The structure of methyl methacrylate is given in Table 23.12. Draw the structure of a polymethyl methacrylate (PMMA) polymer that has four monomer units. (PMMA has excellent optical properties and is used to make hard contact lenses.)

Data given in Table 23.12

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TABLE 23.12 Ethylene Derivatives That Undergo Addition Formula H H H H H H H H H H H H H H H H H CH₂ H H CN H H 0-C-CH₂ 0 CH₂ C-O-CH₂ F Monomer Common Name Ethylene Propylene Vinyl chloride Acrylonitrile Styrene Vinyl acetate Methyl methacrylate Tetrafluoroethylene Polymer Name (Trade Names) Polyethylene (polythene) Polypropylene (Vectra, Herculon) Polyvinyl chloride (PVC) Polyacrylonitrile (Orlon, Acrilan) Polystyrene (Styrofoam, Styron) Polyvinyl acetate (PVA) Polymethyl methacrylate (Plexiglas, Lucite) Polytetrafluoroethylene (Teflon) Uses Squeeze bottles, bags, films, toys and molded objects, electric insulation Bottles, films, indoor- outdoor carpets Floor tile, raincoats, pipe Rugs, fabrics Food and drink coolers, building material, insulation Latex paint, adhesives, textile coatings High-quality transparent objects, latex paints, contact lenses Gaskets, insulation, bearings, pan coatings