Experiment 54 Capillary Viscometry

Set up a constant temperature bath for capillary viscometry at a temperature of 25°C. 

Obtain a capillary viscometer with a known calibration constant. Also obtain samples of the following alcohols methanol, ethanol, 1-propanol, 2-propanol, 1-butanol, and any others your instructor may suggest. 

Pour the first liquid to be measured into the viscometer tube and place the tube in the constant temperature bath. After allowing plenty of time for the temperature to equilibrate, measure the time of flow in the manner discussed in Section 15.2.4. Using the known calibration constant, calculate the kinematic viscosity at 25°C. Repeat with each of the other alcohols. 

Obtain an unknown alcohol from your instructor. Perform step 3 with this alcohol and identify it. 

Maintain the logbook for the equipment used in this experiment, recording your name(s), the date, and the experiment number and name. 

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In addition, data on the size, shape and solvation of the polymer particles in aqueous solutions at temperatures below and above the transition phenomena registered by HS-DSC have been obtained [42]. Table 2 shows the results of capillary viscometry and light scattering experiments for the fractions p and s of poly(NVCl-co-NVIAz) synthesized at 65 °C from the feed with the initial molar comonomer ratio equal to 85 15. Since fraction p precipitates from the aqueous solution at temperatures > 34 °C, its intrinsic viscosity can be determined only at 20 °C, whereas for the fraction s such measurements were possible above and below the temperatures of the HS-DSC-registered conformational transition. 

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