The Influence of Sub-Zero Conditions on the Mechanical Properties of Polylactide-Based Composites

Mysiukiewicz, Olga; Barczewski, Mateusz; Kloziński, Arkadiusz

doi:10.3390/ma13245789

Cited by 5 publications

(6 citation statements)

References 66 publications

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“…[4] Also, PLA offers great potential in the fabrication of fiber-reinforced plastic composites. [5,6] The main benefits of PLA over conventional plastics are its biodegradability and eco-friendliness. [7] The cost of production of PLA is also lower than that of petroleum-based polymers, with reduced energy consumption of between 25% and 55%.…”

Section: Introductionmentioning

confidence: 99%

The lanolin‐based oil plasticized polylactide: Thermal and chemical characteristics

Okpuwhara

Oboirien

Sadiku

2022

Polymer Engineering & Sci

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Bio‐based plasticizers are a significant replacement for petrochemical‐based plasticizers because they are from renewable resources. The plasticizing effect of lanolin‐based oil at a different concentration and as an additive on polylactide's thermal and chemical stability (PLA) was investigated. The thermal stability was assessed using thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC). The plasticized PLA samples were also analyzed with a dynamic mechanical analyzer (DMA), X‐ray powder diffraction (powder XRD), and infrared (IR) spectroscopy. The plasticizer modified the thermal stability of the PLA polymer by increasing the cold crystallization temperature (Tcc), as shown by DSC. At the same time, the DMA data indicated a reduction in the dynamic storage modulus and glass transition temperature (Tg) with increased amounts of plasticizer content. The powder X‐ray diffraction patterns showed that the PLA has no polymorphic crystalline transition with the oil plasticizer. The analysis from the results shows the oil additive's potential as a bio‐based plasticizer for PLA However, further performance improvements are required for large‐scale production. From the results obtained, there are enhancements in the thermal and physical properties of the modified PLA, and it is suitable for composite production.

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Section: Introductionmentioning

confidence: 99%

The lanolin‐based oil plasticized polylactide: Thermal and chemical characteristics

Okpuwhara

Oboirien

Sadiku

2022

Polymer Engineering & Sci

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“…The pure PLA samples have the highest tensile strain and bending strain values of 4 ± 0.7% for tension and 2.24 ± 0.42% for bending, respectively. The use of CS fiber reduced the strain to about 1.53–2.34% for tensile and 1.6–1.79% for bending, which is a frequently observed effect of lignocellulosic particle filler [ 60 ].…”

Section: Resultsmentioning

confidence: 99%

“…Deterioration of the mechanical properties of PLA/CS composites relative to pure PLA is related to the poor interfacial adhesion occurring between the hydrophilic lignocellulosic CS fiber and the hydrophobic polymer matrix. The weak interfacial adhesion results in poor stress transfer between the composite components [ 60 , 61 ]. As the fiber diameter increases, the contact area with the matrix increases which causes an increase in stress intensification points and defects leading to the formation of sites for crack initiation causing sample failure even at lower loading values.…”

Section: Resultsmentioning

confidence: 99%

Influence of the Size of the Fiber Filler of Corn Stalks in the Polylactide Matrix Composite on the Mechanical and Thermomechanical Properties

et al. 2021

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This paper presents results of a study on the effect of filler size in the form of 15 wt% corn stalk (CS) fibers on the mechanical and thermomechanical properties of polylactide (PLA) matrix composites. In the test, polylactidic acid (PLA) is filled with four types of length of corn stalk fibers with a diameter of 1 mm, 1.6 mm, 2 mm and 4 mm. The composites were composed by single screw extrusion and then samples were prepared by injection molding. The mechanical properties of the composites were determined by static tensile test, static bending test and Charpy impact test while the thermo-mechanical properties were determined by dynamic mechanical thermal analysis (DMTA). The composite structures were also observed using X-ray microcomputed tomography and scanning electron microscopy. In the PLA/CS composites, as the filler fiber diameter increased, the degradation of mechanical properties relative to the matrix was observed including tensile strength (decrease 22.9–51.1%), bending strength (decrease 18.9–36.6%) and impact energy absorption (decrease 58.8–69.8%). On the basis of 3D images of the composite structures for the filler particles larger than 2 mm a weak dispersion with the filler was observed, which is reflected in a significant deterioration of the mechanical and thermomechanical properties of the composite. The best mechanical and thermomechanical properties were found in the composite with filler fiber of 1 mm diameter. Processing resulted in a more than 6-fold decrease in filler fiber length from 719 ± 190 µm, 893 ± 291 µm, 1073 ± 219 µm, and 1698 ± 636 µm for CS1, CS1.6, CS2, and CS4 fractions, respectively, to 104 ± 43 µm, 123 ± 60 µm, 173 ± 60 µm, and 227 ± 89 µm. The fabricated green composites with 1 to 2 mm corn stalk fiber filler are an alternative to traditional plastic based materials in some applications.

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“… 1 Measurement conditions and an in-depth interpretation of the results can be found in our previous paper [ 19 ]. 2 Measurement conditions and an in-depth interpretation of the results can be found in our previous paper [ 20 ]. …”

Section: Figurementioning

confidence: 99%

“…As a result of the presence of various components such as rigid lignocellulosic particles and the oil fraction, LC is an effective filler for PLA. As it was shown in our previous studies, the linseed oil contained in this waste filler has the most significant impact on the properties of the resulting composites, improving the crystallization rate [ 18 ], reducing the brittleness of the material [ 19 ], and changing its sub-zero mechanical properties [ 20 ]. The LC-filled polylactide composites are complex multiphase materials that are gaining ground in scientific research and potential high-quality polymeric composites, which can be used in various industrial applications, but the tribological properties such as friction, wear, and hardness of the composites modified with linseed cake is still an obscure area.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the Oil-Rich Waste Fillers’ Influence on the Tribological Properties of Polylactide-Based Composites

et al. 2022

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In recent years, natural-based polymeric composites have gained the attention of researchers and the industry due to their low environmental impact and good applicational properties. A promising example of these materials is polylactide-based composites filled with linseed cake. Even though they can be characterized by reduced brittleness and enhanced crystallization rate, their applicational potential cannot be fully evaluated without knowing their tribological properties. This paper is aimed to analyze the influence of the oil contained by the filler on the mechanical and frictional properties of polylactide-based composites. Specimens of unfilled polylactide and its composites containing 10 wt % of linseed cake with different oil content were prepared by injection molding. Their microhardness was measured by the Vickers method. The softening temperature was determined by the Vicat method. The scratch resistance of the samples was tested with the loading of 10, 20, and 40 N. The coefficient of friction was evaluated by the pin-on-plate method, using CoCrMo alloy as the counter surface. It was found that the oil content in the filler does not directly influence the mechanical and tribological properties, but the composite samples present comparable hardness and lower coefficient of friction than the unfilled polymer, so they can be a good eco-friendly alternative to the unfilled polylactide when the frictional properties are an important factor.

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The Influence of Sub-Zero Conditions on the Mechanical Properties of Polylactide-Based Composites

Cited by 5 publications

References 66 publications

The lanolin‐based oil plasticized polylactide: Thermal and chemical characteristics

The lanolin‐based oil plasticized polylactide: Thermal and chemical characteristics

Influence of the Size of the Fiber Filler of Corn Stalks in the Polylactide Matrix Composite on the Mechanical and Thermomechanical Properties

Evaluation of the Oil-Rich Waste Fillers’ Influence on the Tribological Properties of Polylactide-Based Composites

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