4
fractured surface into a hot xylene for 15 min. The samples were later dried in oven at 40°C for 48 h to eliminate the
contamination of the solvent. The dried surfaces were later gold-coated and examined by scanning electron
microscope.
Results and discussion
Mechanical and aging properties
Figure 1
Stress-strain curves of TPVs based on ENR/EVA/PP blends with the various of ENR/EVA ratio
Table 2
Mechanical and aging properties of TPVs based on ENR/EVA/PP blends with the various of ENR/EVA ratio
properties
ENR/EVA/PP ratio
60/0/40
45/15/40
30/30/40
15/45/40
0/60/40
Tensile strength (MPa)
9.25±0.29
10.03±0.18
11.44±0.04
10.85±0.23
10.87±0.25
Elongation at break (%)
225±6.66
251±5.13
295±2.08
294±3.61
300±10.39
Tension set (%)
27.5±0.87
32.5±0.58
33.5±0.57
57.5±1.44
62.5±1.44
Retention of Tensile
strength (T.S) (%)
66.7
74.88
85.49
85.9
104.42
Retention of Elongation at
break (E.B.) (%)
36.89
50.2
85.08
89.8
90
Nature of deformation of the dynamically cured ENR/EVA/PP blends or TPVs under an applied load can
be visualized by the stress-strain curves, as shown in Figure 1. It is seen that the Young’s modulus based on a slope of
the initial curve of ENR/EVA/PP at 60/0/40 exhibited the lowest value. Furthermore, increasing trend of Young’s
modulus was observed with increasing the EVA content in TPVs. This was attributed to the crystalline content of
EVA provided strength properties to the material. Elongation at break and tensile strength of different types of
dynamically cured ENR/EVA/PP blends are shown in table1. It can be seen that the Elongation at break of TPVs of
