Interrelationships of Pressure-Dependent Hole Fraction and Elongational Viscosity in Polymer Melts

Figure 4

The logarithm of viscosities versus thermooccupancy function for HDPE (a) at the zero level of elongational and the constant elongational rates (=60, 107, and 148 ), and (b) constant elongational stresses ( = 800, 1400, and 2000 kPa). Solid lines represent linear fitting through each data set by (7) and (8) with the parameters tabulated in Tables 2–4.