CHRISTMAS ShrInky DInks - Homeschool 101 · 2018-12-12 · The plastic you used to make your...
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ShrInky DInks Science Activity CHRISTMAS
Transcript of CHRISTMAS ShrInky DInks - Homeschool 101 · 2018-12-12 · The plastic you used to make your...
ShrInky DInksScience Activity
CHRISTMAS
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ShrInky DInksScience Activity
CHRISTMAS
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You will need: z #6 recycled plastic – typically cookie/cupcake containers from grocery bakery departments or plastic lids from disposable cooking tins found in dollar stores.
z Scissors z Sandpaper z Coloring materials – markers, paint, colored pencils…
z Cookie sheet lined with tin foil. z Oven preheated to 375°F
You will do:1. Carefully cut out the flat plastic areas from your #6 plastic containers.
2. Gently sand one side of the plastic to make the surface rough so that your colors will hold.
3. Use the provided templates (or create your own) to outline images you choose.
4. Color in your picture and if you choose, cut around its edges. You can use: Markers, highlighters, permanent markers Paint Colored pencils
5. Bake your shrinky dink at 375°F for about 1 minute until it curls up, shrinks, and then becomes flat again.
6. Carefully remove your design and enjoy!
ShrInky DInksMakIng
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In order to understand how shrinky dinks shrink, you have to learn a little bit about polymers. What is a polymer? Well, let’s break down the word into its Greek part “poly” which means many. Many what? Well plastics are many monomers (from the Greek “mono” which means one and “mer” which means unit). Many monomers that repeat to form a larger unit are called a polymer. Essentially polymers are long chains of repeating molecules.
Why does the plastic shrink? The plastic you used to make your shrinky dink was polystyrene. It’s the plastic used to make the clear plastic lids you see in just about every place that has take-out food, like grocery stores, bakeries, and cafeterias.
It’s important that you choose the right kind of plastic when you make your shrinky dink because different plastics react differently. As you know, at room temperature, the plastic was flimsy and clear; when you warmed the plastic in the oven, however, it melted in a special way.
Manufacturers create the polystyrene in a warm stretching process that creates thin sheets and then the sheets are quickly cooled, and the plastic is essentially frozen into place. And while it will stay in that form at room temperature, a little bit of heat frees the polystyrene to return to its original thicker (and more compact) version. This is why you were told to use #6 recyclable plastic – polystyrene. Not all plastics shrink evenly. The #6 plastic remembers its original shape and can return to it when heated.
Of ShrInky DInksThe ScIence
