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Encyclopedia > Polyamide
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A polyamide is a polymer containing monomers joined by peptide bonds. They can occur both naturally, examples being proteins, such as wool and silk, and can be made artificially, examples being Nylon, Kevlar and sodium poly(aspartate). Jump to: navigation, search A polymer is a generic term used to describe a substantially long molecule. ... Jump to: navigation, search In chemistry, a monomer (from Greek mono one and meros part) is a small molecule that may become chemically bonded to other monomers to form a polymer. ... Diagram showing the π-bonded amino acids and the point of rotation A peptide bond is a chemical bond formed between two molecules when the carboxyl group of one molecule reacts with the amino group of the other molecule, releasing a molecule of water (H2O). ... Jump to: navigation, search A representation of the 3D structure of myoglobin, showing coloured alpha helices. ... Wool in a shearing shed Long and short hair wool at the South Central Family Farm Research Center in Boonesville, AR Wool is the fiber derived from the hair of domesticated animals, usually sheep. ... Silk weaver Silk is a natural protein fiber that can be woven into textiles. ... Jump to: navigation, search This article covers the material nylon. ... Jump to: navigation, search Kevlar, also known as Twaron and poly-paraphenylene terephthalamide, is a synthetic fibre that is five times stronger than steel, weight for weight. ... Jump to: navigation, search Sodium poly(aspartate) is a condensation polymer based on aspartic acid. ...


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, ammonia or hydrogen chloride, is eliminated. A condensation reaction (also known as a dehydration reaction or dehydration synthesis) is a chemical reaction in which two molecules or moieties react and become covalently bonded to one another by the concurrent loss of a small molecule, usually water. ... In chemistry, especially in organic chemistry and biochemistry, an amino group is an ammonia-like functional group. ... Structure of a carboxylic acid Carboxylic acids are organic acids characterized by the presence of a carboxyl group, which has the formula -C(=O)-OH, usually written as COOH. The salts and anions of carboxylic acids are called carboxylates generally. ... In organic chemistry, an acid chloride (or acyl chloride) is very reactive derivative of a carboxylic acid. ... Jump to: navigation, search Water (from the Old English word wæter; c. ... Jump to: navigation, search Ammonia is a compound of nitrogen and hydrogen with the formula NH3. ... Hydrogen chloride, also known under the name HCl, is a highly corrosive and toxic colorless gas that forms white fumes on contact with humidity. ...


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: Jump to: navigation, search In chemistry, an amino acid is any molecule that contains both amino and carboxylic acid functional groups. ... An Alkyl is a univalent radical containing only carbon and hydrogen atoms arranged in a chain. ...

The reaction of two amino acids. Many of these reactions produce long chain proteins
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The reaction of two amino acids. Many of these reactions produce long chain proteins

Kevlar (pictured below) is made from two different monomers which continuously alternate to form the polymer: Download high resolution version (1181x354, 6 KB)Created from editing of by Luke Surl. ... Download high resolution version (1181x354, 6 KB)Created from editing of by Luke Surl. ... Jump to: navigation, search A representation of the 3D structure of myoglobin, showing coloured alpha helices. ... Jump to: navigation, search Kevlar, also known as Twaron and poly-paraphenylene terephthalamide, is a synthetic fibre that is five times stronger than steel, weight for weight. ...

The reaction of 1,4-phenyl-diamine (para-phenylenediamine) and terephthaloyl chloride to produce Kevlar
The reaction of 1,4-phenyl-diamine (para-phenylenediamine) and terephthaloyl chloride to produce Kevlar

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