Polycaprolactam identification: this polymer is more commonly known by which nylon designation?

Introduction / Context:
Nylon naming can be based on carbon counts of monomers or on a ring-opening process. Polycaprolactam derives from the ring-opening polymerisation of caprolactam (six-membered ring).

Given Data / Assumptions:

• Caprolactam → polycaprolactam → nylon-6.
• Nylon-66 requires a diamine and a diacid (HMDA + adipic acid).

Concept / Approach:
Nylon-6 has repeating amide linkages formed by ring-opening of a single monomer, distinct from the two-monomer condensation of nylon-66.

Step-by-Step Solution:
Recognise polycaprolactam's origin.Map to common designation: nylon-6.

Verification / Alternative check:
Standards and datasheets use nylon-6 interchangeably with polycaprolactam.

Why Other Options Are Wrong:
Nylon-66 and PTFE/Teflon and SBR are different polymers.

Common Pitfalls:
Confusing nylon-6 and nylon-66 due to similar numbering.

Final Answer:
Nylon-6