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Aliphatic Polyamides

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  • A polyamide is a polymer containing monomers of amides joined by peptide bonds.
  • They can occur both naturally and artificially, examples being proteins, such as wool and silk, and can be made artificially through step-growth polymerization or solid-phase synthesis, examples being nylons, aramids, and sodium poly(aspartate).
  • According to composition of their main chain, polyamides are classifieds as aliphatic, semi-aromatic and aromatic. Examples of Aliphatic type polyamides are PA6(Nylon 6) and PA 66(Nylon 6,6).
  • Nylon 6 is used as thread in bristles for toothbrushes, surgical sutures, and strings for acoustic and classical musical instruments, including guitars, violins, violas, and cellos.
  • It is also used in the manufacture of a large variety of threads, ropes, filaments, nets, and tire cords.
  • Nylon 6,6 is made of hexamethylenediamine and adipic acid, which give nylon 6,6 a total of 12 carbon atoms in each repeating unit.
  • The end groups of an aliphatic polyamide may be changed by reacting a polyurea with a molten aliphatic polyamide at temperatures of about 260'C.
  • Polyamides are synthesized by two main methods, a) is polycondensation of diacid and diamind and b) ring opening polymerization of lactams.
  • Aliphatic Polyamides can be synthesized by condensation of bifunctional monomers.
  • These polyamides are very useful and versatile material that are valuable because of their superior physicochemical properties such as abrasion resistance, chemical inertness, thermoplasticity etc.
  • Polyamide 6 were synthesized by ring-opening anionic polymerization of epsilon-caprolactam in the presence of sodium caprolactamate as a catalyst and caprolactam-functionalized silica as an initiator.
  • Depolymerization of nylon6 to epsilon-caprolactam with environmental-friendly heteropolyacid catalyst at temperatures between and 553k and 603k, under different pressures in water medium.
  • Crystallization behaviour in a number of blends and copolymers of nylons was investigated using time-resolved X-ray scattering.

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