Tuesday, May 29, 2012

Aromatic Polyamides

  • A polyamide is a polymer containing monomers of amides joined by peptide bonds. 
  • Advantages of aromatic polyamides:good mechanical behaviour, products can be used within a wide temperature interval, good dimensional stability
  • Aramid fiber characteristics Are good resistance to abrasion, good resistance to organic solvents, nonconductive, no melting point, low flammability, sensitive to ultraviolet radiation
  • The aramids have nowadays found applications in: Heat-protection products; cut-protection products; ballistic-protection products; tires; transmission belts; friction product; sealing materials (gaskets and braided packings); adhesives; ropes and cables
  • The most common methods for the preparation of aromatic polyamides are the reaction of diacid dichlorides with diamines at low temperatures or direct condensation reactions in solution of aromatic diacids with diamines at high temperatures. 

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