Annealing induced electrical conductivity jump of multi-walled carbon nanotube/polypropylene composites and influence of molecular weight of polypropylene

2010 ◽  
Vol 48 (21) ◽  
pp. 2238-2247 ◽  
Author(s):  
Yongzheng Pan ◽  
Henry Kuo Feng Cheng ◽  
Lin Li ◽  
Siew Hwa Chan ◽  
Jianhong Zhao ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Molecular Weight ◽  
Carbon Nanotube ◽  
Polypropylene Composites ◽  
Multi Walled Carbon Nanotube ◽  
Conductivity Jump

Effects of Molecular Weight and Annealing on Electrical Conductivity of Multi-Walled Carbon Nanotube/Polypropylene Composites

2010 ◽  
Vol 447-448 ◽  
pp. 619-623
Author(s):  
Yong Zheng Pan ◽  
Lin Li ◽  
Siew Hwa Chan ◽  
Jian Hong Zhao
Keyword(s):  
Electrical Conductivity ◽  
Molecular Weight ◽  
Mixing Process ◽  
Melt Mixing ◽  
Subsequent Formation ◽  
Polypropylene Composites ◽  
Post Annealing ◽  
Multi Walled Carbon Nanotube ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

Composites of polypropylene (PP) and multi-walled carbon nanotubes (MWCNTs) were prepared by a micro melt mixing process. The molecular weight of PP was varied from 190,000 to 340,000 to examine its effects on the electrical conductivity. It has been discovered that a significant enhancement of electrical conductivity could be achieved by a thermal post annealing process above the melting temperature of PP. Factors such as annealing time, temperature, viscosity of PP, and content of MWCNTs all affected the enhancement of electrical conductivity. Re-aggregation of MWCNTs and the subsequent formation of MWCNT networks during annealing are considered to be the main reasons for the quick enhancement of electrical conductivity. The observed effect of molecular weight of PP on the enhancement of electrical conductivity suggested that the enhancement process could be controlled by diffusion of MWCNTs.

Experimental Research on the Conductive Property of MWCNT Nanopaper

2015 ◽  
Vol 727-728 ◽  
pp. 137-140
Author(s):  
A Ying Zhang
Keyword(s):  
Electrical Conductivity ◽  
Electrical Resistivity ◽  
Carbon Nanotube ◽  
Electrical Properties ◽  
The Self ◽  
Vacuum Deposition ◽  
Temperature Dependent ◽  
Polycarbonate Membrane ◽  
Multi Walled Carbon Nanotube ◽  
Conductive Property

This paper presents a systematic study of the nano-sized structure and temperature dependent electrical properties. A method of synthesizing the self-assembled multi-walled carbon nanotube (MWCNT) nanopaper on hydrophilic polycarbonate membrane was explored. The process is based on the very well-defined dispersion of nanotube and controlled pressure vacuum deposition procedure. The experiment results show that the ratio changes of MWCNT in the nanopaper could lead to the changes in the electrical conductivity efficiency of the nanopaper. Furthermore, the electrical resistivity of MWCNT nanopaper decreased as temperature increase.

Improved electrical conductivity of very long multi-walled carbon nanotube bundle/poly (methyl methacrylate) composites

Carbon ◽  
2011 ◽  
Vol 49 (6) ◽  
pp. 2127-2133 ◽  
Author(s):  
Jun Seop Kim ◽  
Shin Je Cho ◽  
Kwang Seok Jeong ◽  
Young Chul Choi ◽  
Mun Seok Jeong
Keyword(s):  
Electrical Conductivity ◽  
Carbon Nanotube ◽  
Methyl Methacrylate ◽  
Poly Methyl Methacrylate ◽  
Multi Walled Carbon Nanotube ◽  
Nanotube Bundle
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