Question

Mention the important properties of nylon-66.

Answer 1

1. Nylon‑66 is a semi‑crystalline polyamide with strong interchain hydrogen bonding, giving high tensile strength and toughness.
2. It has a high melting point (about 260-265°C) and good thermal stability.
3. The polymer shows excellent abrasion and wear resistance, so it is used for fibers and engineering parts.
4. Density is moderate (~1.14 g cm⁻³), and the material is fairly stiff.
5. Nylon‑66 is hygroscopic; absorbed moisture lowers stiffness but increases toughness.
6. It resists oils and many organic solvents but is attacked by strong acids and oxidizers.
7. It is readily processed by melt spinning and molding, and accepts dyes well.