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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.
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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
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