Poly amides:
There are 2 types of polyamides such as-
1. Aliphatic poly-amides.
2. Aromatic poly-amides.
1. Aliphatic poly-amides:
Aliphatic poly-amides are called nylons. Nylons are designated by the number of carbon in the chain, there are different types of nylon. Such as -
A) Nylon - 6,6
B) Nylon - 6,10
A) Nylon - 6,6:
Nylon - 6,6 is obtained from the reaction of hexa-methylene-diamine & adipic acid.
The product obtained is known as nylon 6,6. As there are six carbon atoms in di-amine & six carbon atoms in di-acid.
B) Nylon - 6,10:
Nylon - 6,10 is obtained from hexa-methylene diamine & sebacic acid.
The product obtained is known as nylon - 6,10 as there are six carbon atoms in di-amine and 10 carbon atoms in di-acid.
2. Aromatic polyamides:
A) NomexTM:
NomexTM is obtained from the reaction of Isophtaloyl-Chloride & m-phenylene-di-amine.
B) KevlarTM:
KevlarTM is obtained from the reaction of 1,4- phenylene-di-amine & tere-phthaloyl-chloride.
Properties of Poly Amides:
1. They are thermoplastic polymer.
2. Low moisture absorption.
3. Nylon gets attacked by mineral acids.
4. Highly elastic.
5..Good electrical resistance.
6. Resistance to alkali.
7. Insoluble in most organic solvents.
8 Compatible with wool & cotton.
Application of Poly amides:
A) Nylon-6,6:
1/ Used in the production of tyre-cord.
2/ Used in the manufacture of carpet, nope, thread, fibre, cloth, etc.
B) Nylon-6,10:
1/ Used for mono-filaments of brushes.
2/ Used for Sporting equipments.
C) NomexTM:
1/ Used as flame resistance cloth.
2/ Used in hot gas filtration equipment.
D) KevlarTM:
1/ Used in bullet resistant vests.
2/ Used in manufacturing of fibre.