Search your home for two plastics containing the recycling symbols from Figure 1

Question

Search your home for two plastics containing the recycling symbols from Figure 1. Indicate the item, full name of the polymer, draw its structure, and list the characteristic IR bands for each. Examples with the #7 symbol are “mixed plastics.” Find examples with codes 1-6.

ers Made by Chain-Reactions Repeating Unit Table 1. Common P Name High-density polyethylene (HDPE) Monomer Applications Milk jugs, insulation, nsity Packaging film, insulation, flexible bottles Appliances, car parts polyethylene (LDPE) Polypropylene (PP) H CH3 y(vinylchloride) (PVC or V) oor covering H C H CI Cl Poly(vinylidene chloride) (Saran) Packaging film Cl ytetrafluoroethylene (PTFE or Teflon) Nonstick coating stopcocks cis-1,4-polyisoprene Tires, shoes equipment Poly (methyl methacrylate) (PMMA) Display signs, plexiglass dentures CH2 Packaging drinking cups Polystyrene (PS)

Explanation / Answer

Items recyclable,

1) Plastic carry Bag ; High density Polyethylene

Structure : -(-CH2-CH2-)n-

IR bands : 2850-2950 cm-1 for aliphatic C-H stretch

1350-1500 cm-1 C-H stretch bands

2) Carry out food container ; polystyrene

Structure : -(-CH(Ph)-CH2-)n-

IR bands : 2850-2950 cm-1 for aliphatic C-H stretch

3000-3100 cm-1 for sp2 =C-H stretch

1450-1550 cm-1 C=C stretch

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