分子量の異なるアクリロニトリルスチレン共重合体混合物の超高せん断速度下の溶融流動特性

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  • Flow Curves of Mixtures of Acrylonitrile-Styrene Copolymers with Different Molecular Weights at Extremely High Shear Rates

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The flow curves of mixtures of acrylonitrile-styrene copolymers with the same S/AN ratio (70/30) and different molecular weights (SAN-1; Mw=1.88×105, SAN-2; Mw=6.5×104) were measured up to the shear rate of 107 s-1. The second Newtonian and the second non-Newtonian region were observed for SAN-1, SAN-2 and their mixtures (<106 s-1) following the first non-Newtonian region. The viscosity decreased with decrease of molecular weight (increase of SAN-2 content) and the gradient of the flow curve (log viscosity vs. log shear rate) of the mixture became smaller with decrease of molecular weight in the first non-Newtonian region. Flow behavior of the mixture was quite different from that of the immiscible polymer blends. The flow curves of SAN with different molecular weights (≥1.28×105) united into one curve at the shear rates higher than 5×105s-1.

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