Write reactions involved during preparation of Nylon 6, 6 fibre.
Q.3 Write reactions involved during preparation of Nylon 6, 6 fibre.
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Answer: Nylon 6,6 is made by condensation polymerisation of adipic acid with hexamethylenediamine.
Step 1 (nylon salt): n HOOC–(CH2)4–COOH + n H2N–(CH2)6–NH2 → n [–OOC–(CH2)4–COO–][H3N+–(CH2)6–N+H3] (hexamethylenediammonium adipate)
Step 2 (polymerisation): on heating to about 553 K under high pressure, water is eliminated:
n HOOC(CH2)4COOH + n H2N(CH2)6NH2 \(\xrightarrow{553\ \text{K, high pressure}}\) –[–OC–(CH2)4–CO–NH–(CH2)6–NH–]–n + 2n H2O
The molten polymer is extruded and drawn into fibres.
Doubtly AI
· 28 Oct 2026
AI-verified · Oct 2026
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