scholarly journals Effects of Graphene Nanoplatelets and Multiwall Carbon Nanotubes on the Structure and Mechanical Properties of Poly(lactic acid) Composites: A Comparative Study

2019 ◽  
Vol 9 (3) ◽  
pp. 469 ◽  
Author(s):  
Todor Batakliev ◽  
Ivanka Petrova-Doycheva ◽  
Verislav Angelov ◽  
Vladimir Georgiev ◽  
Evgeni Ivanov ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotubes ◽  
Lactic Acid ◽  
Low Cost ◽  
Multiwall Carbon Nanotubes ◽  
Poly Lactic Acid ◽  
Carbon Filler ◽  
Multi Walled Carbon Nanotubes ◽  
Carbon Fillers ◽  
Walled Carbon Nanotubes

Poly(lactic acid)/graphene and poly(lactic acid)/carbon nanotube nanocomposites were prepared by an easy and low-cost method of melt blending of preliminary grinded poly(lactic acid) (PLA) with nanosized carbon fillers used as powder. Morphological, structural and mechanical properties were investigated to reveal the influence of carbon nanofiller on the PLA–based composite. The dependence of tensile strength on nanocomposite loading was defined by a series of experiments over extruded filaments using a universal mechanical testing instrument. The applying the XRD technique disclosed that compounds crystallinity significantly changed upon addition of multi walled carbon nanotubes. We demonstrated that Raman spectroscopy can be used as a quick and unambiguous method to determine the homogeneity of the nanocomposites in terms of carbon filler dispersion in a polymer matrix.

The effect of nanoparticles shape on the mechanical properties of poly lactic acid matrix

2021 ◽  
pp. 009524432098816
Author(s):  
Sajjad Daneshpayeh ◽  
Faramarz Ashenai Ghasemi ◽  
Ismail Ghasemi
Keyword(s):  
Mechanical Properties ◽  
Lactic Acid ◽  
Impact Strength ◽  
Tensile Tests ◽  
Poly Lactic Acid ◽  
The Matrix ◽  
Multi Walled Carbon Nanotubes ◽  
Four Levels ◽  
Carbon Fillers ◽  
Walled Carbon Nanotubes

In this research, mechanical properties of poly lactic acid (PLA)-based nanocomposites were investigated. The nanocomposites were fabricated by adding of three types of nano-materials including multi-walled carbon nanotubes (MWCNT), carbon black (CB) nanoparticles and graphene nano-platelets (GnPs) in four levels from 0 to 3 wt.% to PLA matrix by an internal mixer. Tensile and impact tests were performed to obtain the mechanical properties of nanocomposites. Moreover, field-emission scanning electron microscopy (FESEM) was used to observe the state of nano-fillers dispersion. The FESEM images showed that CB nanoparticles and MWCNT are well distributed in the matrix, but that GnPs are agglomerated. The results of the tensile tests showed that the addition of MWCNT and CB nanoparticles increased the tensile strength by 36% and 76% and the elastic modulus by 10% and 68%, respectively. Also, the presence of all three types of carbon fillers at low loading increased the elongation at break of PLA matrix, and this increase was more significant for GnPs by 55% in the 1 wt.% loading. Finally, the PLA polymer become more brittle with the addition of nanotubes and nano-platelets, and its impact strength was reduced. While, the CB nanoparticles increased the absorbing energy and impact strength.

Reinforcing Effects of Poly(D-Lactide)-g-Multiwall Carbon Nanotubes on Polylactide Nanocomposites

2015 ◽  
Vol 15 (10) ◽  
pp. 8086-8092 ◽  
Author(s):  
Jeong Hee Yang ◽  
Jae Yun Lee ◽  
In-Joo Chin
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Carbon Nanotubes ◽  
Testing Machine ◽  
Multiwall Carbon Nanotubes ◽  
Hydroxyl Groups ◽  
Scanning Calorimetry ◽  
Transmission Electron ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

