52
without calcium carbonate fillers. As for the tensile stress improvement due to addition of calcium carbonate fillers, there is bonding happens between the
epoxy composite. The bond’s strength is good, hence causing higher energy to break the bond. This is resulting higher tensile stress needed.
53
SAMPLE wt of
CaCO
3
MAGNIFICATION 21 X
500 X 1.00 K X
2
Figure 4.11 : Scanning Electron Micrograph of tensile Fractured Surface of 0 and 2 weight of nano-CaCO
3
54
SAMPLE wt of
CaCO
3
MAGNIFICATION 21 X
500 X 1.00 K X
4
6
Figure 4.12 : Scanning Electron Micrograph of tensile Fractured Surface of 4 and 6 weight of nano-CaCO
3
55
SAMPLE wt of
CaCO3 MAGNIFICATION
21 X 500 X
1.00 K X
8
Figure 4.13 : Scanning Electron Micrograph of tensile Fractured Surface of 8 weight of nano-CaCO
3
56
56
CHAPTER 5
CONCLUSIONS AND RECOMMENDATIONS
5.0 CONCLUSIONS
After all the testing and result analysis, it can be concluded that the objective to determine the effect of nano-CaCO
3
to mechanical properties of e p o x y c o m p o s i t e r e i n f o r c e d recycle rubber has been achieved. All the
mechanical properties of these specimens were determine by conducting the tensile test, impact test, Scanning Electron Microscope SEM and microhardness
test. The effects of nano-CaCO
3
towards mechanical properties of epoxy composite can be explained by the analysis of the microstructure.
The whole experiment and the study effect of nano- CaCO
3
towards mechanical properties can be summarized as below:
1. The tensile stress of polymer matrix composite are been affected by the nano CaCo
3
. Higher nano CaCo
3
produced higher tensile stress and tensile strain. The maximum stress obtained at higher nano CaCo
3
is 22.64 Mpa
2. The tensile strain increase as the nano-CaCo
3
is increase. Material behaves more ductile as the nano-CaCo
3
is increase.
3. The tensile strain is decrease as nano CaCo
3
increase. This means the brittle increase as nano CaCo
3
is lower.
