Problem 13.2 The shear-rate dependent viscosity of an LDPE (Rexene 143) may be described by Eq. (6.10) with 0=1.06104Pas,1=0.62s, and n=0.224 at 160C. Note that the shear-rate dependent viscosity () of LDPE(FC114) mixtures at any temperature for a specified blowing agent (FC-114) concentration can be estimated once the viscosity () of Rexene 143 is known because plots of / given in Figure 13.11 are independent of shear rate and temperature. Calculate, with the aid of Eq. (13.6), the known because plots of / given in from 102 to 103s1 and prepare plots of ()/0 versus 1 for the mixture