User:Allison K. Alix/Notebook/CHEM-581/2012/10/03: Difference between revisions

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width: 0.22mm.  
width: 0.22mm.  


The films that were cross-linked in the oven had some considerable changes in color and toughness. MW 100,000: film became much tougher, no visible color changes. MW 22000: no toughness or color changes. MW 22000 w/ phosphoric acid: film became much tougher and turned a slight yellowish brown color. MW 22000 with phosphoric acid and maleic acid: no changes in toughness or color. MW: 100,000 w/ hydrochloric acid: toughness did not change but color became a very dark black
The films that were cross-linked in the oven had some considerable changes in color and toughness:
 
*MW 100,000: film became much tougher, no visible color changes.  
*MW 22000: no toughness or color changes.  
*MW 22000 w/ phosphoric acid: film became much tougher and turned a slight yellowish brown color.  
*MW 22000 with phosphoric acid and maleic acid: no changes in toughness or color.  
*MW: 100,000 w/ hydrochloric acid: toughness did not change but color became a very dark black


==Notes==
==Notes==

Revision as of 10:52, 5 October 2012

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Objective

Dynamic Mechanical Analysis of PVOH films

Description

Dimensional Mechanical Analysis (DMA) will be performed on previously synthesized PVOH films consisting of the following:

1) MW: 22000

2) MW: 100000

3) MW: 22000 with phosphoric acid

4) MW: 100000 with hydrochloric acid

5) MW: 22000 with phosphoric acid and maleic acid.

Samples 3-5 were crosslinked via dehydration in the oven at 120°C for 90 minutes. Samples of films 1 and 2 were also cross linked via dehydration for a before and after comparison of crosslinking.

Data

PVOH MW: 22000

height: 20.49mm

width: 0.22mm.

The films that were cross-linked in the oven had some considerable changes in color and toughness:

  • MW 100,000: film became much tougher, no visible color changes.
  • MW 22000: no toughness or color changes.
  • MW 22000 w/ phosphoric acid: film became much tougher and turned a slight yellowish brown color.
  • MW 22000 with phosphoric acid and maleic acid: no changes in toughness or color.
  • MW: 100,000 w/ hydrochloric acid: toughness did not change but color became a very dark black

Notes

A non-cross linked sample of film 1 will have to be re-analyzed as the length was entered as 3.5mm instead of 5.3mm



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