write the method of preparation of Nylon 6.6
Answers
Nylon -6,6 is synthesized by polycondensation of hexamethylenediamine and adipic acid. Equivalent amounts of hexamethylenediamine and adipic acid are combined with water in a reactor. This is crystallized to make nylon salt, an ammonium/carboxylate mixture.
Explanation:
Complete step by step solution:
a) First of all, we have to know what Nylon-6,6 is. Nylon-6,6 is a polymer used in textile and plastics industries. Nylon-6,6 is made of two monomers, they are hexamethylenediamine and adipic acid.
Nylon-6,6 is prepared by polycondensation of hexamethylenediamine and adipic acid. Equivalent amounts of hexamethylenediamine and adipic acid are combined with water in a reactor. This is crystallized to make nylon salt, an ammonium-carboxylate mixture. The nylon salt goes into a reaction vessel where the polymerization process takes place either in batches or continuously. Let us look the reaction:
n[HOOC−(CH2)4−COOH]+n[H2N−(CH2)6−NH2]→[−OC−(CH2)−CO−NH−(CH2)6−NH−]n+(2n−1)H2O
Removing water drives the reaction toward polymerization through the formation of amide bonds from the acid and amine functions. Thus, molten Nylon-6,6 is formed.