Abstract:
Residual softwood sawdust (RSS) is incorporated into polystyrene (PS). PS has sufficient high molecular weight with molecular weight 280000 g/mol. The PS composite was prepared by melt mixing technique. The dynamic mechanical tests are carried out using ARES-rheometer (Rheometric Scientific, USA) in the dynamic mode and parallel plate geometry with diameter 25 mm. The measurements were performed at temperatures ranged from 140 to 240°C and frequencies varied from 0.1 to 100 rad/s at strain 1 % and gap setting 2 mm. The dynamic mechanical properties in terms of relaxation stress modulus Gt, shear creep J(t), torque and compliance moduli for fiber -filled PS composite have been studied and compared with the original material of neat PS. The relaxation and Retardation spectra of PS composite and pure PS are evaluated.
The results showed that the dynamic mechanical moduli are found to be improved by the incorporation of residual softwood sawdust. Therefore, Fiber-filled composites have much potential for applications of environmentally degradable plastics owing to their strength and stiffness.
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