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

Experimental Chemistry

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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 This area is for any observations or conclusions that you would like to note. Use categories like tags. Change the "Course" category to the one corresponding to your course. The "Miscellaneous" tag can be used for particular experiments, as instructed by your professor. Please be sure to change or delete this tag as required so that the categories remain well organized.