Get the free Experiment 26F PREPARATION AND RECYCLING OF LINEAR ... - usna

Experiment 26F FM 1/8/08 PREPARATION AND RECYCLING OF LINEAR AND CROSS-LINKED POLYMERS MATERIALS: Resorcinol, 3 M NaOH, formalin, ophthalmic anhydride, anhydrous sodium acetate, ethylene glycol, Nylon

Procedure: The mixture was incubated at 37 °C for 1 hour. Then the pH of the resulting solution was adjusted to 4.2. After the addition of 50 mL methanol, the mixture was treated with 10 mL methanol to remove NaCl. After a further 20 minutes, the mixture was treated with 10 mL methanol again, and the product was extracted by evaporation to yield a solid. The solid was washed with 5 mL warm distilled water, and the white precipitated layer was taken up in an aqueous-alcohol solution of 1 g/L of NaOH and diluted with 1 mL acetonitrile; the sample was then treated with 5 mL acetonitrile to yield a mixture containing a small amount of methanol and the final organic layer was dried. The solvent was removed by crystallizing by heat, and the resulting pellet was treated with 5 mL cold ethanol to wash away the alcohol, and the sample was dried. The combined solid and the residue were washed with five times 10 mL 70% ethanol and the final methanol sample was extracted with 3 mL 20% formic acid. Then the residue was treated with five times 5 mL 20% formic acid from the residue, dried on a slow fire for an additional 30 minutes, and the solid was collected, and the filtrate was concentrated to give a residue containing 20% of the original polymer (1.6 g/L). The resulting filtrate was washed with 5 mL 5X 50% methanol and the filtrate was dissolved in 10 mL water, the residue was filtered and the organic layer was washed with 500 SL 100% ethanol and the residue was concentrated to yield a residue containing 20% of the original polymer (1.6 g/L). The combined solid and the residue were washed with five times 10 mL 70% ethanol and the final methanol sample was filtered and the solid was dried. The filtrate was concentrated to give a residue containing 2.4 g/L of resorcinol.

For pdfFiller’s FAQs

Where do I find experiment 26f preparation and?

It's simple using pdfFiller, an online document management tool. Use our huge online form collection (over 25M fillable forms) to quickly discover the experiment 26f preparation and. Open it immediately and start altering it with sophisticated capabilities.

How do I execute experiment 26f preparation and online?

pdfFiller has made it simple to fill out and eSign experiment 26f preparation and. The application has capabilities that allow you to modify and rearrange PDF content, add fillable fields, and eSign the document. Begin a free trial to discover all of the features of pdfFiller, the best document editing solution.

How do I fill out experiment 26f preparation and using my mobile device?

The pdfFiller mobile app makes it simple to design and fill out legal paperwork. Complete and sign experiment 26f preparation and and other papers using the app. Visit pdfFiller's website to learn more about the PDF editor's features.