Crystallinity and impact strength improvement of wood-polylactic acid biocomposites produced by rotational and compression molding

Pérez‐Fonseca, Aida Alejandra; Ramírez-Herrera, Verónica Olimpia; Talavera, Francisco Javier Fuentes; Rodrigue, Denis; Silva-Guzmán, José Antonio; Robledo‐Ortíz, Jorge R.

doi:10.4067/s0718-221x2021000100436

Cited by 4 publications

(5 citation statements)

References 37 publications

(60 reference statements)

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“…In the biocomposites manufactured in this study, the decrease in E t as a consequence of the degradation process also occurred. Nevertheless, there was an increase in σ m in PLAD-based biocomposites compared to PLA-based biocomposites, which was due to the higher crystallinity of the biocomposites after the degradation process [33].…”

Section: Mechanical Properties Of Biocompositesmentioning

confidence: 93%

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

Jurado-Contreras,

Navas-Martos,

Rodríguez-Liébana

et al. 2023

Materials

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Polylactic acid (PLA) is a biomaterial widely used as an alternative to petroleum-based polymeric matrices in plastic components. PLA-based biocomposites reinforced with lignocellulosic waste are currently receiving special attention owing to their mechanical properties, low toxicity, recyclability, and biodegradability. The influence of the percentage of waste on their properties and resistance to degradation are some of the points of great relevance. Therefore, a series of PLA-based biocomposites containing different percentages of olive pits (5, 15, 25 and 40% wt.) were manufactured and characterized both (a) immediately after manufacture and (b) after one year of storage under environmental conditions. The results obtained were analyzed to evaluate the influence of the incorporation of olive pits on the resistance to degradation (measured through Carbonyl Indices, CI), mechanical properties (tensile, flexural and impact strength), structure (Fourier Transform Infrared Spectroscopy, FT-IR; and, X-ray Diffraction, XRD), morphology (Scanning Electron Microscopy, SEM) and water absorption capacity of the manufactured materials. PLA degradation, corroborated by Differential Scanning Calorimetry (DSC), FT-IR, and XRD, resulted in a decrease in tensile and flexural strengths and an increase in the tensile and flexural moduli. This trend was maintained for the biocomposites, confirming that reinforcement promoted the PLA degradation.

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Section: Mechanical Properties Of Biocompositesmentioning

confidence: 93%

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

Jurado-Contreras,

Navas-Martos,

Rodríguez-Liébana

et al. 2023

Materials

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“…The analysis of the presented values has revealed that the registered storage modulus E values differ from those presented in [32,33] by about 2.5-3 times. As in the case of static measurements, this is most probably caused by the implemented infill ratio.…”

Section: Results Of Cyclic Testsmentioning

confidence: 72%

“…In [32], the authors determined the storage modulus E for PLA on the basis of a three-point bending test. The test was carried out for the frequency of f = 1 Hz and for the strain amplitude of ε 0 = 0.03.…”

Section: Results Of Cyclic Testsmentioning

confidence: 99%

Compression Strength of PLA Bolts Produced via FDM

et al. 2022

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The aim of this research was to define the compression strength of polylactic acid bolts produced using the fused deposition modelling method. In accomplishing this, static and cyclic compression tests for different metric thread sizes were carried out in accordance with ISO 4014. Tests were conducted on M42, M48, M56, M60, and M64 threads, while samples with three different types of pitch—one nominal and two fine threads—were prepared for each diameter. Standard ISO 604 for defining the compression modulus Ec was implemented as the test basis. Accordingly, the mean compression modulus value Ec for all measurements was 917.79 ± 184.99 MPa. Cyclic compression tests were then carried out on samples with the M64 × 4 thread. Fifty thread loading cycles were carried out for each variant to obtained different strain amplitude values and strain frequencies. Our work indicated that the values of the storage modulus defined in cyclic tests E′ increased, while the values of the loss modulus E″ decreased when the value of the strain frequency increased. We found it not possible to determine the nature of the changes in the value of the storage modulus E′ in the function of the strain amplitude. We did, however, observe an increase in the value of the loss modulus E″, together with the increase in the tested range of the strain amplitude. The determined mechanical values can be therefore be used for designing threaded connections made of polylactic acid using the fused deposition modelling method.

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“…Pérez-Fonseca et al [31] used compression and rotational molding techniques to prepare PLA composites with white ash and tzalam. They found that annealing improved crystallinity, as well as thermal and dimensional stability of composites.…”

Section: Properties Of Natural Fibre Composite Materials Based On Plamentioning

confidence: 99%

Characteristics of composite materials based on polylactic acid (PLA)

Drpić

2023

Tehnika

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Polylactic acid (PLA) is aliphatic thermoplastic polyester. Composites based on PLA are biocompatible, biodegradable and non-toxic, which are the main advantages of using such composites. Based on the research results described in this paper, it was concluded that by adding natural fibers to the composite, certain characteristics can be significantly improved. This paper describes some of composite material characteristics based on PLA, modification of PLA, advantages and disadvantages of using PLA in composite materials, composition and methods of obtaining PLA-based composites, as well as the advantages of using wood plastic composites (WPC) based on PLA.

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Crystallinity and impact strength improvement of wood-polylactic acid biocomposites produced by rotational and compression molding

Cited by 4 publications

References 37 publications

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

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

Compression Strength of PLA Bolts Produced via FDM

Characteristics of composite materials based on polylactic acid (PLA)

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