In elastomer nomenclature, the commercial name “Neoprene” corresponds to which specific polymer type?

Introduction / Context:
Trade names often obscure the underlying polymer chemistry. For design and materials selection, it is critical to link commercial names to their real polymer identity and performance envelope. Neoprene is a classic case frequently encountered in seals, hoses, and protective apparel.

Given Data / Assumptions:

• Neoprene is a long-established elastomer brand name.
• Typical applications include wetsuits, belts, hoses, and vibration mounts.
• Need to map the brand to the polymer backbone and repeating unit.

Concept / Approach:

Neoprene is polychloroprene, obtained by polymerization of chloroprene (2-chloro-1,3-butadiene). The chlorinated backbone imparts oil and weathering resistance superior to many non-polar rubbers, with useful flame resistance and good mechanical strength, distinguishing it from SBR, polyurethane elastomers, or thermoset phenolics.

Step-by-Step Solution:

Verification / Alternative check:

Materials databases and rubber handbooks consistently equate Neoprene to polychloroprene (CR), confirming the identity.

Why Other Options Are Wrong:

Polyurethane: Different chemistry and uses. Phenol–formaldehyde: A thermoset resin, not an elastomer. SBR: Copolymer of styrene and butadiene; lacks chlorine and different performance profile.

Common Pitfalls:

Equating all black rubbers visually; relying on trade names without confirming polymer chemistry.

Final Answer:

Polychloroprene