DuPont Nomex

DuPont Nomex on Demand EI DU PONT DE NEMOURS CO (DUPONT)... 

Besides scientific names, many polymers are indicated by their common name, trade name, brand name, or abbreviation (commercial names) [4]. Typical examples of common names are nylon or silicone. Several nylons are known and the name nylon 6 is used for poly[imino(1-oxo-1,6-hexandiyl)], the name nylon 66 is used for poly(iminohexa-methyleneiminoadipolyl), etc. Trade names such as Teflon for poly(tetrafluoro-ethylene) made by DuPont, Nomex for poly(iminoisophthaloylimino-1,3-phenylene), or Kevlar for poly(iminoisophthaloylimino-1,4-phenylene) are also common. Many abbreviations are in use for both homopolymers and copolymers. Table 1.2.1 gives some of the common abbreviations for polymers. 

Fig. 8.1 Using DuPont Thermo-Man to test Bristol Uniforms (UK) turnout gear made from Hainsworth TITAN fabric that incorporates DuPont Nomex and DuPont Kevlar fibres (note that the test is to EN 469 using a flame source of 84kWm" for 8 s) (a) before,...

This is no place to learn you re not wearing DuPont Nomex ... 

The Nomex family products consists of staple fibres, continuous filament yarns, paper, woven, hydroentangled and coated fabrics, and they are used in firefighter garments insulation in fire resistant thermal protective apparel and apparel fabrics to protect against flash fire and electric arc exposure. Examples of DuPont Nomex fibres suitable for protective clothing are summarized in Table 3.3 below. 

Aramid is the name given to a class of polymers that are aromatic polyamides. The definition of an aramid fiber is a manufactured fiber in which the fiber forming substance is along chain synthetic polyamide in which at least 85% of the amide linkages are attached directly to two aromatic rings . There are various aramid fibers, including poly-m-phenylene isophthalamide known for its flame resistant characteristics (Dupont Nomex ). A second aramid is poly-p-phenylene terephthalamide developed by Akzo and DuPont, which consists of oriented para-substituted aromatic units. This makes polymer chains rigid and rodlike. 

Aramid molecules are particularly well suited to be made into synthetic fiber. Some well-known aramid fibers include Nomex and Kevlar , both developed by DuPont. Nomex has exceptionally high heat resistance and is often used to make flame-proof clothing. Kevlar has exceptionally high strength, with a tensile strength-to-weight ratio five times greater than steel. 

Up to three of the hydrogens on a benzene ring can be replaced with a nitro (-NO2) group by reaction of nitric acid in sulfuric acid. When two hydrogens are replaced by nitro in this manner (dinitration), one isomer, the meta- or 1,3-, predominates. When three hydrogens are replaced (trinitration), the predominant isomer is the 1,3,5-isomer mera-dinitrobenzene is made by this method as a starting material for mera-phenylenediamine, one of the components in the manufacture of a heat-resistant nylon sold in the U.S. as Nomex by DuPont. 

Ethylene-propylene monomer (EPM) elastomers Aromatic nylons (aramids) (Nomex DuPont)... 

Kwolek s task at DuPont was to find a new kind of fiber that was resistant to acids and bases and that would remain stable at high temperatures. In 1964, she discovered such a product, an aromatic polyamide that was five times as strong as steel with half the density of fiberglass. The material was given the name aramid. Aramid was later marketed under the trade names of Kevlar and Nomex . Today, aramid is one of the most widely used substances in polymer matrix composites. 

FIGURE 4.2 CXs-plot obtained from the high-resolution N2 isotherm at 77 K of an ACF prepared from Nomex (E.I. DuPont de Nemours Company, Inc., Wilmington, DE) by physical activation with C02 (72% burn-off degree). Spheron 6 carbon black is used as reference. 

As pointed out in the preceding section, a second route for developing fibers having properties approaching the ultimate is the use of polymer chains that have high intrinsic stiffness and will remain extended in solution or melt. The development of aramid organic fibers based on aromatic polyamides met these requirements and added another chapter to the history of the development of synthetic fibers. Nomex aramid, a thermally resistant fiber based on a meta-oriented structure, was commercialized by the DuPont company in 1962. 

Isophthalic acid is produced from m-xylene by processes analogous to those used for terephthalic acid except that five to six times higher pressures are required. The product (m.p. 342°C) is chiefly used for the preparation of the high thermal stability aramid polymer, Nomex (Dupont), used for electrical insulation in thermally aggressive environments. 

Teflon and Nomex are registered trademarks of DuPont. Ryton is a registered trademark of Phillips Petroleum Company. The mention of companies and trade names does not constitute endorsement or recommendation for use. 

The term aramid is used to describe aromatic polyamides, which were developed to improve the heat and flammability resistance of nylon. Nomex is a highly heat-resistance nylon introduced in 1961 by DuPont. It is produced by the solution or interfacial polymerization of isophthaloyl chloride and 7M-phe-nylenediamine ... 

The high temperature resistant polyamides, a poly(isophthalamide) of 4,4 -bis(p-aminophenyl)-2,2 -bithiazole) (TEA), a poly-terephthalamide of l,3-bis(3-aminobenzamido)benzene (M3P), and the aromatic polyamide Nomex (DuPont), were studied by Johnson et al. [31], Activation spectra for discoloration and strength loss were obtained using a prism-dispersed spectrum from a xenon source using a technique similar to that used by Hirt and Searle [19]. 

Aramid reinforcement is also available as paper and sold under tradenames of Nomex by DuPont and TP Technora from Teijin America. Aramid paper is used in circuit boards to improve crack resistance and to... 

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