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Polyamides  ©

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1 Patent Abstracts

33 Patent Titles

Patentpedia Index 

5/18/2016 through 5/16/2012

* Note:  This collection is not complete.  Items may be missing and whole weeks may not be covered.  "Perfection is not of this world!"  Please send Maro missing patent numbers  for inclusion.  Experts are invited to send important, basic patents  or patents on new Topics. (RDC 4/29/2016)
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1 Topics

Polymers (C)

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0 Subtopics

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2 Notes

Beginning

     1. Polyamides  

     2. Polymerization

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2. Polymerization  

Forming aramid copolymers is difficult because of the very different reactivity ratios of the reactants.  Lee of Dupont, developed a method for forming a controlled copolymer composition by mixing two organic (N-methyl-2-pyrrolidone (NMP) or dimethylacetamide) solutions.  One of the solutions contains a precise ratio of  amino phenyl benzimidazole and paraphenylene diamine dihydrochloride.  The other solution with the same solvent contains terephthaloyl dichloride .  Polymerization occurs when the two solutions are mixed.  The HCl form forms a rigid monomer enabling precise copolymerization to high molecular weights.

Lee, US Patent 8,835,600 (9/16/2014) 

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 1. Polyamides 

“A polyamide is a polymer containing monomers of amides joined by peptide bonds. They can occur both naturally and artificially, examples being proteins, such as wool and silk, and can be made artificially through step-growth polymerization or solid-phase synthesis, examples being nylons, aramids, and sodium poly(aspartate). Polyamides are commonly used in textiles, automotives, carpet and sportswear due to their extreme durability and strength.

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.”

Wikipedia, Polyamides, (5/16/2012)

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Copyright 2016 by Roger D. Corneliussen.
No part of this transmission is to be duplicated in any manner or forwarded by electronic mail without the express written permission of Roger D. Corneliussen

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Roger D. Corneliussen, Editor
Professor Emeritus
Materials Engineering
Drexel University, Philadelphia, PA
Editor
Maro Publications
Telephone: 610 363 1533
Email:
cornelrd@bee.net
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