Carbon Nanotube Dispersion

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Carbon nanotube

This content is based on the presentation of Yajima laboratry of TUS 

at the 38th Fullerene Nanotube Symposium on 2010.3.2-4


MWNT / SBR composite film prepared by Banbury type mixer MWNT/SBR composite film prepared by Banbury type mixer.
The grayish and uneven color on the serface shows CNTs are not well dispersed.
MWNT/SBR composite film prepared by THINKY MIXER ARE-310. MWNT/SBR composite film prepared by THINKY MIXER ARE-310.
The film displays jet-black color with glossy surface, as CNTs are well dispersed.
percolation_eng.jpg   

Comparison of THINKY MIXER ARE-310 with Banbury type internal mixer.


It has been reported that high concentrations of conductive materials such as carbon nanotube in non-conductive material (e.g.: rubber) forms a conductive path and changes the non-conductive material to conductive material 1). The minimum density value of conductive material that changes non-conductive to conductive is generally called the percolate threshold. It has been reported that a banbury mixer, that disperses conductive materials in non-conductive materials easily, shears carbon nanotube and increases the percolate threshold 2). THINKY's planetary centrifugal mixer can disperse carbon nanotube evenly, keeping a certain fiber length without shearing carbon nanotube, therefore, it has been reported that it can reduce the percolate threshold to 1/10 of the traditional value 3).


<References>

1) NICHIAS Technology Times NO.333 2002 No.5 The mechanism of the conductive composites generation based on percolation theory

2) Molding Vol.17 No.1 2005 Dispersion of carbon nanotube in polymer using twin screw extruders 2

3) 38th Fullerene Nanotubes General Symposium 2010 Electrical properties of carbon nanotube rubber composite produced using planetary centrifugal mixing technology

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