User:Allison K. Alix/Notebook/CHEM-581/2012/10/03
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Dynamic Mechanical Analysis of PVOH films
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.
PVOH MW: 22000
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
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