REDUCIBLE PROPERTY OF TEMPERATURE, RATE OF STRAIN, AND FILLER CONTENT EFFECTS IN DRAWING METALLIC GLASS-FILLED POLYPROPYLENE

In order to get basic data on drawing process which is necessary to make uniaxially oriented polymer composites, yield stress and strain, and necking stress of polypropylene filled with metallic glass powder were measured as functions of temperature, rate of strain, and filler content. At a given filler content, composite curves for both the yield and necking stress plotted against log of the strain rate at a certain temperature could be drawn by shifting the curves obtained at different temperatures along the axis of strain rate. The shift factor for the composition of a master curve could be expressed by the Arrheius equation with the activation energy which was independent of filler content, but changed at about 60%C due to a transition of the matrix polymer. These master curves for different filler contents could be further reduced into a composite curve by shifting them along the axis of strain rate, with shift factors proportional to the square root of volume fraction of the filler. These results show that the effects of temperature, rate of strain, and of filler content on the yield and necking stresses can be convertible to each other by simple laws. As to the effects on the yield strain, such a convertibility could not be observed. © 1978, The Society of Polymer Science, Japan. All rights reserved.