Polylactide (PLA) nanocomposites with multi-walled carbon nanotubes (MWNTs) grafted with poly(L-lactide) or poly(D-lactide) were prepared by solution casting, and their thermal and mechanical properties were evaluated. MWNTs containing hydroxyl groups were treated by ring-opening polymerization of either L-lactide or D-lactide. Fourier transform infrared spectroscopy confirmed that the MWNT surfaces had been modified by the PLLA or PDLA chains. The thermal properties were measured by differential scanning calorimetry and thermogravimetric analysis. The mechanical properties were examined using a universal testing machine. The morphology of the fractured surfaces of the PLA nanocomposites was observed by scanning electron microscopy and transmission electron microscopy. PDLA-g-MWNTs were dispersed more uniformly compared to PLLA-g-MWNTs in the PLA matrix. The incorporation of PDLA-g-MWNTs greatly improved the tensile strength of the nanocomposites regardless of the contents. Thermal analysis revealed different characteristics at specific composites depending on the type of modification.

Development, optimization, and characterization of electrospun poly(lactic acid) nanofibers containing multi-walled carbon nanotubes

2007 ◽  
Vol 105 (3) ◽  
pp. 1668-1678 ◽  
Author(s):  
Seth D. McCullen ◽  
Kelly L. Stano ◽  
Derrick R. Stevens ◽  
Wesley A. Roberts ◽  
Nancy A. Monteiro-Riviere ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Lactic Acid ◽  
Poly Lactic Acid ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

Influence of twin-screw extrusion conditions on the dispersion of multi-walled carbon nanotubes in a poly(lactic acid) matrix

Polymer ◽  
2008 ◽  
Vol 49 (16) ◽  
pp. 3500-3509 ◽  
Author(s):  
Tobias Villmow ◽  
Petra Pötschke ◽  
Sven Pegel ◽  
Liane Häussler ◽  
Bernd Kretzschmar
Keyword(s):  
Carbon Nanotubes ◽  
Lactic Acid ◽  
Poly Lactic Acid ◽  
Twin Screw Extrusion ◽  
Screw Extrusion ◽  
Twin Screw ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

scholarly journals Biodegradable Poly (lactic acid)/Poly (ethylene glycol) Reinforced Multi-Walled Carbon Nanotube Nanocomposite Fabrication, Characterization, Properties, and Applications

Polymers ◽  
2020 ◽  
Vol 12 (2) ◽  
pp. 427 ◽  
Author(s):  
Ahmad Fahad Ahmad ◽  
Sidek Ab Aziz ◽  
Suzan Jabbar Obaiys ◽  
Mohd Hafiz Mohd Zaid ◽  
Khamirul Amin Matori ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Lactic Acid ◽  
Dielectric Properties ◽  
Electromagnetic Interference ◽  
Poly Lactic Acid ◽  
Shielding Effectiveness ◽  
Poly Ethylene Glycol ◽  
Multi Walled Carbon Nanotubes ◽  
Poly Ethylene ◽  
Walled Carbon Nanotubes

This paper presents the electromagnetic interference properties of multi-walled carbon nanotubes (MWCNTs) as a novel nano-reinforcement filler in poly (lactic acid) (PLA)/poly (ethylene glycol) (PEG) polymer matrix that was prepared via melt blending mode. Plasticization of PLA was first carried out by PEG, which overcomes its brittleness problem, in order to enhance its flexibility. A waveguide adapter technique was used to measure the dielectric properties ε r , and S-parameters reflection (S11) and transmission (S21) coefficients. The dielectric properties, microwave attenuation performances, and electromagnetic interference shielding effectiveness (EMISE) for all the material under test have been calculated over the full X-Band (8–12 GHz) due to its importance for military and commercial applications. The prepared samples were studied while using X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), Fourier transforms infrared spectroscopy (FTIR), mechanical properties measurements, as well as thermogravimetric analysis (TGA). The results showed that the dielectric properties increased with increased multi-walled carbon nanotubes (MWCNTs) filler, as well as the shielding effectiveness of the MWCNT/PLA/PEG nanocomposites increased with the increasing of MWCNTs. The highest SE total value was found to be 42.07 dB at 12 GHz for 4 wt.% filler content. It is also observed that the attenuation values of the nanocomposites increased with an increase in MWCNTs loading, as well as the power loss values for all of the samples increased with the increase in MWCNTs loading, except the amount of the transmitted wave through the nanocomposites.

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