Abstract: Recycled high impact polystyrene plastic(rHIPS) was chain extended by pyromellitic dianhydride (PMDA) in twin-screw extruder, and the effects of PMDA content on molecular weight, mechanical properties, dynamic mechanical properties, melt fluidity and morphology of rHIPS were studied. The results indicated that, PMDA and rHIPS had a chain extension reaction, and the rlaive molecular weight was improved obviously. When the PMDA content was 0.9% (mass fraction, the same below), the impact strength of the rHIPS/PMDA blends reached 10.8 kJ/m2 and increased by 57%. With the increase of PMDA, the melting index decreased first and then tended to be smooth.The modulus of energy storage and loss modulus were increased, the fracture surface becamerough and the phase interface was blurred.
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2018, Vol. 32 
