GATE (TF) Textile 2015 Question Paper Solution | GATE/2015/TF/18

Question 18 (Textile Engineering & Fibre Science)

Adipic acid is a monomer for the production of

(A)Poly (ethylene terephthalate)
(B)Nylon 66
(C)Nylon 64
(D)Nylon 610
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How is nylon 66 manufactured?

Nylon 66 is a synthetic polymer that is widely used in the manufacture of various products, including textiles, automotive parts, electrical components, and more. The production of Nylon 66 involves the following steps:
Synthesis of adipic acid: Adipic acid is a key raw material used in the production of Nylon 66. It is synthesized by oxidizing cyclohexane with nitric acid to produce cyclohexanone and cyclohexanol, which are then oxidized further to produce adipic acid.
Synthesis of hexamethylenediamine (HMDA): HMDA is another key raw material used in the production of Nylon 66. It is synthesized by reacting 1,6-dichlorohexane with ammonia.
Polymerization: The adipic acid and HMDA are then polymerized together under heat and pressure to produce Nylon 66. The resulting polymer is then cooled, solidified, and cut into pellets or other forms for further processing.
Post-processing: The Nylon 66 pellets or other forms may undergo various post-processing steps, depending on their intended use. For example, they may be extruded into fibers for textiles, molded into shapes for automotive parts, or used as a base material for electrical components.
Overall, the production of Nylon 66 involves several complex chemical reactions and manufacturing processes, but it is a widely used and versatile material that has many applications in various industries.

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