User:Moira M. Esson/Notebook/CHEM-581/2012/11/09

From OpenWetWare

(Difference between revisions)
Jump to: navigation, search
(General Formula for reactions)
(Calculations)
Line 21: Line 21:
<br>
<br>
==Calculations==
==Calculations==
 +
*Overall, want to determine if have 1g of material how many moles of -OH groups. Once that is determined, will want to determine how many moles of -OH was reacted after the reaction.
 +
'''Number of moles of OH groups in 1g PVOH''':
 +
MW of repeating polyvinyl alcohol unit [C<sub>2</sub>H<sub>3</sub>OH]: 44.06g/mol
 +
 +
[http://www.britannica.com/EBchecked/topic/469236/polyvinyl-alcohol-PVA Polyvinyl alcohol repeating unit picture]
 +
 +
  1gPVOH(1mol PVOH unit/44.06g) x (1mol OH/1mol PVOH unit)= 0.022696 mol OH/g
 +
'''Dye attachment calculations''':
 +
*Want to react .01% of the OH groups with the dye
 +
MW 5-DTAF dye: 495.28g/mol
 +
<br>
 +
  (0.0227mol OH/g) x (.0001)= 2.27x10<sup>-6</sup> moles dye
 +
<br> 
 +
  2.27x10<sup>-6</sup> moles dye x(495.28g dye/1mol dye)=0.001124g dye
<!-- ##### DO NOT edit below this line unless you know what you are doing. ##### -->
<!-- ##### DO NOT edit below this line unless you know what you are doing. ##### -->

Revision as of 16:37, 26 November 2012

Project name Main project page
Previous entry      Next entry

Objectives

  1. Prepare solutions to run new PVOH based reactions

General Formula for reactions

Polyvinyl alcohol + [HAc]→Polyvinyl acetate

General Protocol for Polyvinyl acetate synthesis

  1. For a 1:1 ratio of polyvinyl alcohol OH groups to polyvinyl acetate dissolve ~1g PVOH inH2O
  2. Add ~1.36g HAc. Add ~2 drops of HCl to reaction mixture to catalyze reaction.
  3. Heat the reaction mixture to 40°C.
  4. Allow the reaction to stir for 1 hour
  5. Add sodium bicarbonate solution to the reaction mixture(titrate the reaction)
  6. Rotavap the remaining reaction mixture


Calculations

  • Overall, want to determine if have 1g of material how many moles of -OH groups. Once that is determined, will want to determine how many moles of -OH was reacted after the reaction.

Number of moles of OH groups in 1g PVOH: MW of repeating polyvinyl alcohol unit [C2H3OH]: 44.06g/mol

Polyvinyl alcohol repeating unit picture

 1gPVOH(1mol PVOH unit/44.06g) x (1mol OH/1mol PVOH unit)= 0.022696 mol OH/g 

Dye attachment calculations:

  • Want to react .01% of the OH groups with the dye

MW 5-DTAF dye: 495.28g/mol

 (0.0227mol OH/g) x (.0001)= 2.27x10-6 moles dye


  2.27x10-6 moles dye x(495.28g dye/1mol dye)=0.001124g dye


Personal tools