Third Day Poster Session, 17 June 2010 - NanoTR-VI

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Poster Session, Thursday, June 17
Theme F686 - N1123
0BTemperature Dependent Electrical Conductivity of Ardel D-100 / MWCNT Nanocomposite
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2
1
Murat ÇalkanP P, Dolunay akarP
UMerih SerinUP P*
1
PDepartment of Physics, Yildiz Technical University, stanbul 34210, Turkey
2
PDepartment of Chemistry, Yildiz Technical University, Istanbul 34210, Turkey
TAbstractT-In this work, ARDEL D-100/MWCNT (1.5 wt%) nanocomposite was studied. The characterization of the electrical properties of
prepared nanocomposite with respect to the temperature were studied. Direct-current measurements with a continuously changing temperature
of sample were presented. The resistivity of the ARDEL D-100 was decreased by 10 order of magnitude on
addition of 1.5wt%of MWCNT.
Multiwalled carbon nanotubes (MWCNTs) are
considered to be the ideal reinforcing agent for
high-strength polymer composites, because of their
fantastic mechanical strength, high electrical and thermal
conductivity and high aspect ratio [1].
ARDEL D-100 which is high engineering thermoplastic
and an amorphous aromatic polyester of bisphenol-A with
terephthalic and isophthalic acid (50/50) was studied. It has
high heat-deflection temperature, high impact strength and
good electrical properties [2].
Our aim was to obtain an insight of the mechanism of the
conductivity of ARDEL D-l00/MWCNT nanocomposite
and to determine the characteristic glass transition
temperature, Tg, of the sample. For this purpose, the
characterization of the electrical properties of prepared
nanocomposite with respect to the temperature were
studied. Direct-current measurements with a continuously
changing temperature of sample were presented.
ARDEL D-100/MWCNT (1.5 wt%) nanocomposite was
prepared by melt mixing at 300 °C, 50 rpm in 5 min. This
was carried out in the Leibniz Institute of Polymer Research
Dresden. The film of melt compounded ARDEL D – 100 /
MWCNT (1.5wt%) nanocomposite was prepared via
solvent casting method on glass substrate.
The volume resistivity of melt mixing sample was
determined by measuring the DC resistance on the pressed
plates. The measurement was performed on strips cut from
the pressed sheets using a four-point text fixture combined
with a Keithley DMM 2000 electrometer. Prior to the
measurement, the surface of the sample was cleaned with
ethanol. This was carried out in The Leibniz Institute of
Polymer Research Dresden.
For the electrical characterization, dark conductivity of
produced films were measured as a function of temperature
using a Janis liquid nitrogen vacuum cryostat, having a
thermocouple in good thermal contact with the sample.
Samples were placed on top of a copper plate that is heated
by a bolt heater embedded within.
Temperature was controlled by Lakeshore Temperature
Controller 331. Dark conductivity measurements were
accomplished using a programmable Keitley 6517A digital
electrometer/voltage source interfaced to a computer.
The temperature dependence of conductivity was
measured as the temperature being increased at a constant
-1
rate of 3K minP
P. The film thickness was determined
from the area formed by spreading polymer solution with
known volume and concentration.
The change in the conductivity of the sample was
experimentally measured under a constant electrical field.
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The measurements were carried out in l0P
PTorr vacuum and
the dark. The electrical conductivity of the polymer was
measured in AI/ARDEL D-100/MWCNT/A1 structure
over the temperature range of 300-520K.
The volume resistivity of pure ARDEL D-100 was
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measured as 1.54x10P The volume and specific
resistivity of the nanocomposite sample was measured as
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5
3.5lxl0P P(.cm) and 8.56 xl0P P(.cm), respectively, at room
temperature.
In summary, we showed that the resistivity of the ARDEL
D-100 was decreased (conductivity increased) by ten orders
of magnitude on addition of 1.5wt% MWCNT.
The electrical conductivity values of ARDEL D-100/
MWCNT with increasing temperature, which would be
useful for a wide range of applications, were achieved. This
nanocomposite film showed semiconductor behavior with
the exponential variation of inverse temperature
dependence of electrical conductivity. Therefore, it is
possible to explain the conduction mechanism of the
nanocomposite by using existing solid state theory.
This work was partially supported by the Leibniz Institute
of Polymer Research Dresden, and by Yildiz Technical
University, Scientific Research Project Coordination, under
Grant No. BAPK-2001-01-01-01 and
BAPK-2007-01-01-07.
*Corresponding author: serin@vildiz.edu.tr
[1] EW. Wong, PE. Sheehan, CM. Lieber. Science, 277:1971–5,
(1997).
[2] D. Sakar, O. Cankurtaran and F. Karaman, Journal of
Applied Polymer Science, 98(6): 2365-2368 (2005).
6th Nanoscience and Nanotechnology Conference, zmir, 2010 746