Results (
Thai) 2:
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Fig. 1 shows the Tensile Stress for all specimen no. 1 to 5 with different weight percentage (wt.%) of AC.
It was shown that tensile stress trend for AC with 6wt% composite has maximum tensile stress with 30MPa.
T
he trend shows that specimen with 4wt% and 2wt% of AC content increased gradually the stress continued
f
or all specimens while 6wt% decreased the stress until specimen no.5. Specimen with 2wt% shows maintain
the stresses and probably is consider as good specimen but still lower stress value on average 20.56MPa. The
increasing of AC content internally occurred might be made the strengthen of specimen higher than others. It
can
be seen that tensile stress of the composites increase with an increase of the filler content. The composites
demonstrate somewhat linear behavior to end of specimen no.5. The tensile stress increased also support from
the previous work where AC content was increased [9,10,11]. Mechanical properties of AC+P
P composites
depend on several factors such as the stress–strain behaviours of carbon and matrix phases, the phase volume
f
ractions, the carbon concentration, the distribution and orientation of the carbon or fillers relative to one
another. The increase of the filler content, results in the increase in tensile stress. This is due to the fact that
AC filler particles strengthen the interface of PP matrix and filler materials. The maximum tensile strength for
6wt% filler composite was higher (30.00 MPa) compared to other two combinations. The result also support
f
rom the previous report when ester linkage between cellulosic filler and polypropylene molecule [9]. While
th
e trend for AC with 4wt% slightly decreases from sample no. 1 to 4 but then jump to 21.77MPa for last
sample. If compared with AC 2wt% shows that it was maintain their strength with 23MPa on average. It can
be seen that at lower concentration of the filler material, specimen 2wt% of AC with PP is 8wt%
demonstrated slightly linear behaviour prior to sharp failure or fracture. This means that specimen deformed
plastically immediate after elastic deformation. Fig. 2 shows the tensile strain test result for difference wt%
f
or all samples. The sample with lower AC concentration 2wt% has good strain result such as sample no. 1
has maximum tensile strain at 6.27%. Similar with sample PP 6wt% + AC 4wt% even though strain is
in
creased at 5.74% but then decreased at same end point for sample PP 8wt% + AC 2wt% . This trend might
be i
mpacted the performance of AC-reinforced plastic composites depends on many factors including the
n
ature of the constituent, carbon/matrix interface, the construction and geometry of the composite and test
conditions. The nature of the interface region is extreme importance and is directly related to the toughness of
the composite [9]. The impact property of a material is its capacit
y to absorb and dissipate energies under
impact or shock loading. Fig. 3 shows the Izod Impact test result for different AC + PP weight percentage for
all sa
mples. It was observed that the Izod impact strength of PP 6wt% + AC 4wt% composites found higher
i
mpact value reach 130J better than others composites. Particle size, shape and carbon surface properties have
th
e influence on this sample. This result agrees with previous report due to in fluency of AC contents [12].
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