scholarly journals Wheat straw pre-treatments using eco-friendly strategies for enhancing the tensile properties of bio-based polylactic acid composites

2020 ◽  
Vol 155 ◽  
pp. 112836
Author(s):  
Mehdi Chougan ◽  
Seyed Hamidreza Ghaffar ◽  
Mazen J. Al-Kheetan ◽  
Mantas Gecevicius
Keyword(s):  
Wheat Straw ◽  
Tensile Properties ◽  
Polylactic Acid

scholarly journals Effect of Intercalation Structure of Organo-Modified Montmorillonite/Polylactic Acid on Wheat Straw Fiber/Polylactic Acid Composites

Polymers ◽  
2018 ◽  
Vol 10 (8) ◽  
pp. 896 ◽  
Author(s):  
Qiqi Fan ◽  
Guangping Han ◽  
Wanli Cheng ◽  
Huafeng Tian ◽  
Dong Wang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Thermogravimetric Analysis ◽  
Wheat Straw ◽  
Polylactic Acid ◽  
Low Cost ◽  
Interlayer Spacing ◽  
Positive Influence ◽  
X Ray Diffraction ◽  
Ft Ir ◽  
Ir Analysis

In this work, an easy way to prepare the polylactic acid (PLA)/wheat straw fiber (WSF) composite was proposed. The method involved uses either the dopamine-treated WSF or the two-step montmorillonite (MMT)-modified WSF as the filler material. In order to achieve the dispersibility and exfoliation of MMT, it was modified by 12-aminododecanoic acid using a two-step route. X-ray diffraction (XRD) and scanning electron microscopy (SEM) were performed to characterize the modified MMT and the coated WSF. As for the properties of PLA/WSF composites, some thermal (using Fourier transform infrared spectroscopy (FT-IR) and thermogravimetric analysis) and mechanical properties (flexural, tensile, and impact) were analyzed. The results showed that the dopamine was successfully coated onto the WSF. Furthermore, Na-MMT was successfully transformed to organo-montmorillonite (OMMT) and formed an exfoliated structure. In addition, a better dispersion of MMT was obtained using the two-step treatment. The interlayer spacing of modified MMT was 4.06 nm, which was 123% higher than that of the unmodified MMT. Additionally, FT-IR analysis suggested that OMMT diffused into the PLA matrix. The thermogravimetric analysis (TGA) showed that a higher thermal stability of PLA/WSF composites was obtained for the modified MMT and dopamine. The results also showed that both the dopamine treated WSF and the two-step-treated MMT exhibited a positive influence on the mechanical properties of PLA/WSF composites, especially on the tensile strength, which increased by 367% compared to the unmodified precursors. This route offers researchers a potential scheme to improve the thermal and mechanical properties of PLA/WSF composites in a low-cost way.

scholarly journals Polylactic acid (PLA) based green composites reinforced pineapple leaf fibres: evaluation of processing and tensile performance

2018 ◽  
Vol 192 ◽  
pp. 03002
Author(s):  
Jedsada Chaishome ◽  
Suriyan Supapvanich
Keyword(s):  
Tensile Properties ◽  
Polylactic Acid ◽  
Detrimental Effect ◽  
Process Variables ◽  
Compression Moulding ◽  
Stiffness Modulus ◽  
Vacuum Forming ◽  
Tensile Performance ◽  
The Matrix ◽  
Consolidation Temperature

This paper reports on a study of the compression moulding and the vacuum forming of unidirectional pineapple leaf fibres/polylactic acid composites and the influence of process variables on the tensile properties of the material. The characterisation of the micro and meso structures of the pineapple leaf fibres is reported. The effect of consolidation temperature on the fibre thermal stability and the tensile properties of the composites is investigated. The results show that vacuum forming was found to be preferable process with high stiffness modulus and UTS of the composites, compared to compression moulding. The insignificant detrimental effect of 165°C high consolidation temperature was observed. Finally, the fibre thermal degradation seems to dominate the composite tensile performance over its interfacial quality between the fibre and the matrix.

Crushing Response of Green Square Honeycomb Structure from Sugar Palm & PLA

2017 ◽  
Vol 909 ◽  
pp. 122-126 ◽  
Author(s):  
Zahidah Ansari ◽  
Mohd Ruzaimi Mat Rejab ◽  
Dandi Bachtiar ◽  
Januar Parlaungan Siregar
Keyword(s):  
Tensile Properties ◽  
Polylactic Acid ◽  
Short Fiber ◽  
Honeycomb Structure ◽  
Result Show

Experiment investigation were conducted on square honeycomb structure made out of sugar palm reinforced polylactic acid (PLA). This paper investigate the compression and tensile properties of new and recycled sugar palm/PLA composite. Short fiber were obtain by crushing and then mix with PLA before being hot pressed at 180°C. The 3mm plate were then developed into sandwich square honeycomb structure. The result show small decrement in strength pattern.

scholarly journals Tensile properties of PolyLactic Acid Composite Foamed via Supercritical Carbon Dioxide

2021 ◽  
Vol 2129 (1) ◽  
pp. 012007
Author(s):  
N M Nordin ◽  
H Anuar ◽  
F Ali ◽  
Y F Buys
Keyword(s):  
Thin Films ◽  
Carbon Dioxide ◽  
Tensile Strength ◽  
Supercritical Carbon Dioxide ◽  
Essential Oil ◽  
Tensile Properties ◽  
Polylactic Acid ◽  
Treatment Period ◽  
Cinnamon Essential Oil ◽  
Supercritical Carbon

Abstract Tensile properties of foamed PolyLactic Acid (PLA) composite were studied. In this work, PLA were incorporate with Durian Skin Fibre (DSF) and Cinnamon Essential Oil (CEO) to form PLA bio composite and further treat via supercritical carbon dioxide (SCCO2) to form foamed PLA bio composite. The tensile strength value of foamed PLA bio composite slightly drops from foamed PLA. As for stress strain graph, the percentage of strain for foamed PLA and PLA bio composite did not distinct much. Through SEM, the foamed PLA bio composite showing that it did not fully foamed after treated via SCCO2 which due to treatment period and the thickness of the thin films.

