Nylon 66 is produced by the reaction of 1,6 -hexanediamine...

Name: Problem 47, Chapter 27: General Chemistry: Principles and Modern Applications
Uploaded: 2020-06-24T21:56:03-08:00
Duration: 54 s
Channel: Catherine Lemar
Description: Nylon 66 is produced by the reaction of 1,6 -hexanediamine with adipic acid. A different nylon polymer is obtained if sebacyl chloride is substituted for the adipic acid. What is the basic repeating unit of this nylon structure?

Nylon 66 is produced by the reaction of 1,6 -hexanediamine with adipic acid. A different nylon polymer is obtained if sebacyl chloride is substituted for the adipic acid. What is the basic repeating unit of this nylon structure?

Key Concepts

Basic Repeating Unit in Polyamides

The basic repeating unit of a polyamide produced from a diamine and a diacid chloride consists of an amide linkage connecting an alkylene group from the diamine and an acyl group from the diacid chloride. This unit, which repeats along the polymer chain, is the structural foundation of the nylon and determines its overall chemical and physical characteristics.

Condensation Polymerization

Condensation polymerization is a process in which monomers react to form polymers with the simultaneous removal of a small molecule, often water or hydrogen halide. This type of polymerization is typical in the preparation of polyamides, where the combination of a diamine and a diacid (or its derivative) results in the formation of amide bonds linking the repeating units.

Polyamide Structure

Polyamides are polymers characterized by the presence of recurring amide linkages (-CONH-) along the polymer backbone. These materials are synthesized by the reaction of diamines with diacid derivatives, leading to long chains where each repeating unit consists of alternating segments derived from each monomer. The structure of these units is fundamental to understanding the properties of the resulting nylon material.

Step-growth Polymerization Mechanism

Step-growth polymerization involves the reaction of bifunctional monomers, where functional groups react and build progressively larger molecules. In the synthesis of polyamides, this mechanism allows for the formation of amide linkages between diamine and diacid chloride monomers, with small molecules such as HCl being eliminated during the process.

Reactivity of Acid Chlorides

Acid chlorides are highly reactive derivatives of carboxylic acids that facilitate rapid and efficient formation of amide bonds when they react with amines. This reactivity is particularly advantageous in polymerization reactions because it can lead to high yields of polyamide with fewer side reactions compared to when carboxylic acids are used directly.

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