溶融高分子の超高速せん断流動と射出成形流動解析(日本レオロジ-学会有功賞受賞講演)
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概要
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A capillary rheometer to achieve an extremely high shear rate was developed and applied to homogeneous polymer systems, polymer blends and solid particle filled polymer systems. Two non-Newtonian regions and a Newtonian region between them were observed in the wide range of shear rates up to 10<SUP>7</SUP> s<SUP>-1</SUP>. The flow behavior in high shear rate results from high orientation and scission of macromolecular chains.<BR>For the calculation of the viscosity-shear rate curves of blends, a concentric multilayer model was proposed. The model was proved to be useful not only for immiscible polymer systems, but also for miscible polymer blends in which some amount of macromolecules of each component could behave independently. The extremely high shear rate processing was applied to the immiscible blends to investigate a modification by the microstructure development in polymer blend by shear. Incompatible blends of SAN and PC were extruded with extremely high shear rate. Compatibility of SAN with PC was enhanced in extremely high shear rate processing. Fibrillation of PA-6 phase was obtained for HDPE-PA-6 blends by injection molding under extremely high shear at a temperature between the melting points of HDPE and PA-6. Flow analysis program for injection molding was developed by using the Flow Analysis Network Method (FAN). Flow behavior of polymer melts at the high shear rates was applied to the flow analysis program to improve the accuracy of the analysis.
- 日本レオロジ-学会の論文
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