Monday, February 23, 2015

Physical and Chemical properties of Nylon| End uses of Nylon

Nylon was the first man made organic textile fibre made from the raw materials from the mineral kingdom. It is a manufactured fibre in which the fibre forming substance is long chain, synthetic polyamide having recurring amide groups (-CO-NH-) as an integral part of the molecular chain.

Nylon fibre

Physical properties
  • Tenacity: 4-9 gm/den (dry), in wet 90% of dry.
  • Elasticity: Breaking extension is 20-40%.
  • Stiffness: 20-40 gm/den.
  • Moisture regain: 3.5-5%; (not absorbent due to crystallinity).
  • Specific gravity: 1.14.
  • Abrasion resistance: Excellent.
  • Dimensional stability: Good.
  • Resiliency: Excellent.
  • Softening point: Nylon 6,6 – 2290C, Nylon 6 – 1490C.
  • Melting point: Nylon 6,6 – 2520C, Nylon 6 – 2150C.
  • Hand feel: Soft and smooth.
Chemical properties
  • Acid: Nylon 6,6 is attacked by mineral acids is disintegrated or dissolved almost. But is inert to dilute acetate acid and formic acids even of the boil. It is dissolved in the concentrated formic acid. Nylon 6 is attacked by mineral acid but resistant to dilute boiling organic acid.
  • Bleaches: Not attacked by oxidizing and reducing bleaches but may be harmed by chlorine and strong oxidizing bleaches.
  • Alkali: Nylon is substantially inert to alkalis.
  • Organic solvent: Most of the solvent have little or no effect on nylon. Phenol metacressol and formic acid dissolve the fibre but solvents used in stain removal and dry cleaning do not damage it.
  • Light: No discoloration. Nylon 6 gradually loss of strength on prolonged extension.
  • Biological: Neither micro organism nor moth, larvae attack nylon.
  • Electrical: High insulating properties leads to static charges on the fibre.
  • Flammability: Burns slowly.
Uses of Nylon
Apparel use
High tenacity nylons are used for parachute fabrics, cords and ropes. Having good dimensional stability, are used for ladies gloves, ladies hose, under wear, swimming wear, stocking, hosiery fabric etc.
Domestic use
It is used for home furnishing, in carpets, in upholstery and in ropes and cords.
Industrial use
In finishing nets, tire cords, filtering cloths, sewing threads, tow ropes are made of Nylon. It is used in manufacturing of belts of various machines (Flat belt, V-belts).
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He is a Textile Engineer and like writing on Apparel

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