Once the solutions are prepared, a thoroughly clean capillary viscometer is introduced into a bath of water or oil at controlled temperature. The viscometer containing the pure solvent is left at least for 20 min in the bath in order to reach thermal equilibrium. Once the temperature is stable, a chronometer is used to measure the time it takes for the solvent to flow between the two marks of the viscometer. This measurement is carried out at least seven times in order to obtain the average time of flow. Once the time of the solvent flow is measured, the solvent is removed from the viscometer and the previous procedure is repeated for the solution with the highest polymer concentration. Again, the sample is left for at least 20 min in the bath at controlled temperature and, upon reaching thermal equilibrium, the flow time measurements are carried out at least seven times in order to obtain the average flow time. The procedure is followed for all the polymeric solutions prepared. Once the flow times of the solvent and of the different solutions are registered, the data are plotted as described in the previous section. The inherent or reduced viscosity is plotted against concentration, and from the linear plot obtained, the intrinsic viscosity is obtained using the Huggings or Kraemer equations. Intrinsic viscosity is obtained by the extrapolation of the curve obtained to zero concentration (intercept with the y-axis). The plot obtained should be a straight line; if the curve obtained is not a straight line, more dilute solutions of the polymer should be prepared and the measurements repeated to obtain a linear behavior.