Nomex is a flame-resistant and heat-resistant synthetic aromatic polyamide fiber developed by DuPont in the 1960s. It is produced through a condensation reaction between m-phenylenediamine and isophthaloyl chloride monomers. The resulting long-chain polymer is spun into fibers that are less rigid than other aramids due to bends in the polymer chain. Nomex fibers are widely used for heat insulation, electrical insulation, and protective clothing such as in aviation, firefighting, and auto racing due to their flame-resistant and heat-resistant properties.

1. NOMEX

2. History
 Dr. Wilfred Sweeny, a Scottish-born scientist was
responsible for the discoveries leading to Nomex
the Meta-Aramid fiber.
 In 1960, DuPont introduced meta-aramid in
commercial applications under the trade name
Nomex.

3. Polymer formation
 The polymer is produced by
condensation reaction from the monomers
m-phenylenediamine and isophthaloyl chloride.
 Aromatic polyamides should be prepared from
aromatic dicarboxylic acid and aromatic
diamines. But aromatic dicarboxylic acid are
unreactive that’s why we use more reactive
aromatic acid chlorides.

4. Structure of NOMEX
 NOMEX is a long chain polyamide.
 Is made from meta-phenylenediamine and
isophthaloyl chloride.
 It is less rigid because the bends in the polymer
chain.
 The polymer is spun into a fiber.
 Nomex is also made into sheets of paper and
then formed into honeycomb shapes.

5. Chemical Structure
Polymer Structure

6. Preparation
Steps for manufacturing
Polymer formation
Spinning
a)Preparation of dope solution
b)Extrusion
c)Solidification

7. About NOMEX
 Flame resistant
 Heat resistant
 Fiber
 Long chain
molecule
 Lightweight

8. Uses of NOMEX
 Heat insulation
 Electrical insulation
 Automotive
 Interior decoration
 Aviation
 Protective apparel
 Fire apparel
 Race apparel