JOURNAL OF POLYMER ENGINEERING

 Vol. 21, No. 5, 2001, page 421

COMPATIBILIZING EFFECT OF POLY(STYRENE-co-GLYCIDYL METHACRYLATE) IN MPPO/PBT BLEND: THE EFFECT OF BLENDING SEQUENCE

Soo Young Han¹, Tae Oan Ahn¹, and Han Mo Jeong^2*

 ¹Department of Chemical Technology, Seoul National University, Seoul 151-742, Republic of Korea

²Department of Chemistry, University of Ulsan, Ulsan 680-749, Republic of Korea

ABSTRACT

      The effect of blending sequence on the compatibilizing effect in a modified poly(2,6-dimethyl-1,4-phenylene oxide) (MPPO) / poly(butylene terephthalate) (PBT) blend, when three kinds of poly(styrene-co-glycidyl methacrylate) (SGMA) containing 4 mole-% (SGMA4), 9 mole-% (SGMA9), and 13 mole-% (SGMA13) of glycidyl methacrylate (GMA) repeating unit were used as compatibilizer, was studied by examining morphology, dynamic mechanical properties, rheological properties, and mechanical properties. In the blending sequence where PBT was blended with preblended MPPO/SGMA blend, the compatibilizing effect of SGMA4 was more evident than other SGMAs, whereas the compatibilizing effect of SGMA9 was most evident, when SGMA was preblended with PBT, before blending with MPPO. These results were somewhat different from our previous results that the compatibilizing effect of SGMA13 was most evident when PBT, MPPO, and SGMA were blended simultaneously. Simultaneously mixed blends had higher values of elongation at break and impact strength than those from other blending sequences. However, the blending sequence where MPPO was blended with preblended PBT/SGMA blend resulted in higher values of moduli.

 KEYWORDS

MPPO, PBT, poly(styrene-co-glycidyl methacrylate), blending sequence, compatibilizer

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