Safer and Greener Polymer Demonstrations for STEM Outreach

Abstract

Polymer demonstrations have become increasingly important within science, technology, engineering, and math education curricula. These demonstrations not only afford the opportunity to introduce students to polymers but also provide an avenue to educate students about the impact polymers have on the planet. Despite the educational value and recreational enjoyment polymer demonstrations can provide, there are serious health and environmental hazards associated with some of the historically common polymer demonstrations that should be addressed. This Perspective describes the benefits and consequences of the historically common polymer "slime" and "silly putty" demonstrations and then details alternatives that can replace them. Finally, a Methods section of healthier and safer polymer demonstrations with detailed protocols is included.

Figure 1

(a) Reaction mechanism for Borax Slime (Adapted with permission from ref (18). Copyright 2015 John Wiley and Sons). (b) An image of Borax Slime dyed green.

Figure 2

(a) The basic scheme for Alginate Slime formation (Adapted with permission from ref (36). Copyright 2019 American Chemical Society). (b) Picture of Alginate Slime dyed pink.

Figure 3

Oobleck slime.

Figure 4

Making Gummy Candy Slime.

Figure 5

Making Marshmallow Slime.

Figure 6

Gummy Bear Osmosis demonstration.

Figure 7

Making Homemade Glue.