202 Microstructure and Tensile Properties of Polylactic acid by Colded Rolling Process

2015 ◽  
Vol 2015.51 (0) ◽  
pp. _202-1_-_202-2_
Author(s):  
Lijun WANG ◽  
Jianhui QIU ◽  
Eiichi SAKAI ◽  
Makoto KUDO ◽  
Rie NOBE
Keyword(s):  
Tensile Properties ◽  
Polylactic Acid ◽  
Rolling Process

Tensile Properties of Polylactic Acid (PLA) Additive Manufactured Parts

2015 ◽  
Author(s):  
Joselyn Cardenas ◽  
Calvin M. Stewart
Keyword(s):  
Brittle Fracture ◽  
Tensile Properties ◽  
Young’S Modulus ◽  
Polylactic Acid ◽  
Young's Modulus ◽  
Tensile Tests ◽  
Image Correlation ◽  
Test Machine ◽  
Heterogeneous Structure ◽  
Part Quality

In the advancement of Additive Manufacturing (AM) technologies, 3D desktop printers have become an accessible solution to address the current manufacturing practices for most industries and the general public. This study explores the effect default build parameters have on the tensile properties of additive manufactured parts by comparing the Young’s Modulus and tensile strength of polylactic acid (PLA) in the elastic region before and after the AM process through experiments and numerical simulations. The build parameters are specified via MakerBot Desktop — the file preparation software for the MakerBot Replicator 3D printer used to create the specimens tested herein. This work presents the tensile mechanical properties for specimens built using low infill rate, low layer resolution, and standard build speed and extrusion temperature to recreate the worst possible part quality attainable using MakerBot 3D Desktop printers. Using these build parameters results in a part with a hollow honeycomb interior structure, and due to its heterogeneous cross sectional area, experimental stress-strain curves do not accurately represent its physical response to tensile loading. Therefore in this case, an experimental-numerical study of the 3D printed specimens is performed, using the load-displacement experimental data acquired from tensile tests to calibrate the ANSYS Structural Mechanics simulations. The goal is to optimize the material properties in our simulation such that the equivalent strain magnitude matches the experiments. This is an approach to determine the experimental Young’s modulus of PLA additive manufactured parts where the AM process, heterogeneous structure, and size greatly influence the part strength. This is completed by studying the worst part quality possible first to better understand this effect. Tensile tests are performed using an ADMET 5603 Universal Test Machine (UTM) synched with a Correlated Solutions 3D Digital Image Correlation (DIC) system. A fine heterogeneous speckle pattern is sprayed on the specimens and used by the DIC system to obtain surface contours of deformation. This data is compared to the displacement fields in the finite element analysis (FEA) simulation of the specimen. When compared to the pre-manufacturing PLA, additive manufactured parts exposed that the post-processed stiffness of the material is increased when tested under this loading condition. The Poisson’s ratio for printed PLA was also noted to decrease when compared to pre-manufactured PLA, due to the larger longitudinal deformation compared to the transverse. Specimens failed by brittle fracture across the hex pattern, showing limited deformation and failing short after. The failure location based on the influence interior geometry has on failure showed that specimens failed by brittle fracture across the hex pattern, initiating fracture in the same region of all specimens.

Interfacial modified unidirectional wheat straw/polylactic acid composites

2020 ◽  
pp. 152808372091817
Author(s):  
Wuzhou Li ◽  
Liangang Zheng ◽  
Defang Teng ◽  
Dongsheng Ge ◽  
Farial I Farha ◽  
...  
Keyword(s):  
Wheat Straw ◽  
Polylactic Acid ◽  
Bending Strength ◽  
Good Mechanical Property ◽  
Compression Method ◽  
Thermal Compression ◽  
Biodegradable Composite ◽  
The Matrix ◽  
Microscopy Images ◽  
Modification Treatment

Among the agricultural crops, wheat is one of the most important and broadly planted food crops. However, abundant wheat straw resources were used to incinerate, which was a great waste of fiber resources, and meanwhile caused great pollution to the ecological environment. In this work, a simple hot compress method that used intact wheat straw with different volume fractions (20% and 30%) as a filler to reinforce the polylactic acid resin was explored to prepare a biodegradable composite by thermal compression method. Initially, the compressed wheat straw exhibited excellent tensile strength (96.86 MPa), even higher than intact wheat straw (92.18 MPa). The surface modification treatment was carried out with 2% and 4% concentrations of sodium hydroxide (NaOH). Then the tensile and bending strength of the modified wheat straw/polylactic acid composites were 32.41 MPa and 78.52 MPa, which were 22.16% and 22.44% higher than those of the untreated composites. The scanning electron microscopy images of the surface of modified wheat straw and fractured composite cross section revealed significantly rougher surface morphology and stronger interfacial bonding with the matrix. This work demonstrated the feasibility and good mechanical property of the composites reinforced with intact wheat straw by simple hot compression method, which provided a possible strategy to utilize the straw materials for multiple applications.

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