I love science museums. And, I can honestly say that I have never been to a museum and left without learning something fun and new. I didn’t expect to learn this from the Science Museum of Western Virginia, but I did.
How to make your own bouncy ball!
1 tablespoon Elmer’s Glue
1/2 teaspoon borax
1 tablespoon cornstarch
2 tablespoons warm water
2 disposable plastic cups
2 popsicle sticks
food coloring
rubber gloves
Instructions
1. Use a popsicle stick to mix the glue with food coloring in one of the disposable plastic cups.
2. Use the other popsicle stick to mix the water with the borax in the other cup. Stir until the borax has dissolved.
3. Add 1/2 teaspoon of borax water to the glue mixture. Add cornstarch. Wait 15 seconds.
4. Stir the mixture together until it stiffens. Put on the rubber gloves and mold the ball until it becomes a solid.
What’s Happening?
The white glue contains polyvinyl acetate, a strong and flexible polymer that gives the ball strength. Cornstarch contains amylopectin, a polymer whose shape is best described as “branched” - it sticks out like the branches of a tree - and gives the ball the property of elasticity. Elasticity allows the ball to return to its original shape after being compressed or stretched, such as hitting the floor. So instead of splattering everywhere, the ball bounces back up. The borax is needed to help the glue and the starch stick together. This connects the two polymers into a netlike formation, keeping the ball from crumbling or becoming slime when it is bounced.
Important-
-Store your homemade bouncy ball in a bag or other airtight container so it won’t dry out.
-Borax is considered poisonous and should not be ingested or directly inhaled. Supervise children around borax and store in a safe place.
















