User:Moira M. Esson/Notebook/CHEM-581/2012/11/14

< User:Moira M. Esson | Notebook | CHEM-581 | 2012 | 11(Difference between revisions)

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General Protocol

Cut PVOH film in half. Place each half in a 100mL beaker. There will be two beakers used for each film.
Fill one beaker with ~50mL 20ppm CuSO₄ stock solution. Make sure enough solution is used to completely cover the film.
Fill the second beaker with ~50mL 20ppm NaSO₄ stock solution. Make sure enough solution is used to completely cover the film.
Allow the films to sit for ~48hours

Notes:

The films that were used were PVOH(MW 22K)+0.8wt% GA crosslinked and PVOH(MW 22K)+0.8wt% GA+NaMT crosslinked

The general protocol for acetylation described 2012/11/09 was used.
Three reaction mixtures(20%, 40% and 60%) were placed on a stir plate for 1 hour.

Note:

Three drops of bromothymol blue were added to each reaction mixture before titrating with sodium bicarbonate solution prepared 2012/11/09
PHP solution had not completely dissolved. Standardization of sodium bicarbonate must still be performed. In order to facilitate the dissolving of PHP, 20.424g of PHP will be remeasured, dried and divided three equivalent portions. These equivalent portions will be added to three separate beakers and deionized H₂O will be added to the beakers to create a 1M solution.

Titration results:

@@ Line 31: / Line 31: @@
 | align="center" style="background:#f0f0f0;"|'''Total volume used(mL)'''
 |-
-| 20%||||||
+| 20%||0.5||42.5||42
 |-
-| 40%||||||
+| 40%||0.0||43.2||43.2
 |-
-| 60%||||||
+| 60%||0.1||42.8||42.7
 |}