Abstract: Blends of polystyrene(PS) with polyethylene(PE)or PE melt grafted with maleic anhydride(PE-g-MAH) and copolymer[Poly(St-Co-DMA)] of styrene(St)with dimethyl amino ethyl methacrylate(DMA) were prepared by blending in a Brabender mixer.The morphology of these blends was found to have the typical morphology of incompatible blends,where their reactive PS/PE-g-MAH/Poly(St-Co-DMA)blends showed a finer morphology,the particle size was greatly reduced and the size distribution became more uniform.This was attributed to the stronger polar interaction between the acidic anhydride and basic amino groups.Furthermore,the dynamic mechanical analysis measurements showed that the two glass transition temperature(T_g)peaks of reactive blends were closer than those of corresponding nonreactive blends. The mechanical properites of blends were improved.

Key words: Polymer blend, Reactive polymer, Basic group, Reactive compatibilizing