Skip to main content

Kevlar.

Kevlar.

  • Kevlar is a man made fibre.
  • Kevlar is a polyamide formed from benzene-1,4-diamine and benzene-1,4-dicarboxylic acid.
    This image shows synthesis of Kevlar from benzene-1,4-diamine and benzene-1,4-dicarboxylic acid.
    Kevlar.
  • Kevlar can also be produced from benzene-1,4-diamine and benzene-1,4-dicarbonyl dichloride.
    This image shows synthesis of Kevlar from benzene-1,4-diamine and benzene-1,4-dicarbonyl dichloride.
    Kevlar.
  • It is strong but relatively light.
  • Kevlar can resist attacks from many different chemicals, though long exposure to strong acids or bases will degrade it over time.
  • Unlike most plastics it does not melt. It is reasonably good at withstanding temperatures and decomposes only at ~450°C.
  • Kevlar is used in making military body armour and jackets.
  • Military helmets are made from Kevlar.
  • Its resistance to chemicals and temperature extremes make it an ideal component for ropes and cables.
  • Kevlar is used as a strength member in optical fibre cables.
  • Protection vest are made with Kevlar.
    This image shows uses of Kevlar in military body armour, military helmets,ropes, cables, optical fibre cables, protection vests.
    Uses of Kevlar.

Questions on Kevlar;

Q1) What is Kevlar?
Ans) Kevlar is a man made fibre.
Q2) How is Kevlar prepared?
Ans) Kevlar is a polyamide formed from benzene-1,4-diamine and benzene-1,4-dicarboxylic acid.
Kevlar can also be produced from benzene-1,4-diamine and benzene-1,4-dicarbonyl dichloride.
Q3) Write some properties of Kevlar?
Ans) Some properties of Kevlar are given below;
1) It is strong but relatively light.
2) Kevlar can resist attacks from many different chemicals, though long exposure to strong acids or bases will degrade it over time.
3) Unlike most plastics it does not melt. It is reasonably good at withstanding temperatures and decomposes only at ~450°C.
Q4) Write some uses of Kevlar?
Ans) Some uses of Kevlar are given below;
1) Kevlar is used in making military body armour and jackets.
2) Military helmets are made from Kevlar.
3) Its resistance to chemicals and temperature extremes make it an ideal component for ropes and cables.
4) Kevlar is used as a strength member of optical fibre cables.
5) Protection vest are made with Kevlar. Next

Comments

Post a Comment

Popular posts from this blog

Determination of molecular weight by osmotic pressure method

Determination of molecular weight by osmotic pressure method. Osmotic pressure method is also called membrane osmometry. This method is widely used to determine the number average molecular weight of polymers. This method is based on the phenomenon of osmosis. If a pure solvent is separated from a solution through a semipermeable membrane, due to concentration (chemical potential) difference between the solvent and solution, the solvent will flow into the solution through semipermeable membrane. The pressure applied on the solution to completely stop the flow of solvent into it through semipermeable membrane is called osmotic pressure. The theory of osmotic pressure also applies to a solution of polymers. Ordinary solution obeys Van't Hoff equation i.e π=cRT/M Where π is osmotic pressure, c  is concentration in mass per unit volume, R is gas constant, T is temperature and M is molar mass. The polymer solution are non ideal. Taking into account their deviation and us...
Post a Comment
Read more

Polylactic acid/PLA.

Polylactic acid/PLA. Polylactic acid is a biodegradable thermoplastic polymer . Polylactic acid is obtained from lactic acid monomer. Polylactic acid. Polylactic acid is stable to UV radiation. Polylactic acid has good resistance to moisture. Polylactic acid has good elasticity. Polylactic acid is an aliphatic polyester . It can be used as a food packaging polymer. Polylactic acid is suitable for textile fibre applications such as shirts, carpets, sportswear etc. Polylactic acid is used in implants and medical devices (screws, sutures etc). Polylactic acid is suitable for use in floor mats. Uses of Polylactic acid. Questions on Polylactic acid/PLA; Q1) What is Polylactic acid? Ans) Polylactic acid is a biodegradable thermoplastic polymer. Q2) What is the monomer of Polylactic acid? Ans) Polylactic acid is obtained from lactic acid monomer. Q3) Write some properties of Polylactic acid? Ans) Some properties of Polylactic acid are given below; ...
Post a Comment
Read more

Monomers.

Monomers. A monomer is a molecule that can be reacted together with other monomer molecules to form a larger polymer chain. Some monomers are given below with their polymers . Tetrafluoroethene ; Tetrafluoroethene is the monomer of Teflon . Teflon and its monomer. Acrylonitrile (vinyl cyanide); Acrylonitrile is the monomer of Polyacrylonitrile . Polyacrylonitrile and its monomer. Isoprene; Isoprene is the monomer of Polyisoprene (natural rubber). Polyisoprene and its monomer. Chloroprene; Chloroprene is the monomer of Neoprene . Neoprene and its monomer. Vinyl chloride; Vinyl chloride is the monomer of Poly(vinyl chloride) . Polyvinyl chloride and its monomer. Vinyl acetate; Vinyl acetate is the monomer of Poly(vinyl acetate). Poly(vinyl acetate) and its monomer. Propylene; Propylene is the monomer of Polypropylene . Polypropylene and its monomer. Styrene; Styrene is the monomer of Polystyrene . Polystyrene and i...
Post a Comment
Read more