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Time for Slime!

Time for Slime!. Making a cross-linked polymer. Make a polymer!. Use polyvinyl alcohol (PVA) This is a repeating monomer of vinyl alcohol . Add a few drops of boric acid solution. This acts as a cross-linker Formula is Na 2 B 4 O 7 + 10H 2 O Boric acid forms borate ion in water:.

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Time for Slime!

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  1. Time for Slime! Making a cross-linked polymer

  2. Make a polymer! • Use polyvinyl alcohol (PVA) • This is a repeating monomer of vinyl alcohol

  3. Add a few drops of boric acid solution • This acts as a cross-linker • Formula is Na2B4O7 + 10H2O • Boric acid forms borate ion in water:

  4. Mix together, and……. • Borate ion forms cross-links with the OH in PVA

  5. Play with the slime and answer these: 1. List 3 physical characteristics of your polymer. • Roll some of the mixture up into a ball and set it on the table. What does it do? • What happens to it when it is slowly pulled? • How does it react when it is sharply pulled? 5. Does it bounce? Does it stretch? Can it shatter? 6. A fluid is anything that flows (air, liquids, etc.) Is this polymer a fluid? Why/why not? 7. Did you make a thermoplastic polymer or a thermoset polymer? How do you know? 8. Has a physical or chemical change occurred? Explain…..

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