Making Plastic from Protein

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Presentation transcript:

Making Plastic from Protein A plastic is made from casein, the protein in milk. 9/20/2018

Purpose Using common household items such as milk and vinegar a complex polymer such as plastic can be made. 9/20/2018

Demonstration Milk was heated to almost boiling and vinegar was added. Rubbery material(casein) was drawn off and pressed into mold. The casein hardened over time and formed a plastic. 9/20/2018

Concepts 1. Biological Molecules 2. Denaturation 3. Polymers 9/20/2018

(Carbohydrates, Fats and Proteins) 9/20/2018 1. Biological Molecules (Carbohydrates, Fats and Proteins) Carbohydrates consist of carbon, hydrogen and oxygen. often sugars and starches Milk sugar - Lactose Fats consist of carbon, hydrogen and oxygen. built up in plants and animals Milk fats - stearic acid - oleic acid Proteins contain carbon, hydrogen, oxygen and nitrogen. occur in all living matter building blocks of life Milk protein - casein - albumin 9/20/2018

2. Denaturation Proteins have definite shapes and structures Altered shape « Denaturation « Loss of biological activity High temperature Cooking an egg Strong acids and bases Vinegar + Milk The vinegar caused the protein (casein) in the milk to coagulate. The casein changed shape from a liquid to a rubbery solid. 9/20/2018

3. Polymers A=B ® A-B-A-B-A-B-A-B-A-B........... Some polymers occur naturally, but the vast majority of polymers are man made. Polymers are long chains of the same small molecule repeated over and over. These long chains get tangled up like spaghetti. It is the way they get tangled up that gives plastic its strength. If the strands are held rigidly together, the result is a stiff plastic like casein. ornaments A=B ® A-B-A-B-A-B-A-B-A-B........... 9/20/2018

Conclusion The casein was denatured by the vinegar. The casein was extracted from the milk. The rubbery casein’s protein molecules bound tightly together. A hard plastic was made. 9/20/2018

9/20/2018 Comments There are now thousands of plastics and polymers and new ones are being made for everything from sports clothes to spacecraft. Plastics are so strong, light and unaffected by corrosion that they are used in virtually everything from light aircraft to artificial hips. 9/20/2018