A polyamide is a polymer containing monomers of amides joined by peptide bonds. They can occur both naturally, examples being proteins, such as wool and silk, and can be made artificially, examples being nylons, aramids, and sodium poly(aspartate).

Production from monomers

The amide link is produced from the condensation reaction of an amino group and a carboxylic acid or acid chloride group. A small molecule, usually water, or hydrogen chloride, is eliminated.

The amino group and the carboxylic acid group can be on the same monomer, or the polymer can be constituted of two different bifunctional monomers, one with two amino groups, the other with two carboxylic acid or acid chloride groups.

Amino acids can be taken as examples of single monomer (if the difference between R groups is ignored) reacting with identical molecules to form a polyamide:

Aramid (pictured below) is made from two different monomers which continuously alternate to form the polymer and is an aromatic polyamide:

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  • polyamide — [ pɔliamid ] n. m. • 1913; de poly et amide ♦ Chim. Corps résultant de la réaction d un polyacide sur une polyamine. Utilisation des polyamides dans la fabrication de fibres textiles. Tube en polyamide. ● polyamide nom masculin Polymère ayant… …   Encyclopédie Universelle

  • Polyamide 11 — (PA 11) or Nylon 11 is a polyamide derived from vegetable oil. It is produced by Arkema under the tradename Rilsan from castor beans. [ [http://www.arkema inc.com/index.cfm?pag=109 Rilsan Polyamide 11 and 12] , accessed September 12, 2008.] PA 11 …   Wikipedia

  • polyamide — [päl΄ē am′īd΄] n. [ POLY + AMIDE] any of various natural or synthetic compounds having two or more amide groups; esp., a polymeric amide, as nylon …   English World dictionary

  • Polyamide — Polyamid Dichte 1,14 g·cm−3 Elektrische Leitfähigkeit (σ) 10−12 (Ω·m)−1 Wärmeleitfähigkeit 0,25 W·m−1·K−1 Zug E Modul 2.300 N·mm−2 Glasübergangstemperatur …   Deutsch Wikipedia

  • Polyamide — Un polyamide est un polymère contenant des fonctions amides − C( = O) − NH − résultant d une réaction de polycondensation entre les fonctions acide carboxylique et amine. En 1927, la société américaine DuPont constitue un service de recherches… …   Wikipédia en Français

  • Polyamide — Poly|amide,   Abkürzung PA, Polymere mit der wiederkehrenden Carbonsäureamidgruppe CO NH .   Die Herstellung der Polyamide kann durch Polykondensation von Diaminen mit Dicarbonsäuren erfolgen, z. B. indem das aus Hexamethylendiamin und… …   Universal-Lexikon

  • polyamide — poliamidas statusas T sritis chemija apibrėžtis Heterograndinis polimeras, kurio kiekvienoje pasikartojančioje sandaros grandyje yra –CONH– grupių. atitikmenys: angl. polyamide rus. полиамид …   Chemijos terminų aiškinamasis žodynas

  • Polyamide (PA) — zählen zu den Thermoplasten und werden durch Polykondensation von Diaminen (basenartige organische Verbindungen, die zweimal die Aminogruppe Nb im Molekül enthalten) mit Dicarbonsäuren oder aus Aminosäuren hergestellt. Die Polyamide werden nach… …   Erläuterung wichtiger Begriffe des Bauwesens

  • polyamide — noun Etymology: International Scientific Vocabulary Date: 1929 a compound characterized by more than one amide group; especially a polymeric amide (as nylon) …   New Collegiate Dictionary

  • polyamide — /pol ee am uyd, id/, n. Chem. a polymer in which the monomer units are linked together by the amide group CONH . [1925 30; POLY + AMIDE] * * * …   Universalium

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