User:Mobeen Ashraf/Notebook/Chem-581/2012/09/07

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(Objective)
Current revision (15:34, 26 September 2012) (view source)
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==Notes==
==Notes==
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This area is for any observations or conclusions that you would like to note.
 
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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.
 
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[[Category:Course]]
 
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[[Category:Miscellaneous]]
 
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Heating PVOH in presence of a cross linker, promotes cross-linking. Heat imparts and induces high degree of cross linking. Fully cross-linked films are not soluble in water solution and are durable as well as heat resistant.
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Objective

Solubility Test for Cross-linked and Not Cross-Linked PVOH Films

Description

Solubility Test for Non Cross-Linked and Cross Linked PVOH Films.

Three films of PVOH were made and were labelled as A, B, and C. A contains .5 g PVOH, MW of 22,000 in 5 ml of water. B contains 0.5 g PVOH, MW of 22,000, in 5 ml of water and phosphoric acid. C contains 0.5 g PVOH, MW of 22,000 in 5 ml of water, maleic acid, and phosphoric acid.

We also prepared thin films of 0.1 g PVOH, having the molar masses of 22,000 and 100,000.

Cross linking of the films were done by heating films into the oven set up at a temperature of 120 degree Celsius for 90 mins.

Solubility Test with out Heating (dry films): 0.1014 g of A, starting time: 1:45 pm, ending time: 2:17 pm > Completely Soluble 0.1000 g of B, starting time: 1:20 pm, ending time: 1:45 pm > Completely Soluble 0.1051 g of C, starting time: 2:17 pm, ending time: 2:35 pm > Completely Soluble

Solubility Test with the Oven Films (Cross-Linked): 0.1 g of A, starting time: 2:35 pm, ending time: 3:00 pm > completely soluble 0.1 g of B, starting time: 3:00 pm, ending time: 3:30 pm > completely soluble 0.1 g of C, starting time: 3:00 pm, ending time: 3:30 pm > not dissolved, insoluble

Data

  • Add data and results here...

Notes

Heating PVOH in presence of a cross linker, promotes cross-linking. Heat imparts and induces high degree of cross linking. Fully cross-linked films are not soluble in water solution and are durable as well as heat resistant.


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