Abstract:
In this work, polystyrene/waste tires composites were prepared using the melt-mixing method. The viscoelastic properties of PS and PS/composite have been evaluated and compared. These properties were studied using ARES-Rheometer under nitrogen atmosphere in parallel plate geometry with diameter 8 mm. The measurements are carried out over a wide range of temperatures ranged from 120°C to 220°C and frequencies from 100 to 0.1 radians per second. The dynamic and complex viscosity of the PS composites were studied and compared with those of unfilled PS.
The results showed that the frequency, w is shifted from 0.46 to 0.072 radians/s and the value of dynamic viscosity increases from 5.0´104 to 1.3´105 Pa.s by the addition of the rubber for PS. Zero-shear viscosity, h0 was found to be increased from is 9.5´104 for PS/waste tire composite to 4.5´104 for PS.
The flow activation energy is calculated from h0 by using the rheometric software to be 1.063 ´105 and 1.46 ´105 J/mol.K for Ps and PS composite, respectively.
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