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molecule
monomer
polymer
moleculemolecule molecule
monomer
polymer
What is a
polymer?
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Milk Vinegar Casein plastic
+
Casein spheres Unfolded casein chains
Turn milk into plastic
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Materials you need
Students• Work surface that is safe to get damp• Prepared hot milk• Heat-‐resistant cup• Prepared vinegar• Paper towels • Spoon • Optional: food coloring, glitter, or markers
Teacher• Measuring cup • Milk • Stovetop oven or microwave • Microwaveable container • Thermos • White vinegar
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Add hot milk to vinegar
• Measure out 1 cup of milk with the help of your teacher
• Add milk to the prepared cup with vinegar
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Stir milk-‐vinegar mixture
• Mix the hot milk and vinegar with a spoon for a few seconds
What happens to the milk?
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Scoop out the solid curds
Four layers of paper towels
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• Fold paper towel stack over the curds and press down on them
• Use two more paper towels to press down on top of the curds
Remove excess liquid
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Knead the curd with your hands
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Mold and shape the milk plastic
• Knead the polymer well before shaping
• Optional: use food color, glitter or markers to decorate your products
• Let your milk plastic objects dry on a paper towel for about 48 hours