Question

How are Buna-s and nylon-6, 6 prepared? Give their uses.

Answer 1

Hint: Buna-s and nylon-6,6 are the synthetic polymers. They can be prepared by the polymerization reaction of their respective monomers. Polymer is a chain with more than 1000 monomers in its structure. The preparation of a polymer from monomers is called polymerization.

Complete step by step answer:
In the question it is given that to prepare Buna-s and nylon-6,6 polymers.
-First we should know the monomeric units to prepare Buna-s and nylon-6,6.
Buna-S
-The monomers used to prepare Buna-S polymer are 1,3-butadiene and styrene.
-The structures of 1,3-butadiene and styrene are as follows.

-The preparation of Buna-S is as follows.

-In the above reaction 1,3-butadiene reacts with styrene in presence of sodium metal and forms Buna-S.

Uses of Buna-S:
-Buna-S is widely used in coated papers.
-It is used as building applications like as a sealing and binding agent
-Moreover it is used in rubber cutting boards.

Nylon-6,6

-The monomers used to prepare Nylon-6,6 are adipic acid and hexamethylenediamine.
-The structures of adipic acid and hexamethylenediamine are as follows.

-The preparation of Nylon-6,6 is as follows.

-Nylon-6,6 is prepared by condensation polymerization of hexamethylene diamine with adipic acid at high temperature and pressure.

Uses of Nylon-6,6:
It is used in fabrication sheets, bristles for brushes.
Nylon-6,6 is waterproof in nature, so it is used to make swimwear.

Note: Buna-s is prepared through addition polymerization reactions of 1,3-butadiene and styrene. Nylon-6,6 is prepared by the condensation polymerization of adipic acid and hexamethylenediamine. In addition reaction there is no formation of side products but in condensation polymerization there is a formation of side products like methanol and water.