Making a cross-linked polymer

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Presentation transcript:

Making a cross-linked polymer 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 Na2B4O7 + 10H2O Boric acid forms borate ion in water:

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

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…..