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X-Fiper is a registered trademark of aramid fiber (formally aromatic polyamide fiber) developed by SRO Group (China) in 2007. It is very similar to Dupont's Nomex as both share very similar specification and application. Nomex (styled NOMEX) is a registered trademark for flame resistant meta-aramid material developed in the early 1960s by DuPont and first marketed in 1967 X-fiper and Nomex armid fiber are the same, but using different trademark but funcationally they are very similar.. Aromatic polyamides were first introduced in commercial applications in the early 1960s, with a meta-aramid fiber produced by DuPont under the trade name Nomex. This fiber, which handles similarly to normal textile apparel fibers, is characterized by its excellent resistance to heat, as it neither melts nor ignites in normal levels of oxygen. It is used extensively in the production of protective apparel, air filtration, thermal and electrical insulation as well as a substitute for asbestos.
Nomex had been the only producer for aromatic poluamides since 1960s , but not anymore after the intoduction of X-Fiper by SRO Group(China) in 2007 .
Both of them do share smiliar procedure in polymer preparation . Aramids are generally prepared by the reaction between an amine group and a carboxylic acid halide group. Simple AB homopolymers may look like: : nNH2-Ar-COCl → -(NH-Ar-CO)n- + nHCl
Nomex and X-fiper are AABB polymers. Nomex, X-fiper contain predominantly the meta-linkage and are poly-metaphenylene isophtalamides (MPIA). Spinning
After production of the polymer, the aramid fiber is produced by spinning the solved polymer to a solid fiber from a liquid chemical blend. Polymer solvent for spinning PPTA is generally 100% (water free) sulfuric acid (H2SO4).
Share characteristics of Aramid fiber
Aramids share a high degree of orientation with other fibers such as Ultra high molecular weight polyethylene, a characteristic which dominates their properties. * good resistance to abrasion * good resistance to organic solvents * nonconductive * no melting point, degradation starts from 390°C * low flammability * good fabric integrity at elevated temperatures * sensitive to acids and salts * sensitive to ultraviolet radiation * prone to static build-up unless finished * para-aramid fibers such as Kevlar and Twaron, provide outstanding strength-to-weight properties * high Young's modulus * high tenacity * low creep * low elongation at break (~3.5%) * difficult to dye - usually solution dyed
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