Which term describes a class of polymers formed from diisocyanates and polyols?

• A. Glass
• B. Nylon
• C. Rubber
• D. Urethane

Answer: (D)

Polymers formed from diisocyanates and polyols are polyurethanes, a versatile class of polymers. The diisocyanate provides reactive isocyanate groups while the polyol supplies multiple hydroxyl groups; when they react, a urethane linkage (–NH–CO–O–) is formed, linking building blocks into long chains and networks. This combination yields materials that can be tailored to be flexible foams, rigid foams, coatings, or strong adhesives.

In automotive glazing, polyurethane adhesives are favored because they bond well to glass and metal, offer good elasticity to handle stresses and temperature changes, and resist moisture and weathering. That precision in naming—polyurethanes—clearly describes the polymer class created from diisocyanates and polyols, setting it apart from other materials like glass, nylon, or rubber.