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Accm-7 the 7th asian-australasian conference on composite materials november 15-18, 2010
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Effect of the Compatibilizer in the Multiwall Carbon Nanotube /
Super-toughened Polyethylene Terephthalate Nanocomposites
Chen-Feng Kuan1, Kun-Chang Lin2 , Hsu-Chiang Kuan3*
Department of Computer Application Engineering, Far East University 744, Tainan county, Taiwan
Department of Materials Science and Engineering, Far East University 744, Tainan county, Taiwan
3 Department of Energy Application Engineering, Far East University 744, Tainan county, Taiwan
Corresponding authorΚNo.49, Chung Hua Rd., Hsin-Shih. Tainan County 744, Taiwan, R.O.C.
process on the mechanical properties and thermal
A new modification approach was proposed to
properties of the CNT / PET composite. A novel reacton
prepare the multiwall carbon nanotube (MWNT) /
mechanism was proposed for this research.
polyethylene terephthalate (PET) nanocomposites. A
Vinyltriethoxysilane and benzoyl peroxide were utilized
modified MWNT was chemically reacted with the
to modify the surface of carbon nanotube by a free
tougher, polyolefin grafted maleic anhydride. The
radical reaction. Comparing to functionalize CNT by
physical properties of these MWNT / PET resin
acid treatment, covalently functionalized CNT by the
nanocomposite were studied. From the results, adding
addition of free radicals is particularly useful for
MWNT can improve the tensile strength and Impact
large-scale synthesis and provides functional groups for
strength as the MWNT content was increased; In thermal
properties of nanocomposites, the temperatures of
maximum weight loss of PET and 3wt% MWNT / PET
composites are 450oC and 456.0oC, respectively.
Toughener, Carbon nanotubes, (1)Carbon Nanotube: C100, the diameter is 10~40 nm,
Polyethylene Terephthalate, nanocompositesʳ
(2)VTMOS: Vinyl trimethoxy silane, 97 %, ALDRICH.
Carbon nanotube (CNT) generates a great potential
2.2 Preparation of modified MWNT
in the synthesis of polymer composite due to its excellent
T To prepare the MWNT which were modified by
axial tensile strength. In addition to the exceptional
free radical grafting. First, we should choose the best initial
mechanical properties, CNT possesses superior thermal
agent ( AIBN or BPO ) at 70 к for 5 hours. After that
and electrical properties such as high thermal stability up
we could obtain the MWNT which were modified by
to 2800ºC in vacuum, thermal conductivity about twice
VTMOS, and named VTMOS-MWNT in this study.
as high as diamond, and is 1000 times higher than copper
2.3 Preparation of MWNT /PET nanocomposite
wires in electric-current-carrying capacity [1-3].
Multiwall carbon nanotube and POE-g-MA were
The CNT-based composites have been intensively
prepared as masterbatch then compounded by a co-rotating type twin screw extruder with PET resin;
studied using different matrix polymer materials.
with L/D=43.5, and a high shear rate configuration. The
Rahul Sen and co-workers reports single-walled carbon
rotation speed is 100 rpm and barrel temperatures are
nanotube (SWNT) reinforced polyurethane composite
from 240ºC to 270ºC. Extruded material was cut into
membranes . All the membranes show a nonlinear
small pellets in a granulator. Dumb-bell shaped
elastic behavior in the low stress region (0-2 MPa) and
specimens were then injection moulded using a
Battenfeld, Ba750 CDPLUS injecting molding machine from dried pellets at a mould temperature of 260-290qC.
The objective of this study is to investigate the
The maximum injection pressure was 100 bars and the
effects of carbon nanotube contents and the modification
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