POLYPROPYLENE!. One Popular Polymer!. What’s so great about POLYPROPYLENE?. High Melting Point (dishwasher safe!) Intermediate crystallinity: tough without being brittle High resistance to fatigue (living hinge) Chemically Inert CHEAP to MAKE!!!. Polypropylene comes from Propylene!.
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One Popular Polymer!
1. Zeigler-Natta polymerization:
TiCl3 + Al(C2H5)2Cl, or TiCl4 + Al(C2H5)3
2) Kaminsky Catalysts: Metallocene
A metallocene is a
positively charged metal ion sandwiched between two negatively charged cyclopentadienyl anions.
Courtesy of Mr. Hogan and Mr. Banks
Polypropylene is Useful. . .
PP generation in 1996 (tons)
Source: EPA, Characterization of Municipal Solid Waste in the United States: 1997 Update
* Includes plastics in disposable diapers, clothing, footwear, etc.
** Other plastics packaging includes coatings, closures, caps, trays, shapes, etc.
“Plastics numbered 3-7 have very limited markets, and the cost to separate and ship these small volume plastics is in excess of $12,000 per month.” - Madison pride recycling program Madison, WI
The only way to get rid of it is to burn it.
Roughly 25,000 tons were recycled in 1996