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Our world-class, innovative approach provides solutions for some of the world's biggest challenges. DuPont is helping to meet increased global demand for affordable meat products with optimized in-feed animal nutrition and DuPont Crop Protection uses inclusive thinking to create answers in insect, weed and disease control that help growers Proven performance and plenty of options — that's what our product DuPont brings together a wide range of sustainable food ingredients to increase the quality of food products, while DuPont offers a broad range of food protection products to help you meet the rigorous standards of your food safety programs From skin care to hair care, DuPont Personal Care products are designed to serve a variety of your needs.
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DuPont collaborates with customers around the world, providing a spectrum of polymer materials and expert application DuPont Agriculture offerings deliver global nutrition through higher crop yields and healthier foods while developing solutions to help meet the world's energy needs. See how our broad family of materials and global development experts can help the automotive industry reduce emissions and improve fuel economy, design, safety, and affordability.
At DuPont, we're focused on dynamic science that generates real-world solutions. We invite you to collaborate with our global teams to find science-driven, sustainable energy solutions. Amide groups have the general chemical formula CO-NH. They may be produced by the interaction of an amine NH 2 group and a carboxyl CO 2 H group, or they may be formed by the polymerization of amino acids or amino-acid derivatives whose molecules contain both amino and carboxyl groups.
Broadly defined, the polyamides include proteins and peptides , which are naturally produced polymers consisting of amino-acid repeating units. In molecular biology the amide linkage is usually referred to as the peptide bond. More narrowly defined, the polyamides are an important group of industrially produced synthetic polymers. The most important is nylon , actually an extremely versatile class of polymers that are made into indispensable fibres and plastics. Another class of polyamides made into fibres is the so-called aramids , or aromatic polyamides—amide polymers that contain phenyl rings in their repeating units.
Some nylons also contain phenyl rings, so the two classes are actually distinguished by the number and frequency of the rings. When 85 percent or more of the amide groups are linked directly to phenyl rings, the polyamide is classified as an aramid.
When the rate is lower than 85 percent, the polymer is classified as a nylon. We welcome suggested improvements to any of our articles. You can make it easier for us to review and, hopefully, publish your contribution by keeping a few points in mind. Your contribution may be further edited by our staff, and its publication is subject to our final approval. Unfortunately, our editorial approach may not be able to accommodate all contributions.
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The Editors of Encyclopaedia Britannica. Learn More in these related Britannica articles: Polyamide s can be formed by two different methods. The first is the condensation of molecules that contain both a carboxyl and an amino NH 2 or NH group.
This is the method by which proteins are synthesized in nature. The carboxyl group of one amino acid…. Synthetic polyamides are produced by a condensaton reaction between monomers, in which the linkage of the molecules occurs through the formation of the amide groups. As noted in industrial polymers, chemistry of: The difference in properties….
Polyamides can also be synthesized from dinitriles using acid catalysis via an application of the Ritter reaction. This method is applicable for preparation of nylon 1,6 from adiponitrile, formaldehyde and water. Additionally, polyamides can be synthesized from glycols and dinitriles using this method as well. Polyamide is a type of synthetic fabric that contains sweat-wicking and water-repelling properties that make it an ideal material for outerwear and sports clothing. Polyamide fabrics are found in many types of clothing, including jackets, shirts and pants. These fabrics are comprised of several. DuPont™ Zytel® PA is a versatile, cost-efficient polyamide nylon that is widely specified for its light weight, strength, durability, and heat resistance.