Question

When condensation product of hexamethylenediamine and adipic acid is heated to \[353{\text{ }}K{\text{ }}\left( {80^\circ C} \right)\] in an atmosphere of nitrogen for about 4-5h, the product obtained is:
(A) Solid polymer of nylon 66
(B) Liquid polymer of nylon 66
(C) Gaseous polymer of nylon 66
(D) Liquid polymer of nylon 6

Answer 1

Hint: This type of reaction is called a polymerization reaction and it is carried out in a vessel or a reactor with the application of heat and with the addition of different substituents. So, students draw the structures of hexamethylenediamine and adipic acid and combine the two structures by eliminating a water molecule.

Complete step by step answer:
Nylon–66 is produced when the condensation product of hexamethylenediamine and adipic acid is heated in presence of nitrogen, at a very high temperature. This is a polymerization reaction. The reaction is as follows :
\[
  HO - \mathop C\limits_{\mathop O\limits^{||} } - C{H_2} - C{H_2} - C{H_2} - C{H_2} - \mathop C\limits^{\mathop O\limits_{||} } - OH + {H_2}N - C{H_2} - C{H_2} - C{H_2} - C{H_2} - C{H_2} - C{H_2} - N{H_2} \\
   \to - - - (\mathop C\limits_{\mathop O\limits^{||} } - C{H_2} - C{H_2} - C{H_2} - C{H_2} - \mathop C\limits^{\mathop O\limits_{||} } - NH - C{H_2} - C{H_2} - C{H_2} - C{H_2} - C{H_2} - C{H_2}NH) - - - -
 \]

So, the correct answer is Option B.

Additional information:
Characteristics and uses of nylon 6,6 :
It is used in making carpets , toothbrush bristles , parachutes.
Nylon-66 (read as nylon-six-six) can be cast into a sheet or fibers by spinning devices.
Nylon fibers have high tensile strength.
They are tough and resistant to abrasion.
They are also somewhat elastic in nature.
Condensation Polymers - Condensation Polymers is a type of polymers , the monomers react together with the elimination of a simple molecules like \[{H_2}O\] , \[ROH\] or \[N{H_3}\] , etc . The reaction is called condensation and the product formed is called condensation polymer . As the process involves the elimination of byproduct molecules , the molecular mass of the polymer is not the integral multiple of the monomer units . For example, nylon - 66 is a condensation polymer of hexamethylene diamine and adipic acid .
Some other examples of condensation polymers are :
Dacron (polyester) : A polymer of ethylene glycol and terephthalic acid .
Bakelite : A polymer of phenol and formaldehyde .

Note: There are many types of polymerization reaction. In condensation polymerization the step growth polymers are formed for example- polyamide, formaldehyde, resin, polyesters etc. So, students should always remember to consider that the above reaction is a step growth reaction and before doing these questions you should have a deep knowledge of types of polymerization reaction, formulas and its example. Nylon – 6 6 a linear co-polymer of adipic acid and hexamethylenediamine. The product is made by interfacing technique.