User:Moira M. Esson/Notebook/CHEM-581/2012/09/14: Difference between revisions
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==Objectives== | ==Objectives== | ||
*Crosslink the prepared glutaraldehyde film | *Crosslink the prepared glutaraldehyde film | ||
*Run DSC on | *Run DSC on 3 films | ||
*Run FTIR | *Run FTIR | ||
==Crosslinking of Glutaraldehyde film== | ==Crosslinking of Glutaraldehyde film== | ||
General Protocol: | General Protocol: | ||
#Allow the glutaraldehyde PVOH film to completely air dry | #Allow the glutaraldehyde PVOH film to completely air dry | ||
#Prepare a solution of 100mL | #Prepare a solution of 100mL H<sub>2</sub>O, 2mL concentrated H<sub>2</sub>SO<sub>4</sub>, and 20g Na<sub>2</sub>SO<sub>4</sub> in a 150mL beaker. Place stir bar in beaker and a Buchner funnel top over the stir bar | ||
# | #Heat the prepared solution to 70°C(on hot plate turn temperature to 160°C) | ||
#Place film in solution for 1 hour.(Make sure the temperature remains at 70°C) | |||
#Prepare 100mL 1% aqueous HCl solution. Heat solution to 70°C | |||
#Remove film from the solution and rinse with deionized H<sub>2</sub>O | |||
#Place stir bar in 1% HCl solution and a Buchner funnel top over of the stir bar. Add the PVOH film to the solution | |||
#Allow film to remain in 1% HCl solution for 30 minutes.(Be sure to keep a constant 70°C) | |||
#Prepare 0.2M sodium bicarbonate solution | |||
#After 30 minutes, remove film from 1% HCl solution and place in 0.2M sodium bicarbonate solution for ~15minutes | |||
#Remove film from dilute sodium bicarbonate solution with tweezers. Rinse with deionized H<sub>2</sub>O and dry film on paper towel(dabbing gently). | |||
#Weigh PVOH film. Record mass | |||
<br> | |||
'''Solution Preparations''' | |||
{| {{table}} | |||
| align="center" style="background:#f0f0f0;"|'''''' | |||
| align="center" style="background:#f0f0f0;"|'''Solution 1''' | |||
| align="center" style="background:#f0f0f0;"|'''1% Aqueous HCl''' | |||
| align="center" style="background:#f0f0f0;"|'''0.2M Sodium Bicarbonate''' | |||
|- | |||
| Mass Na<sub>2<sub/>SO<sub>4<sub/> added(g)||20.0050||0||0 | |||
|- | |||
| Amount of [H<sub>2<sub/>SO<sub>4<sub/>]added (mL)||2.00||0||0 | |||
|- | |||
| Amount of [HCl] added(mL)||0||1.00||0 | |||
|- | |||
| Amount of Sodium Bicarbonate(g)||0||0||1.6804 | |||
|} | |||
<br> | |||
'''Note''': | |||
*After treatment with solutions, the glutaraldehyde film had a mass of 0.5126g | |||
*After treatment with solutions, the glutaraldehyde film had more of a rubber like texture and was less transparent | |||
==DSC on Crosslinked PVOH MW(22,000) films== | |||
Films were put in the DSC following the standard protocol | |||
* Crosslinked PVOH (MW 22000): | |||
** Pan mass: 49.14 mg | |||
** Sample mass: 3.07 mg | |||
* Crosslinked PVOH (MW 22000), 10% maleic acid, HCl: | |||
** Pan mass: 50.57 mg | |||
** Sample mass: 3.14 mg | |||
* Crosslinked PVOH (MW 22000), 10% succinic acid, HCl: | |||
** Pan mass: 49.01 mg | |||
** Sample mass: 2.86 mg | |||
'''General Observations''': | |||
*The crosslinked PVOH MW22,000+[HCl]+10% maleic acid and PVOH MW 22,000+[HCl}+10% succinic acid after crosslinking turned very rigid, shiny and black | |||
==FTIR on PVOH(MW 22,000) Thin Film== | |||
[[Image:FTIR PVOH(22K).JPG]] | |||
*'''Note''': It is necessary to redo this analysis. The scan losses resolution around 3700 to 3000 cm<sup>-1</sup>, indicating that the film is too thick for FTIR. A thinner film of the same MW will be prepared and analyzed | |||
==DSC run today== | |||
* Using the standard protocol of DSC described on 9/12/2012, the following films were analyzed using DSC: | |||
# PVOH (MW 22000) | |||
# Crosslinked PVOH (MW 22000) | |||
# PVOH (MW 22000), 10% succinic acid, HCl | |||
# PVOH (MW 22000), 10% maleic acid, HCl | |||
# Crosslinked PVOH (MW 22000), 10% maleic acid, HCl | |||
# Crosslinked PVOH (MW 22000), 15% succinic acid, H<sub>3</sub>PO<sub>4</sub> | |||
# Crosslinked PVOH (MW 22000), 15% maleic acid, H<sub>3</sub>PO<sub>4</sub> | |||
# Crosslinked PVOH (MW 22000), 10% succinic acid, HCl | |||
Revision as of 21:08, 14 October 2012
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Objectives
Crosslinking of Glutaraldehyde filmGeneral Protocol:
DSC on Crosslinked PVOH MW(22,000) filmsFilms were put in the DSC following the standard protocol
General Observations:
FTIR on PVOH(MW 22,000) Thin Film
DSC run today
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