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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