Sample Calculation of Solution Viscosity

The Mark-Houwink-Sakurada constants for PMMA resin are o = 0.73 and K = 1. X 10 Table 3.3 contains solvent viscosity versus concentration data. Find the intrinsic viscosity using both the specific and relative viscosities and the viscosity average molecular weight. 

The relevant equations are Eqs. 3.20 and 3.21 for the relative viscosity and specific viscosity, respectively. The values for these terms and plotting terms are provided in Table 3.4. 

a plot is made for the terms and n(ri )/c as a function of c as was shown in Fig. 3.7. Extrapolation of the functions to a concentration of zero provides the intrinsic viscosity of 0.565 dl/g, as shown in Eig. 3.8. Using Mark-Houwink-Sakurada Eq. 3.22, the viscosity average molecular weight is calculated at 221,000 kg/kg-mole. 

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