Bob the Bouncing Blob

You don’t have to name your blob Bob. It might be more of a Bill, or a Babette.

WHAT YOU NEED: paper towels, 2 small plastic cups, measuring spoons, white craft glue, Epsom salt, warm water, plastic spoon, Ziploc bag

WHAT TO DO:

  1. Cover your work surface with two layers of paper towels. 
  2. Put 1 tablespoon of glue into one cup.
  3. Put 1/2 teaspoon of Epsom salt and 1/2 teaspoon of water in the other cup and dissolve that solution. It’s okay if all the Epsom salt didn’t dissolve.
  4. Pour the solution into the cup of glue. Stir.
  5. Do you notice a change in the solution? Grab the glob you’ve made and pile it on your paper towel-covered work surface. 
  6. Fold the towels over the glob and gently press the extra water out of it. Now discard the paper towels.
  7. Store your blob in a resealable plastic Ziploc bag. (Never pour a polymer concoction down the drain. If you need to discard it, put it in the trash).

WHAT HAPPENS: You’ve made a blob that you can bend, twist, squeeze, smoosh, roll, and bounce.

WHY IT WORKS: Glue remains a compound while making things stick together because it contains polyvinyl alcohol. That acts as a binder, keeping the glue semi-liquid and less likely to dry out. This makes glue perfect for making a polymer. The glue cross-links with the dissolved Epsom salt to create strong, flexible chains of molecules – which are a characteristic of polymers. Roll them into a ball and they bounce!

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Posted on April 27, 2013, in Uncategorized. Bookmark the permalink. Leave a comment.

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