Skip to main content

Nylon

Nylon

  • Wallace Carothers was an American chemist, inventor and the leader of organic chemistry at DuPont, credited with the invention of nylon (nylon 6,6).
  • This fiber was first introduced in the 1930s as an early substitute for silk.
  • The nylons are polyamides with recurring amide groups. They contain carbon, oxygen, nitrogen and hydrogen elements.
    Amide
    Amide group.
  • Nylon is a synthetic fibre that is strong and very light in weight.
  • Nylon is also easy to wash.
  • Nylon fibre is highly resistant to heat, UV rays and chemicals.
  • Nylon is a lustrous fibre.
  • Nylon fabrics retain their shape and appearance after washing. It has good stability and does not shrink.
  • Nylon can be easily dyed with a wider range of dyes. The dyed fabrics retain their colour and have good resistance to fading.
  • Nylon is used to make ropes for different purposes, curtains, socks, toothbrush bristles, sleeping bags, tents, fishing nets, parachutes, sportswear, strings of badminton and tennis racquets and car seat belts.
    Uses of polyamides
    Uses of nylon.
  • Nylon riots were a series of disturbances at American stores created by a nylon stocking shortage. Next
    Nylon riots.

Comments

Popular posts from this blog

Determination of molecular weight of polymers by viscosity method.

Determination of molecular weight of polymers by viscosity method. It is a simple method for determining the molecular weight of polymers. Addition of polymers in the solvent increases the viscosity of the solvent, due to introduction of inhomogeneities by the polymers. If η₀ is the viscosity of the solvent and η is the viscosity of the solution at the same temperature, then the relative viscosity is given by Relative viscosity. Specific viscosity:  It is defined as the relative increase in viscosity and is given as Specific viscosity. Reduced viscosity: It is defined as the relative increase in viscosity per unit concentration (C) of polymer and is given as Reduced viscosity. Intrinsic viscosity: The reduced viscosity is dependent on concentration (C). If a graph is plotted between  reduced viscosity vs concentration then the extraplotation value when C=0 is called intrinsic viscosity. Intrinsic viscosity. Graph of reduced viscosity vs concentr

Determination of molecular weight by Light scattering method.

Determination of molecular weight by Light scattering method. Due to big size macromolecules in solution, turbidity is produced. The light rays get scattered, when pass through macromolecule solution due to turbidity. The turbidity T is given by Where I₀ is the intensity of incident light. Iₜ is the intensity of transmitted light after passing through a solution of length l.        In case of proteins or higher polymers the turbidity is small and is determine from the intensity of light scattered at 90° to the beam. This can be done by using a simple photometer as shown in figure below. Turbidity increase with increase in concentration as well as molecular weight. The Turbidity is related to molecular weight by the equation given by Debye. Hc/T=1/M+2Bc Where B is second virial coefficient and H is a constant. If we plot a graph between Hc/T vs c we get a straight line with intercept 1/M. Thus This curve was plotted by Zimm, so is called Zimm's Curve. Thus the c

Polypropylene (PP)

Polypropylene (PP). Polypropylene (PP) is also known as polypropene. Polypropylene is made from the polymerisation of propylene gas in the presence of Zeiglar Natta catalyst or metallocene catalyst. Polypropylene. Thus propene (or propylene) is the monomer of polypropylene. Polypropylene is a highly flammable material. It is sensitive to microbial attacks, such as bacteria and mold. It exhibits excellent resistance to diluted and concentrated acids, alcohols and bases. Polypropylene is used to make lunch boxes, margarine containers, yogurt pots, syrup bottles etc. Disposable syringes is the most common medical application of polypropylene. Polypropylene rope and twine are very strong and moisture resistant very suitable for marine applications. Polypropylene, highly colorfast, is widely used in manufacturing carpets, rugs and mats. Uses of Polypropylene. Questions on polypropylene; Q1) What is polypropylene? Ans) Polypropylene is a polymer of propylen