3. You are asked to perform a molecular weight characterization of poly(methyl methacrylate) (PMMA) by viscosity measurements in chloroform which is a good solvent at 25C. (a) Determine the intrinsic viscosity by plotting both ninh and ns/cusing the data below. t/t. [g/dL) 0.19 0.38 0.50 0.61 1.27 1.60 1.82 2.05 (b) The Polymer Handbook lists the following Mark-Houwink parameters at a temperature of 25C in chloroform. Use these parameters to calculate the value for this polymer. What can you conclude about the need for highly accurate Mark-Houwink parameters? a K [d/g] 0.80 4.8 x 10 5.8 x 10 3.4 x 105 0.79 0.83 (c) If you repeated your viscosity measurements with PMMA in a theta solvent, how would you expect the intrinsic viscosity to change? Explain