Question

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 25°C. (a) Determine the intrinsic viscosity by plotting both ?inh and ?sp/c using the data below. c [g/dL] | t/t0 0.19 | 1.27 0.38 | 1.60 0.50 | 1.82 0.61 | 2.05 (b) The Polymer Handbook lists the following Mark-Houwink parameters at a temperature of 25°C in chloroform. Use these parameters to calculate the Mv value for this polymer. What can you conclude about the need for highly accurate Mark-Houwink parameters? K [dL/g] | a 4.8 x 10^-5 | 0.80 5.8 x 10^-5 | 0.79 3.4 x 10^-5 | 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.

          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 25°C.
(a) Determine the intrinsic viscosity by plotting both ?inh and ?sp/c using the data below.
c [g/dL] | t/t0
0.19 | 1.27
0.38 | 1.60
0.50 | 1.82
0.61 | 2.05
(b) The Polymer Handbook lists the following Mark-Houwink parameters at a temperature of 25°C in
chloroform. Use these parameters to calculate the Mv value for this polymer. What can you conclude
about the need for highly accurate Mark-Houwink parameters?
K [dL/g] | a
4.8 x 10^-5 | 0.80
5.8 x 10^-5 | 0.79
3.4 x 10^-5 | 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.

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 25°C.
(a) Determine the intrinsic viscosity by plotting both ?inh and ?sp/c using the data below.
c [g/dL] | t/t0
0.19 | 1.27
0.38 | 1.60
0.50 | 1.82
0.61 | 2.05
(b) The Polymer Handbook lists the following Mark-Houwink parameters at a temperature of 25°C in
chloroform. Use these parameters to calculate the Mv value for this polymer. What can you conclude
about the need for highly accurate Mark-Houwink parameters?
K [dL/g] | a
4.8 x 10^-5 | 0.80
5.8 x 10^-5 | 0.79
3.4 x 10^-5 | 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.

Added by Dan C.

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