This compound is the nonpolar half of the amphi·pathic co·polymer that stabilizes membrane proteins in lipid nanodiscs. This monomer strengthens the most common class of thermo·plastic elasto·mers, which are named for it. Sulfonated polymers of this compound make up ion exchange resins. A bead made from a polymer of this compound is the “solid phase” used in peptide synthesis. (-5[1])Emulsion polymerizations were invented to stop runaway reactions of this aromatic compound during industrial rubber production. This compound is the heaviest monomer in a filament used for high-temperature 3D printing that also contains acrylo·nitrile and buta·diene. This compound, which is a vinyl group attached to benzene, is the monomer of the very common plastic insulator used in iso·baric calorimeters. For 10 points, name this compound that is polymerized into lightweight packaging and a commercial “foam.” ■END■ (10[1])