User:Karlena L. Brown/Notebook/PVOH Research/2012/09/11

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OBJECTIVES

  1. Label and remove previous PVOH films from Teflon dishes
  2. Select two types of PVOH for viscosity testing and measurements
  3. Complete viscosity calculations and graphing

Viscosity Preparations and Calculations

Creating Stock Solutions:

  • In 600mL beaker, add 200mL of H2O and ~ 2 grams PVOH (MW 22K) with a large magnetic stir bar

(Initial Mass = 2.0256g)

  • Heat and stir solution for ~ 45 minutes at 100 - 120°C
  • Over a period of ~ 30 minutes, add an additional ~ 5 grams of PVOH (MW 22K) to solution, stirring frequently to limit frothing

(Total Mass In Solution = 7.0158g) (Concentration = 638μM)

  • When PVOH thoroughly dissolves, transfer solution to 500mL volumetric flask to cool to room temperature
  • After cooling, add more water to the volumetric flask to bring solution to volume

* Repeat the entire process again; however use PVOH (MW 130K)

(Initial Mass = 2.0342g) (Total Mass In Solution = 7.0545g) (Concentration = 109μM)


Dilution Standards for Stock Solutions PVOH:

  • In 5 separate 50mL volumetric flasks, select and create various dilute PVOH (MW 22K) solutions for viscosity testing
  • After creating dilute samples, begin testing the viscosity rates by pouring one solution, ~ 15mL, into a viscometer

(Dilute Sample Concentrations PVOH (MW 22K) = 79.7μM, 159μM, 319μM, 478μM)

  • Using vacuum pump, suck up a solution into the viscometer until it reaches the top line of the first bulb on viscometer
  • Once the solution surpasses the second line on the first bulb, begin timing to measure viscosity rate of the solution
  • Take three readings for each solution, then average the time trials

* Repeat the entire process again; however use PVOH (MW 130K) stock solution

(Dilute Sample Concentrations PVOH (MW 130,000) = 13.6μM, 27.1μM, 54.3μM, 81.4μM)

Viscosity Charts and Tables PVOH (MW 22K)

Viscometer Model 2189: (40°C / 100°F - 0.003966 and 100°C / 210°F - 0.003950)

Viscosity of pure H2O

Trial [ ] Time [s]
1 278.69
2 283.09
3 280.24
Average 241.01


Viscosity of 79.7μM

Trial [ ] Time [s]
1 279.37
2 281.97
3 283.12
Average 281.49


Viscosity of 159μM

Trial [ ] Time [s]
1 246.42
2 450.31
3 251.86
Average 316.20


Viscosity of 319μM

Trial [ ] Time [s]
1 273.99
2 276.73
3 278.63
Average 276.45


Viscosity of 478μM

Trial [ ] Time [s]
1 272.81
2 278.39
3 280.43
Average 277.21


Viscosity of 638μM

Trial [ ] Time [s]
1 386.09
2 399.45
3 703.49
Average 496.34

Viscosity Charts and Tables PVOH (MW 130K)

Viscometer Model 2189: (40°C / 100°F - 0.003966 and 100°C / 210°F - 0.003950)

(Use Viscosity Chart of Pure H2O Listed Above)

Viscosity of 13.6μM

Trial [ ] Time [s]
1 263.59
2 263.12
3 263.01
Average 263.24


Viscosity of 27.1μM

Trial [ ] Time [s]
1 322.23
2 316.28
3 316.25
Average 318.25


Viscosity of 54.3μM

Trial [ ] Time [s]
1 400.68
2 398.66
3 398.73
Average 399.36


Viscosity of 81.4μM

Trial [ ] Time [s]
1 604.14
2 610.79
3 608.64
Average 607.86


Viscosity of 109μM

Trial [ ] Time [s]
1 956.96
2 957.38
3 957.46
Average 960.60

Notes

  • Pure H2O was used as a standard for establishing a viscosity rate for a pure substance
  • Pure H2O was also used as a cleaning agent between trials
  • During the first two trials for the PVOH (MW 22K), the viscometer was accidentally not cleaned between trials

(viscosity calculations effected for PVOH MW 22K)



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