Problem 11.1 In Figure 11.24 we observe that the dj/D ratio of dispersed two-phase blends goes through a maximum at a certain critical blend ratio, and that measured values of dj/D ratio for blends are higher than those estimated from the linear additive rule with respect to blend composition. What might be a physical origin(s) of such experimental observations? Figure 11.24 Plots of dj/D ratio versus blend composition for HDPE/PS blends at 200C extruded in a capillary die with a length-to-diameter ratio of 12 for various wall shear stresses (Pa) : (O) 6.89104,()7.58105, and () 8.26105. (Reprinted from Han and Yu, Polymer Engineering and Science 12:81. Copyright 1972, with permission from the Society of Plastics Engineers.) Problem 11.1 In Figure 11.24 we observe that the dj/D ratio of dispersed two-phase blends goes through a maximum at a certain critical blend ratio, and that measured values of dj/D ratio for blends are higher than those estimated from the linear additive rule with respect to blend composition. What might be a physical origin(s) of such experimental observations? Figure 11.24 Plots of dj/D ratio versus blend composition for HDPE/PS blends at 200C extruded in a capillary die with a length-to-diameter ratio of 12 for various wall shear stresses (Pa) : (O) 6.89104,()7.58105, and () 8.26105. (Reprinted from Han and Yu, Polymer Engineering and Science 12:81. Copyright 1972, with permission from the Society of Plastics Engineers.)