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Abstract
Poly(ethylene terephthalate) (PET) was blended with polystyrene (PS) and poly(styrene-co-maleic anhydride) (PScMA). The two blend systems were immiscible based on the glass transition temperatures measured by differential scanning calorimetry (DSC). In the case of 70 and 90% PScMA blends, the reaction between ester groups of PET and maleic anhydride (MAH) sites on PScMA occurred during melt mixing at 280°C for 30min. The reaction was confirmed indirectly by thermal data, from the increase in the complex viscosity and from the solubility difference between the blends. The particle size in PET/PScMA reactive blends was smaller than that of the non-reactive blends. The mechanical properties such as tensile strength and modulus were not affected by the reaction.
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