ガラス短繊維充填ポリプロピレンの二軸伸長流動挙動と繊維分散・配向状態の解析

概要

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Change in fiber orientation in glass fiber filled polypropylene (PP/GF) melts was observed with scanning electron microscopy after quenching the samples in biaxial extensional flow. The upturn of biaxial extensional viscosity from the low strain rate asymptote decreases by the addition of glass fibers, due to suppression of polymer chain extension. When the binder of glass fibers is immiscible with the matrix, fiber dispersion becomes worse and there appears a very small upturn in the biaxial viscosity. It has been found that there is an appropriate range of strain rate where the glass fibers orient well to the flow direction. This range corresponds to the range where the strain rate is much greater than the rate of fiber orientation and it is smaller than or comparable with the relaxation rate of the matrix chain. In this range, the degree of fiber orientation decreases with increasing the strain rate. It is suggested that the fibers take time to orient and cannot follow the fast flow in this range where the matrix does not have enough power to orient the fibers.
日本レオロジー学会の論文
2001-09-01