scholarly journals Morphology and Mechanical Properties of Low Density Polyethylene/Multi-walled Carbon Nanotubes Nanocomposites

2017 ◽  
Vol 23 (2) ◽  
Author(s):  
Fang HUANG ◽  
Lin-jian SHANGGUAN
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotubes ◽  
Low Density Polyethylene ◽  
Low Density ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes ◽  
Morphology And Mechanical Properties

scholarly journals Enhanced Functional Properties of Low-Density Polyethylene Nanocomposites Containing Hybrid Fillers of Multi-Walled Carbon Nanotubes and Nano Carbon Black

Polymers ◽  
2020 ◽  
Vol 12 (6) ◽  
pp. 1356 ◽  
Author(s):  
Sandra Paszkiewicz ◽  
Anna Szymczyk ◽  
Agata Zubkiewicz ◽  
Jan Subocz ◽  
Rafal Stanik ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Carbon Nanotubes ◽  
Synergistic Effects ◽  
Hybrid Nanocomposites ◽  
Low Density Polyethylene ◽  
Low Density ◽  
Multi Walled Carbon Nanotubes ◽  
Nano Carbon ◽  
Carbon Nanofillers ◽  
Walled Carbon Nanotubes

In this work, hybrid filler systems consisting of multi-walled carbon nanotubes (MWCNTs) and nano carbon black (nCB) were incorporated by melt mixing in low-density polyethylene (LDPE). To hybrid systems a mixture of MWCNTs and nCB a mass ratio of 1:1 and 3:1 were used. The purpose was to study if the synergistic effects can be achieved on tensile strength and electrical and thermal conductivity. The dispersion state of carbon nanofillers in the LDPE matrix has been evaluated with scanning electron microscopy. The melting and crystallization behavior of all nanocomposites was not significantly influenced by the nanofillers. It was found that the embedding of both types of carbon nanofillers into the LDPE matrix caused an increase in the value of Young’s modulus. The results of electrical and thermal conductivity were compared to LDPE nanocomposites containing only nCB or only MWCNTs presented in earlier work LDPE/MWCNTs. It was no synergistic effects of nCB in multi-walled CNTs and nCB hybrid nanocomposites regarding mechanical properties, electrical and thermal conductivity, and MWCNTs dispersion. Since LDPE/MWCNTs nanocomposites exhibit higher electrical conductivity than LDPE/MWCNTs + nCB or LDPE/nCB nanocomposites at the same nanofiller loading (wt.%), it confirms our earlier study that MWCNTs are a more efficient conductive nanofiller. The presence of MWCNTs and their concentration in hybrid nanocomposites was mainly responsible for the improvement of their thermal conductivity.

scholarly journals Fabrication and characterisation of low density polyethylene (LDPE)/multi walled carbon nanotubes (MWCNTs) nano-composites

2016 ◽  
Vol 8 ◽  
pp. 403-405 ◽  
Author(s):  
Meenakshi Goyal ◽  
Nikhil Goyal ◽  
Harleen Kaur ◽  
Ashmeet Gera ◽  
Kriti Minocha ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Low Density Polyethylene ◽  
Nano Composites ◽  
Low Density ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

Effect of Uniaxial Deformation, Annealing and Carbon Nanotubes on the Morphology and Mechanical Properties of Poly (Butylene Terephthalate) and PBT Nanocomposites

2007 ◽  
Author(s):  
Gaurav Mago ◽  
Jerry A. Dutreuil ◽  
Frank T. Fisher ◽  
Dilhan M. Kalyon
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotubes ◽  
Crystal Morphology ◽  
Polarized Light ◽  
Uniaxial Deformation ◽  
Multi Walled Carbon Nanotubes ◽  
Strain Induced Crystallization ◽  
Walled Carbon Nanotubes ◽  
Induced Crystallization ◽  
Morphology And Mechanical Properties

The goal of this investigation is to elucidate the interrelations between the strain-induced crystallization behavior, morphology and mechanical properties of poly (butylene terephthalate) PBT and its nanocomposites with multi-walled carbon nanotubes (MWNTs). The mechanical properties of semicrystalline polymers such as PBT depend upon the processing conditions, which affect the crystallization behavior and the resulting crystal morphology developed within the processed sample. PBT is observed to undergo strain-induced crystallization during uniaxial deformation, with concomitant changes in the polymer crystal as a function of the applied strain history. In the current work polymer morphology was investigated with wide angle XRD, differential scanning calorimetry (DSC) and polarized light microscopy (PLM). DSC results indicate an increase in crystallinity due to strain-induced crystallization during uniaxial cold-stretching, which was further confirmed with XRD analysis of the samples. Analyses of the samples under polarized light pre- and post-stretching clearly show that there is a transformation of the spherulitic crystals of the pre-stretch morphology into elongated oblong crystals, as the imposed strain exceeds a critical value. Annealing of PBT was done under different conditions to probe the effects of changes in the crystallinity obtained upon thermal treatment on polymer morphology and mechanical properties. The annealed samples were found to have high crystallinity, high Young’s modulus, and low yield stress values as compared to unannealed samples processed under similar conditions. To investigate the effects of nanoparticle loadings on PBT crystal morphology and mechanical properties, pure PBT was melt mixed with different concentrations of multi-walled carbon nanotubes (MWNTs). Due to the increased nucleation rate effect associated with the incorporation of MWNTs, the PBT crystallization temperature was increased and the crystal size decreased with the increasing concentration of MWNTs. Tensile tests performed on PBT and their nanocomposite samples revealed decreases in the elongation at break values. Research is ongoing to understand the relationship between the MWNT loading levels and mechanical properties along with study of orientation of MWNTs under tensile load and its effect on strain-induced crystallization.

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