Question

Nylon – 66 is an example of:
A) Polypropylene
B) Polyester
C) Polyamide
D) Polystyrene

Answer 1

Hint: Nylon – 66 is made up of two monomers, each of which contains six carbon atoms. The monomers are hexamethylenediamine and adipic acid. It is produced by the polycondensation of the two monomers.

Complete step by step answer:
Nylon – 66 is a member of the synthetic polymers known as polyamides. It is made by the polycondensation of adipic acid and hexamethylenediamine and contains a total of 12 carbon atoms in each individual repeating unit. Equal amounts of hexamethylene diamine and adipic acid are combined with water in a reactor. This is then crystallized to make nylon salt, an ammonium/carboxylate mixture. The nylon salt is then put into a reaction vessel where the polymerization process takes place either in batches or continuously.

Nylon – 66 and nylon 6 are the two most commonly used polymers in textile and plastic industries. A polyamide is a synthetic polymer made by the linkage of an amino group of one molecule and a carboxylic acid group of another, including many synthetic fibres such as nylon.
Therefore, nylon – 6,6 is a polyamide.

Hence, the correct answer is (C) Polyamide.

Additional information:
Some properties of nylon – 6,6 are:
-It has a high tensile strength.
-It provides a very good resistance to photo degradation.
-It is resistant towards heat.
-It is an amorphous solid.

Note:
Remember that nylon 6 is different from nylon – 6,6. The number at the end of the name generally denotes the number of carbons of monomers involved.