5
increased with increasing EVA content, but tensile strength increased with increasing EVA content in a range of 15
to 30 wt%. That is, the elongation at break and strength properties increased with the EVA content, which is in
agreement with the results reported previously reported (Mohamad
et al.,
2006). This phenomenon occurred because
the crystalline regions of EVA underwent rearrangement to accommodate more stress and exhibited the highest
elongation at break and tensile strength. Tension set was determined by extending the TPV specimen at 100%
elongation for 10 min. Dimension of the specimen was measured and compared between before and after elongation.
It can be seen that the tension set increased with an increasing EVA content in the blends. This indicates decreasing
trend of elastomeric properties of the TPVs.
The percentage retention of tensile strength and elongation at break, after aging the TPVs was determined as
a function of ENR/EVA ratio in table1. It can be seen that the percentage retention of tensile strength and elongation
at break were increased with increasing EVA content. This was attributed to the EVA proportion provided the good
aging resistance.
Dynamic properties
Figure 2
Storage modulus of TPVs based on ENR/EVA/PP blends with the various of ENR/EVA ratio
Figure 3
Complex viscosity of TPVs based on ENR/EVA/PP blends with the various of ENR/EVA ratio
