Studies On The Properties Of Conductive Particulate Fillers Filled Rubber Composites
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Date
2008-01
Authors
MAT JUNOH, MOHD ANUAR
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Abstract
The use conductive fillers on properties of rubber composites were studied. Three
types of conductive filler has been used in this study i.e. aluminium, zinc and carbon
black. Natural rubber (NR) and Ethylene-Propylene-Diene terpolymer (EPDM) were
chosen as a matrix. Compounding was carried out using two roll mill based on a semiefficient
vulcanization (semi-EV) system. The investigation of rubber composites
properties involves curing characteristics, mechanical and electrical properties,
thermogravimetric analysis (TGA) , morphological study and swelling behavior. The
scorch and cure time of aluminium and zinc filled natural rubber composite decreased
while maximum torque increases with increasing filler loading. Zinc filled natural rubber
composites exhibit higher tensile strength and elongation at break but lower in tensile
modulus compared to aluminium filled natural rubber composites. Zinc filled natural
rubber composites shows higher crosslink density than aluminium filled natural rubber
composites. However, the addition of aluminium and zinc filler reduced the electrical
resistivity and increased the thermal stability of the natural rubber. The presence of
aluminium fillers in EPDM composites shorten the scorch and cure time. Aluminium
filled natural rubber composites exhibits higher tensile strength, tensile modulus and
elongation at break compared to aluminium filled EDPM composites.
Thermogravimetric analysis (TGA) study shows an increment in thermal stability after
the addition of aluminium filler in natural rubber and EPDM rubber composites. On the
other hand, EPDM rubber composites shows higher thermal stability and crosslink
density compared to that of natural rubber composites. The presence of carbon black
in AIICB system increased thermal stability of AIICB hybrid composites. Tensile
strength and tensile modulus increased with increasing carbon black in the AI/CB
hybrid NR system. The electrical resistivity of natural rubber composites decreased
with the addition of carbon black in the system. In addition, the swelling behavior study
shows that the crosslink density can be increased by replacement of aluminium with
carbon black due to the increment in rubber-filler interaction. Thermal ageing of rubber
composite at 100°C for 48 hours decreased the tensile strength due to the
deterioration of rubber matrix.
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Keywords
Studies On The Properties Of Conductive Particulate , Fillers Filled Rubber Composites