9.5
One way to differentiate between polymers is to look at their functional groups - distinctive arrangements of atoms that impart characteristic chemical properties to the molecules that contain them.
9.5
Condensation Polymers
Examples Natural: starch, wool, silk, proteinsSynthetic: nylon, kevlar, and ABS
Formation of PET
9.7
Composition of municipal solid waste:
100 billion pounds of plastic is produced in the U.S. each year- much of this ends up in landfills.
Recycling
9.8
Example of closed loop recycling
Ever heard of aluminum dross?
Recycling
9.8
Aluminum dross is a by-product of the primary and secondary aluminum industries
White drossBlack drossSalt cake
None are on the EPAs Hazardous Materials List
So in the U.S. it has been co-disposed along side of municipal solid waste for many years. Two Billion Tons are buried each year.
Al skimming toolScrap + white dross
Recycling: Al
9.8
Aluminum dross
“Mount Rumke” before “Mount Rumke” after dross exposure to water
Recycling: Al
9.8
Aluminum dross
Fe2O3 (or sometimes Fe3O4) + Al → Al2O3 + molten iron (Fe) + A LOT OF HEAT
2 Al + 6 H2O → 2 Al(OH)3 + 3 H2 + heat
AlN + 3 H2O → Al(OH)3 + NH3
The chemistry behind the troubles
Top Related