Polypropylene/carbon nanotube magnetic composites obtained using carbon nanotubes from sawdust

Nisar, Muhammad; Bernd, Maria da Graça Sebag; Filho, Luiz Carlos Pinto da Silva; Geshev, J.

doi:10.1002/pat.4493

Cited by 7 publications

(6 citation statements)

References 52 publications

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“…The reason for this may be the flexible effect of the PE introduced to the PLA, resulting in a slight improvement in the plasticity [ 27 ]. However, the deterioration of the tensile strength of this material may be caused by a large difference in polarization between PLA and PE polymers, leading to their poor adhesion [ 28 ]. These suggestions were confirmed by SEM observations of the fracture surface of the samples discussed later in this article.…”

Section: Resultsmentioning

confidence: 99%

“…This indicates decomposition of the PLA after mixing with powders resulted in rupture polymer chains, that cannot be trapped by the metals particles, decreasing the thermal stability. It is expected, on the basis of the literature data [ 26 , 28 ] that metal powder nanoparticles can effectively trapped free radicals and thus increase the thermal stability of the composites. The decrease in T 5% and T 95% temperatures in the samples after the degradation period indicates a mechanism of chain breakage and the formation of shorter and lighter fractions, which are characterized by a lower temperature of onset and end of decomposition [ 30 , 37 , 38 ].…”

Section: Resultsmentioning

confidence: 99%

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Mechanical and Thermal Properties of Polylactide (PLA) Composites Modified with Mg, Fe, and Polyethylene (PE) Additives

et al. 2020

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In this article, polylactic acid-based composites reinforced with 5% of polyethylene, iron, and magnesium powders were prepared by extrusion and compressed under the pressure of about 10 MPa and characterized. These composites were mechanically, thermally, and morphologically evaluated. It was found, compared to the pure polylactic acid (PLA), an improvement in tensile strength (both σ and YS0.2) was obtained for the composite with the iron powder addition, while the magnesium powder slightly improved the ductility of the composite material (from 2.0 to 2.5%). Degradation studies of these composites in the 0.9% saline solution over a period of 180 days revealed changes in the pH of the solution from acidic to alkaline, in all samples. The most varied mass loss was observed in the case of the PLA-5%Mg sample, where initially the sample mass increased (first 30 days) then decreased, and after 120 days, the mass increased again. In the context of degradation phenomenon of the tested materials, it turns out that the most stable is the PLA composite with the Fe addition (PLA-5%Fe), with highest tensile strength and hardness.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Mechanical and Thermal Properties of Polylactide (PLA) Composites Modified with Mg, Fe, and Polyethylene (PE) Additives

et al. 2020

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“…The crystallization is presented at 114.4°C for the control group and 122.8°C for the experimental group with 3 wt% of CNT. To sum up, the addition of CNT gives rise to heterogeneous nucleation that effectuates efficient crystallization and expedites crystallization rate 42,43 …”

Section: Resultsmentioning

confidence: 99%

Carbon nanotube/polypropylene/polycarbonate conductive nanocomposite films: Preparation and characterization

Zhang

Wang

et al. 2021

J of Applied Polymer Sci

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In this study, CNT/PP/PC conductive composite films were prepared by compounding PP (polypropylene)/PC (polycarbonate) (1:1) and carbon nanotubes (CNT) using a physical blending and hot pressing method. Next, Fourier transform infrared spectroscopy, thermogravimetric analysis, differential scanning calorimetry, and water contact angle measurement are conducted in order to characterize the properties of CNT/PP/PC conductive films. The results showed there is no chemical reaction inside the PP/PC composite film with the addition of CNT. Neither the CNT composite film containing 3 wt% nor the control film decomposed thermally within 220°C. The water contact angle increased from 88.5° for the control film to 110.99° for the composite film containing 3 wt% CNT. This indicates that the film has good thermal stability and hydrophobic properties. The percolation threshold was obtained when the content of CNT was 3 wt%, and the best conductivity of the CNT/PP/PC composite film was 5.53 S/m at this time. In order to improve the tensile properties of the film, a small amount of polyurethane (TPU) was added to the film, and the maximum tensile strength was 24.91 Mpa when the content of TPU was 6.7%. This study can provide a strategy for the practical application of flexible electronic devices.

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“…This is attributed to the filler strongly limiting the effort of the polymer chains, stopping them from elongating when they are beneath tension. [42]…”

Section: Mechanical Propertiesmentioning

confidence: 99%

Metal activated carbon as an efficient filler for high‐density polyethylene nanocomposites

et al. 2020

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interesting properties of magnetic nanocomposites have attracted attention of both academic and industrial researchers. In this work, thermal, mechanical, morphological, and magnetic properties of polyethylene (PE) nanocomposites were inspected using carbon-based magnetic fillers (C Ni, C Co, and C Fe).The melt mixing method was employed to prepare the nanocomposites using small amounts of filler ranging up to 2 wt%. Wood sawdust pyrolysis produces carbonized material activated by Ni, Co, or Fe salts and used as filler. The structural analysis was carried out using Fourier transform infrared spectroscopy indicating that the polymer chemical structure remains unaltered with the filler addition. Thermal stability of nanocomposites as well as the determination of metal amount in the carbon-based fillers was investigated by thermogravimetric analysis. Filler introduction enhanced the onset and the maximum degradation temperatures up to 11 C and 8 C, respectively. The crystallization and melting temperatures examined by differential scanning calorimetry remained unchanged as compared to neat PE whereas the percent crystallinity was improved up to 8%. The incorporation of the filler leads to the improvement in the elastic modulus of the polymer matrix. The addition of 2.0 wt% of the metal-carbonized filler in the diamagnetic polymer resulted in a thermoplastic nanocomposite with ferromagnetic behavior.

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Polypropylene/carbon nanotube magnetic composites obtained using carbon nanotubes from sawdust

Cited by 7 publications

References 52 publications

Mechanical and Thermal Properties of Polylactide (PLA) Composites Modified with Mg, Fe, and Polyethylene (PE) Additives

Mechanical and Thermal Properties of Polylactide (PLA) Composites Modified with Mg, Fe, and Polyethylene (PE) Additives

Carbon nanotube/polypropylene/polycarbonate conductive nanocomposite films: Preparation and characterization

Metal activated carbon as an efficient filler for high‐density polyethylene nanocomposites

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