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Sno-Camp Polymer Chemistry
Advantages of Polymers Ease of forming
Recyclable
Readily available raw material (crude oil)
Low cost (most is less than $2.00 per lbs.)
Polymers Advantage • Low (softening) “melt” temperature
Disadvantage ◦Low (softening) “melt” temperature
Most Consumer Plastics are Thermoplastics
Why you ask?: •Form with heat •Recyclable • •Low cost compared to other containers •Transparent ( see the product)
Cost of 20oz Containers PETE $0.06 Aluminum $0.07 Glass $0.10
Response to Heat Thermoplastic◦Softens or melts with heat
Thermoset◦Sets with chemical reaction
Elastomer ◦ Is elastic
Various Polymer Structures
Polyethylene
LDPE Low density polyethylene (trees with branches)
HDPE High density polyethylene (trees without branches)
Polyethylene LDPE Sandwich Wrap
◦ .92-.94 specific gravity
HDPE Milk Carton ◦ .95-.97 specific gravity
Degree of crystalline content and branches◦ Heat HDPE jug with a heat gun
Low Density Polyethylene Density of .910-.925 g/cm3
Linear low-density Polyethylene Density .915-.925 g/cm3
High-Density Polyethylene Density greater than .941
Polyethylene
Polyethylene
Polypropylene
Polyvinyl Chloride
Polystyrene
Polycarbonate
ABS (Acrylonitrile, Butadine, Styrene)
Nylon 6 – 10
Polyester
PETE
Polylactic Acid (PLA)
Major types of polymers we see every day