Polymer Journal 4

Polymer Project Journal 4

Cecilia Johanna

Leo

Last class before the end of class, we made one Polymer with corn starch in it to see. However, because of the time we didn’t mix it well and after we put the polymer in the fridge it turned out like this.

Out of curiosity, we microwaved it to see if it’ll still work. So we microwaved it for 20 seconds, just as we expected, we turned soft but the outer layer is still hard. But this proved that the polymer can still be working, if we mix it well.

After this, we decided to add cornstarch into the polymer. We used 4 cm of glue, 28 ml of water, 30ml of Borax, one small sized spoon of corn starch and mixed it as best as we can. After the polymer is not sticky anymore, we coded the polymer in cornstarch to make it more stretchy. Now our hand warmer is done.

Not only hand warmers, out group also decided to make hand coolers. We used the same ingredients but with more borax. During the experiments we discovered that the borax and contain a lot of heat and cold, but it melts when there’s too much heat, so for the hand coolers we used more Borax to make it more effective.