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Injection molding melt-shear behavior

BPA polycarbonate becomes plastic at temperatures around 220°C, The viscosity decreases as the temperature increases, exhibiting Newtonian behavior, with the melt viscosity essentially independent of the shear rate, At the normal injection molding temperature of 270-3l5°C, the melt viscosity drops from 1.100 to 360 Pa j s (11.000 to 3,600 poise). Because the viscosity of polycarbonate can only be reduced by increasing the temperature, the ultimate limit on molecular weight is controlled by the processing conditions and the thermal stability of the polymer. [Pg.1336]

Takahashi H (1990) Flow behavior of polymer melts under extremely high shear rates and flow analysis of injection molding. J Rheol (Jpn) 18 172-9. [Pg.300]

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Melt behavior

Melting behavior

Shear behavior