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Super Absorbent Project

Super Absorbent Project. Sean Spivey. Background/Intro. A SAP is a polymer than can absorb large amounts of water SAP’s are usually made of sodium polyacrylate

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Super Absorbent Project

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  1. Super Absorbent Project Sean Spivey

  2. Background/Intro • A SAP is a polymer than can absorb large amounts of water • SAP’s are usually made of sodium polyacrylate • Biodegradable superabsorbent hydrogels derived from cellulose by esterification crosslinking with 1,2,3,4-butanetetracarboxylic dianhydride

  3. Intro • Why Glycerol? • Cheap • Higher Ion density (~2-3 ions/molecule) • Green • Less or no acrylic used (than acrylic SAP)

  4. Chemistry

  5. Chemistry

  6. Procedure (First) • Glycerol Oxalic • Why we started with it • Pka • Cost • Why it doesn’t work • When heated, glycerol and oxalic form a complex that ends up forming CO2, resulting in large losses • What’s next • Switching to succinic anhydride to make R>1

  7. Procedure (Second) • Glycerol & Succinic • Why we chose it • Availability & cost • Why straight succinic isn’t the best option • Slow reaction time • Controlling poly condensation • What’s next (Anhydride)

  8. Procedure (Final?) • Use succinic anhydride and maleic anhydride • Why • Faster reaction • Less free radical auto-polymerization • Simple process • No/limited water generation

  9. Results A C B B D A A D B D B B C A D D D

  10. Results B C B A D A A C A D A B C C

  11. Conclusion • What we want to work on over the summer • Get a product • Test the product against other SAP’s

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