Polymers and Composites

Balloon

Poly = Many A large, complex molecule built from

smaller molecules joined together in repeating patterns

Polymer

Synthetic◦ Polyester◦ Nylon◦ Plastics

Natural◦ Starches◦ Meat proteins◦ Egg proteins

Examples

Mostly carbon compounds 2 properties allow this

◦ Can form 4 bonds (gains, loses, share 4 electrons)◦ Make a variety of structures

Forming Polymers

Straight chain Branched chain Ring

Types of Structures

Most common is H O N P S Halogens

Carbon’s Friends

Mono = 1 These are the smaller molecules that repeat

to build the polymers

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

Monomers

Paper Clips

Cellulose: cell walls of fruits and veggies. Starches: Sugar molecules Silk: Silk worm cocoons Wool: Sheep’s fur Figure Nails and muscles: proteins

◦ Amino acids

Natural Polymers

Raw mats = coal or oil Plastics Carpet Clothing Glue Gum (do not swallow) Pg 121

Synthetic Polymers

Synthetic = cheaper, lasts longer Natural = environmentally friendly

Comparing Polymers

Combine 2 or more substances in a new material with different properties

Many include 1 or more polymers

Composites

Fiberglass Flexible but strong!

◦ Fishing polls◦ Tennis rackets

Composite Uses

Plastics can last forever but some are only used for a day

Recycling Money Island of plastic

Too Much