User:Mobeen Ashraf/Notebook/Chem-581/2012/10/03

Objective

DMA- Dynamic Mechanical Analysis on PVOH films

Description

Following PVOH Films were Cross-linked:

• 1) PVOH film, MW of 22,000-placed in an oven set at 120 deg Celsius for 90 mins.
• 2) PVOH film, MW of 100,000-placed in an oven set at 120 deg Celsius for 90 mins.
• 3) PVOH film, MW of 100,000 cross-linked with HCl-placed in an oven set at 120 deg Celsius for 90 mins.
• 4) PVOH film, MW of 22,000, cross-linked H3PO4-placed in an oven set at 120 deg Celsius for 90 mins.
• 5) PVOH film, MW of 22,000, cross-linked with maleic acid and H3PO4-placed in an oven set at 120 deg Celsius for 90 mins.

DMA Analysis:

PVOH films were subject to stretch( elastic tension ) mechanical analysis to test its mechanical durability.

• PVOH (film 1) was selected for DMA analysis. By using vernier calipers, the height and width of the film was measured to be 20.49 mm and 0.22 mm respectively.

Data

• Add data and results here...

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

   * PVOH MW 100,000- film was firmer and there was no apparent color change.
   * PVOH MW 22000- no apparent color and physical change that was observed.
   * PVOH MW 22000 cross linked with H3PO4- film became much tougher and turned a slight yellowish brown color.
   * PVOH MW 22000 with H3PO4 and maleic acid- no apparent color and physical change that was observed.
   * PVOH MW 100,000 cross-linked w/ hydrochloric acid- slightly firm, but color change was very prominent- dark, jet blackish.

Notes

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