Improving post irradiation stability of high density polyethylene by multi walled carbon nanotubes

2012 ◽  
Vol 72 (3) ◽  
pp. 390-396 ◽  
Author(s):  
P.S. Rama Sreekanth ◽  
N. Naresh Kumar ◽  
S. Kanagaraj
Keyword(s):  
Carbon Nanotubes ◽  
High Density Polyethylene ◽  
High Density ◽  
Post Irradiation ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

scholarly journals Thermal and Structural Properties of High Density Polyethylene/Carbon Nanotube Nanocomposites: A Comparison Study

Chemosensors ◽  
2021 ◽  
Vol 9 (6) ◽  
pp. 136
Author(s):  
Ayat Bozeya ◽  
Yahia F. Makableh ◽  
Rund Abu-Zurayk ◽  
Aya Khalaf ◽  
Abeer Al Bawab
Keyword(s):  
Carbon Nanotubes ◽  
Polymer Matrix ◽  
High Density Polyethylene ◽  
High Density ◽  
Gravimetric Analysis ◽  
Scanning Calorimetry ◽  
Melt Compounding ◽  
Multi Walled Carbon Nanotubes ◽  
Functionalization Of Carbon Nanotubes ◽  
Walled Carbon Nanotubes

The effects of functionalization of carbon nanotubes on the properties of nanocomposite sheets prepared from high-density polyethylene (HDPE) and carbon nanotubes (CNTs) were investigated. Carbon nanotubes were first oxidized, followed by amine group functionalization. The Fourier transform-infrared (FTIR) spectroscopy results confirm the presence of oxygenated and amide groups at the surface of the CNTs after each treatment. The HDPE/CNT nanocomposites sheets were prepared using a melt compounding method. Six types of CNTs were used; pristine Single-walled Carbon nanotubes (SWCNT) and pristine Multi-walled Carbon nanotubes (MWCNT), oxidized (O-SWCNT and O-MWCNT) and amide (Amide-SWCNT and Amide-MWCNT). All prepared nanocomposite sheets were characterized using Thermal gravimetric analysis (TGA), Differential scanning calorimetry (DSC), X-ray diffraction (XRD) and scanning electronic microscope (SEM). TGA results measured increased thermal stability of the polymer with the addition of CNTs, O-MWCNT showed the best enhancement. XRD measurements confirmed that the addition of CNTs did not change the crystal structure of the polymer, although the crystallinity was decreased. The maximum crystallinity decrease resulted from O-SWNTs addition to the polymer matrix. SEM imaging showed that oxidized and functionalized CNTs have more even dispersion in the polymer matrix compared with pristine CNTs.

Preparation of multi-walled carbon nanotubes/high density polyethylene composites with enhanced properties by using a master batch method

2021 ◽  
pp. 096739112110178
Author(s):  
Fu-An He ◽  
Li-Ming Zhang
Keyword(s):  
Carbon Nanotubes ◽  
High Density Polyethylene ◽  
In Situ Polymerization ◽  
Flexural Modulus ◽  
High Density ◽  
Homogeneous Distribution ◽  
Blending Method ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

Multi-walled carbon nanotubes (MWCNTs)/high density polyethylene (HDPE) composites were prepared by a masterbatch method (mPEC) in which a commercial HDPE was blended with a MWCNTs/HDPE masterbatch obtained from in situ polymerization. Owing to the interfacial interaction, a 13 cm−1 up-shift of the G band for the MWCNTs was observed in the Raman spectrum of the MWCNTs/HDPE masterbatch and the homogeneous distribution of MWCNTs in the mPEC was realized. Compared to the pure HDPE and the MWCNTs/HDPE composites prepared by a direct melt-blending method (dPEC), the mPEC had better electrical, mechanical and rheological properties, suggesting that the in situ polymerized HDPE covering on the MWCNTs surfaces played an important role in the reinforcing effects as an interfacial modifier. The tensile yield strength and the Young’s modulus of the mPEC containing 3 wt% MWCNTs (mPEC3), and the flexural strength and the flexural modulus of the mPEC containing 1 wt% MWCNTs were improved by 38.3%, 41.7%, 24.4%, and 42.9%, respectively, compared to those of the pure HDPE. For, the electrical resistivity of mPEC3 was decreased by about three orders of magnitude relative to that of the pure HDPE. The | η*|, G′, and G″ of the mPEC were obviously higher than those of pure HDPE. Moreover, the polyethylene-modified MWCNTs obtained from in situ polymerization could facilitate the crystallization of the HDPE macromolecular chains more effectively compared to the unmodified MWCNTs.

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