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Polyamide 6.6 PA66


In September 1931, American chemist Wallace Carothers reported a research carried out in the laboratories of the DuPont Company on "giant" molecules called polymers. He focused his work on a fiber referred to simply as "66" - a number derived from its molecular structure.


Polyamide 6.6 is synthesized by polycondensation of hexamethylenediamine as well as adipic acid. Though the chemical structure is very similar, production process highly differs from the one for Polyamide 6, which is produced by ring-opening polymerization.

Hexamethylenediamine and adipic acid serve as basic material for the polycondensation of polyamide 66.

Despite the production process, Polyamide 6.6 and Polyamide 6 are very alike in chemical structure as well as properties. Slightly different properties are mainly to be met for melting point or dyability. Polyamide 6.6 has a higher melting temperature, is however harder to dye or to be furnished with FR properties. 


These properties can also be combined, for example via bicomponent products.


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