“Plexiglass” (also called Lucite) is widely used for lenses and transparent panels because of its clarity. Chemically, plexiglass is which polymer?

Introduction / Context:
Plexiglass and Lucite are trade names commonly associated with transparent thermoplastics used in glazing and optics. Correctly mapping trade names to chemical families prevents selection errors in design and processing.

Given Data / Assumptions:

• Plexiglass/Lucite = PMMA.
• PMMA offers excellent optical clarity and good weatherability.
• Other transparent plastics (PC, PS) exist but differ in properties and trade names.

Concept / Approach:
Identify the iconic association: plexiglass → PMMA. While polycarbonate is also clear and tough, it is not “plexiglass.” PTFE is opaque and used for non-stick or chemical service; phenolics are thermosets and opaque in typical grades; PS is clear but not marketed as plexiglass.

Step-by-Step Solution:
Match trade name to chemistry: plexiglass/Lucite → PMMA.Exclude other polymers by property/tradename mismatches.Select PMMA.

Verification / Alternative check:
Supplier literature consistently lists PMMA as acrylic (plexiglass/Lucite/Perspex).

Why Other Options Are Wrong:
PTFE: fluoropolymer, not optically clear sheets.PC: another clear plastic, but not plexiglass branding.Phenolic: thermoset, opaque.PS: clear but brittle, different use cases.

Common Pitfalls:
Confusing PMMA with PC due to both being transparent; trade names differ.

Final Answer:
Polymethyl methacrylate (PMMA)