6
Figure 4
Tan
δ
of TPVs based on ENR/EVA/PP blends with the various of ENR/EVA ratio
Figure 2,3 shows the storage modulus and complex viscosity as a function of frequency. As expected, the
storage modulus or elastic response of the material increased with the frequency. It was seen that the storage modulus
decreased with increasing EVA content. The complex viscosity decreased with increasing frequency. This indicates
shear-thinning nature of the blend systems. It was also seen that at a given frequency, the complex viscosity decreased
with EVA content in the TPVs. The viscosity of the blends depends on interfacial thickness and level of interfacial
adhesion. From figure 4, it is seen that tan
δ
decreased when frequency increased. This is attributed to increasing
elastic respond of the material upon increasing of frequency. Therefore, increasing tan
δ
with increasing EVA content.
This indicates decrease of the elasticity of the TPVs.
Thermal properties
Figure 5
TGA thermogram of
pure ENR-25 and pure EVA
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28
