Notes 7-3

Forming Polymers

• Polymers form when chemical bonds link large numbers of monomers in a repeating pattern.

Monomers are the building blocks of polymers.

Mono = OnePoly = Many

Natural Polymers

• Proteins (monomer = Amino acids)– Examples: proteins carry O2 in blood, hair, nails,

proteins in snake venom• Carbohydrates (monomer = sugar)– Starches, cellulose

• DNA (monomer = nucleotides)• Spider webs• Silk• Wool

Synthetic Polymers

• Man-made• Plastics• Many types of clothing• Carpet• Gum• Toothpaste• Styrofoam• Nylon

Polymers video clip

• http://youtu.be/8YUiRKWPKl8

Composites

• Combines 2 or more substances in a new material with different properties

• Often involves one or more polymers• Example: Wood is a composite of 2 polymers,

cellulose and lignin• Example: Ancient bricks were composites of

straw and mud

Video Notes- Composites

• 20 facts• http://youtu.be/tZhH2B-EI1I