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Objective
Description
Part A
- Dynamic Mechanical Analyzer was used to find out the stiffness and flexibility of each films.(width 5.3 mm)
- DMA of 22,000 film was measured.(without crosslinking)
- DMA of 100,000 film wihout cross-linking will be done next week.
- Following films were cross-linking(kept at 120C for 90min) for DMA.
- 100,000 PVOH
- 22,000 PVOH
- 100,000 PVOH with a drop of HCL
- 22,000 PVOH with H3Po4 and maleic acid
- 22,000 PVOH with H3Po4 with H3PO4.
Data
- After the cross-linking, films became stiffer and their color was not clear as before.
- After the cross-linking, film of 100,000 became dark black.
- DME result for PVOH(required)
Individual observations of films after
Films
- 22,000 PVOH: less clear film. Slight change in stiffness.
- 22,000 PVOH with H3PO4 and maleic acid : less clear film. Slight change in stiffness.
- 22,000 PVOH with H3PO4: yellowish color, stiffness increased dramatically. It can be still bended.
- 100,000 PVOH: less clear film. Very stiff. Harder to bend.
- 100,000 PVOH with HCl: Dark Black color. still flexible. Stiffness did not change to much.
Notes
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Experimental Chemistry
