Tire cords Kevlar

Polyaramid is a term applied to polyamides containing aromatic groups. These polymers were originally made for use as tire cords but have since found many other uses, a. Kevlar is used in bulletproof vests and many high-strength composites. The structure of Kevlar is... 

High modulus fibers as strong as steel but have one-fihh the weight, ideally suited as tire cord materials and for ballistic vests, e.g., Kevlar yXwaron. 

Take, for example, the two major commercialized advanced composite fibers, Kevlar and carbon fiber. When Kevlar was first developed, DuPont believed it would be used as a replacement for fiberglass in ropes, tire cords, and many... 

Rayon fibers are used to prepare textile fabrics (paificulariy high fashion types), often in combination with cotton or polyester, in high fashion jeans, non wovens and special papers (e.g. tea bags). Once the mqor tire cord for both automotive and truck tires, it has been largely displaced by polyester in automotive tires and Kevlar in truck tires. This accounted for a major loss of demand for rayon. However, it is still used to a small extent in some automotive tires. 

Aromatic polyamides, depending on the position of the reactive site in the reactants, form polymers known as Nomex (flameproof protective clothing) or Kevlar (high fiber strength tire cord) (1). 

High modulus fibers from lyotropic aromatic polyamides, poly(p-phenylene terephthalamide) (PPTA), first commercialized under the Kevlar trademark by DuPont [614], find major applications as fibers in tire cords and heat and chemical resistant fabrics. Other fibers in this class of materials are used in important applications such as firefighter and military uniforms, gloves, and in many other hazardous applications. The aromatic polyamides, or aramids, are produced by a dry jet-wet spinning process where the nematic structure in solution is responsible for the high modulus fiber performance [615-619]. Another class of lyotropic fibers, also produced by dry jet-wet spinning, are the rigid-rod... 

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