Thermal Annealing Induced Enhancements of Electrical Conductivities and Mechanism for Multiwalled Carbon Nanotubes Filled Poly(Ethylene-co-Hexene) Composites

2012 ◽  
Vol 4 (12) ◽  
pp. 6468-6478 ◽  
Author(s):  
Wenlin Li ◽  
Yaqiong Zhang ◽  
Jingjing Yang ◽  
Jun Zhang ◽  
Yanhua Niu ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Multiwalled Carbon Nanotubes ◽  
Thermal Annealing ◽  
Multiwalled Carbon ◽  
Electrical Conductivities ◽  
Poly Ethylene

Surface Modification of Multiwalled Carbon Nanotubes with Engineered Self-Assembled RAFT Diblock Coatings

2014 ◽  
Vol 67 (1) ◽  
pp. 151 ◽  
Author(s):  
Yue Liu ◽  
Xiaojuan Hao ◽  
Lynne J. Waddington ◽  
Jieshan Qiu ◽  
Timothy C. Hughes
Keyword(s):  
Carbon Nanotubes ◽  
Multiwalled Carbon Nanotubes ◽  
Electrostatic Interactions ◽  
Diblock Copolymers ◽  
Raft Polymerization ◽  
Dispersion Stability ◽  
Multiwalled Carbon ◽  
Molecular Weights ◽  
Poly Ethylene ◽  
Positively Charged

A facile method to modify the surface of multiwalled carbon nanotubes (MWCNTs) via electrostatic interactions between polyelectrolytes and oxidized MWCNTs was developed. Diblock copolymers containing poly[2-(methacryloyloxy)ethyltrimethylammonium chloride] (PMETAC), a positively charged block, and poly(ethylene glycol) methacrylate (PEGMA), a neutral block, with tailored molecular weights and low polydispersities were synthesized by reversible addition–fragmentation chain transfer (RAFT) polymerization. Acid treated-MWCNTs were coated with the RAFT diblock copolymers to improve their dispersibility in aqueous phosphate buffered saline (PBS) solution. The short positively charged PMETAC block was designed to attach the block copolymers to the surface of MWCNTs via electrostatic interactions, whereas the PEGMA block improved dispersibility of the MWCNTs in aqueous solutions. Extensive screening of the diblock copolymers with different degrees of polymerization (DP) showed that the dispersion stability of the polymer-coated MWCNTs in PBS was greatly improved with increasing chain length of the PEGMA block. In particular, the MWCNTs coated with a diblock copolymer containing PEGMA (DP = 118, the longest block investigated) showed superior dispersion stability in both water and PBS solution.

Externally limited defect generation in multiwalled carbon nanotubes upon thermal annealing, and possible mechanism

2016 ◽  
Vol 27 (35) ◽  
pp. 355706 ◽  
Author(s):  
G M Bhalerao ◽  
A K Sinha ◽  
A K Srivastava ◽  
V Sathe ◽  
G Amarendra
Keyword(s):  
Carbon Nanotubes ◽  
Multiwalled Carbon Nanotubes ◽  
Thermal Annealing ◽  
Multiwalled Carbon ◽  
Defect Generation

High yield purification of multiwalled carbon nanotubes by selective oxidation during thermal annealing

Carbon ◽  
2001 ◽  
Vol 39 (5) ◽  
pp. 655-661 ◽  
Author(s):  
Young Soo Park ◽  
Young Chul Choi ◽  
Keun Soo Kim ◽  
Dong-Chul Chung ◽  
Dong Jae Bae ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Multiwalled Carbon Nanotubes ◽  
Selective Oxidation ◽  
Thermal Annealing ◽  
High Yield ◽  
Multiwalled Carbon
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