. The main objective is to enhance the joint strength of PLA polymer rods using rotary friction welding (RFW). The mean bending strength of welded components, fabricated under seven distinct rotational speeds, surpasses that of the underlying PLA substrate material. The average bending strength improvement rate of welding parts fabricated by RFW with three-stage transformation to 4000 rpm is about 41.94% compared with the average bending strength of PLA base material. The average surface hardness of the weld interface is about 1.25 to 3.80% higher than the average surface hardness of the PLA base material. The average surface hardness of the weld interface performed by RFW with variable rotational speed is higher than the average surface hardness of the weld interface performed at a fixed rotating friction speed. The temperature rise rate and maximum temperature recorded during RFW in the X-axis of the CNC turning machine at the outer edge of the welding part surpassed those observed in the internal temperature of the welding part. Remarkably, the proposed method in this study complies with the Sustainable Development Goals due to its high energy efficiency and low environmental pollution.

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Effect of Olive Pit Reinforcement in Polylactic Acid Biocomposites on Environmental Degradation

Cited by 3 publications

References 40 publications

Obtaining Cellulose Nanocrystals from Olive Tree Pruning Waste and Evaluation of Their Influence as a Reinforcement on Biocomposites

Obtaining Cellulose Nanocrystals from Olive Tree Pruning Waste and Evaluation of Their Influence as a Reinforcement on Biocomposites

An Innovative Polypropylene/Waste Cork Composite Material for Spirit and Wine Stopper Caps

Enhancing the Weld Quality of Polylactic Acid Biomedical Materials Using Rotary Friction Welding

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