Flow behavior of poly(phenylene oxide)-polystyrene blends under extremely high shear rates.

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Other Title
  • ポリフェニレンオキシド‐ポリスチレンブレンドの超高せん断速度下の溶融流動特性
  • ポリフェニレンオキシド ポリスチレン ブレンド ノ チョウ コウ センダン ソ

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Abstract

The flow curves of miscible blends of poly (phenylene oxide) (PPO) and polystyrene (PS) were measured at shear rates up to 107s-1. The component polymers have quite different glass transition temperatures; the blend has one glass transition temperature between those of the component polymers. A second Newtonian region was observed for PS in a high shear rate region (>106s-1) following the first non-Newtonian region. An increase in the viscosity was found at a shear rate of about 3.5×106s-1, above which the second non-Newtonian region appeared. The viscosity of PPO 50%-PS50% blend was higher than that of PS at shear rates up to 107s-1 and the non-Newtonian region was observed in the flow curve of the blend. The flow curve of PP030%-PS70% blend was near to that of PS at the low shear rate region and was near to that of PPO50%-PS50% blend at the high shear rate region. A pseudo-Newtonian region was observed in between. The second Newtonian region was observed for PPO10%-PS90% blend. The beginning point of the pseudo-Newtonian or Newtonian region shifted to the higher shear rate with increase of PS content. The flow behavior of miscible blends of PPO and PS was very similar to that of immiscible polymer blends. The flow behavior of miscible blends is considered to depend on the mixing level of macromolecules of each component and to be similar to that of immiscible polymer blends when some amount of macromolecules of each component can behave independently of each other. Nuclear spin-spin relaxation time measurements on the blends exposed to the high shear proved this consideration.

Journal

  • KOBUNSHI RONBUNSHU

    KOBUNSHI RONBUNSHU 47 (7), 611-617, 1990

    The Society of Polymer Science, Japan

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