scholarly journals Surface Chemical Modification of Multiwalled Carbon Nanotubes by a Wet-Mechanochemical Reaction

2008 ◽  
Vol 2008 ◽  
pp. 1-5 ◽  
Author(s):  
Lifei Chen ◽  
Huaqing Xie ◽  
Yang Li ◽  
Wei Yu
Keyword(s):  
Carbon Nanotubes ◽  
Multiwalled Carbon Nanotubes ◽  
Domain Size ◽  
Mechanochemical Reaction ◽  
Hydroxyl Groups ◽  
Polar Solvents ◽  
Multiwalled Carbon ◽  
Functionalized Surfaces ◽  
Alcohol Solvent ◽  
Surface Chemical Modification

A wet-mechanochemical reaction for surface modification of multiwalled carbon nanotubes (CNTs) has been developed. In the treatment, CNTs reacted with potassium hydroxide in alcohol solvent at room temperature under mechanical milling. The results from Fourier transmission infrared spectroscopy demonstrate that the nonreactive surfaces of CNTs have been modified successfully by multiple hydroxyl groups. Functionalized carbon nanotubes exhibit higher zeta potential values indicating their high dispersibility in polar solvents. XRD studies corroborate that the surface functionalization does not affect the basic crystal domain size of CNTs. TEM observations reveal that CNTs have been cut into shorter ones by the milling. Shortened CNTs with functionalized surfaces show good dispersion properties.

scholarly journals Preparation, Characterization, and Properties of Polyurethane-Grafted Multiwalled Carbon Nanotubes and Derived Polyurethane Nanocomposites

2011 ◽  
Vol 2011 ◽  
pp. 1-9 ◽  
Author(s):  
Tzong-Liu Wang ◽  
Chin-Chung Yu ◽  
Chien-Hsin Yang ◽  
Yeong-Tarng Shieh ◽  
Yu-Zen Tsai ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Multiwalled Carbon Nanotubes ◽  
Photoelectron Spectroscopy ◽  
Acid Treatment ◽  
Treatment Time ◽  
Nanocomposite Films ◽  
Esterification Reaction ◽  
Hydroxyl Groups ◽  
Multiwalled Carbon ◽  
Xps Spectra

We incorporated hydroxyl groups into the polyurethane backbone and then used the “grafting to” approach to functionalize the multiwalled carbon nanotubes (MWNTs) via the esterification reaction between MWNTs and segmented polyurethanes (PUs). X-ray photoelectron spectroscopy (XPS) spectra showed that the sidewalls of MWNTs had been functionalized with acid treatment, and the amount of COOH increased with increasing acid treatment time. FTIR spectra further confirmed that PU was covalently attached to the sidewalls of MWNTs. The functionalized acid amount and the grafted PU amount were determined by thermogravimetric analyses (TGAs). Comparative studies based on SEM images of the PU-functionalized and chemically defunctionalized MWNT samples also revealed the covalent coating character. Dynamic mechanical analysis (DMA) of nanocomposite films prepared from PU and PU-functionalized MWNTs showed enhanced mechanical properties and increased soft segment . Tensile properties indicated that PU-functionalized MWNTs were effective reinforcing fillers for the polyurethane matrix.

Preparation and Characterization of Poly(ε-Caprolactone)-Grafted-Multiwalled Carbon Nanotubes

2007 ◽  
Vol 334-335 ◽  
pp. 873-876
Author(s):  
Hun Sik Kim ◽  
Yun Seok Chae ◽  
Hyoung Joon Jin ◽  
Jin San Yoon
Keyword(s):  
Carbon Nanotubes ◽  
Multiwalled Carbon Nanotubes ◽  
Ring Opening ◽  
Hydroxyl Groups ◽  
Multiwalled Carbon ◽  
Solvent Cast ◽  
Before And After ◽  
Nanotube Composites ◽  
Carbon Nanotube Composites

Sheets of poly(ε-caprolactone) (PCL)/carbon nanotube composites were prepared through the solvent cast method. Multiwalled carbon nanotubes (MWCNT) functionalized with hydroxyl groups were used as an initiator for the ring opening polymerization of ε-caprolactone to introduce PCL chains to the surface of MWCNT in order to ameliorate the dispersion of MWCNT in PCL matrix. Grafting of PCL chains to MWCNT was followed by FTIR and TEM observations. Effect of the incorporation of MWCNT on the mechanical properties of PCL was explored before and after the modification of the MWCNT by the PCL grafting.

Effect of Multiwalled Carbon Nanotubes On Mechanical Properties of Concrete

2012 ◽  
Vol 2 (6) ◽  
pp. 166-168 ◽  
Author(s):  
Dr.T.Ch.Madhavi Dr.T.Ch.Madhavi ◽  
◽  
Pavithra.P Pavithra.P ◽  
Sushmita Baban Singh Sushmita Baban Singh ◽  
S.B.Vamsi Raj S.B.Vamsi Raj ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotubes ◽  
Multiwalled Carbon Nanotubes ◽  
Multiwalled Carbon
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