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

PVOH Research Main project page
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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)