Nylon is a kind of polyamide fiber (cotton fiber). Definition of polyamide: polymer with repeated structure unit amide group in the main chain of macromolecule.The English name is polyamide, abbreviated as PA, commonly known as nylon.The appearance of nylon has changed the appearance of textiles. Its synthesis is a major breakthrough in the synthetic fiber industry and an important milestone in polymer chemistry.

There are many kinds of polyamides, including PA6, PA66, PA11, PA12, PA610, pa612, PA1010, PA46, nylon 6T, nylon 9t and mxd-6. Polyamide can be prepared by amino acid polycondensation, ring opening polymerization of lactam or polycondensation of corresponding dicarboxylic acid and diamine.

Properties of nylon

Nylon ranks first in engineering plastics in terms of production and has become an indispensable material in various industries

（1）Excellent mechanical properties, high mechanical strength, good toughness.

（2）It has good self lubrication and friction resistance, so it has long service life as a transmission part.

（3）The thermal deformation temperature of PA46 and other crystalline nylon is very high, which can be used at 150 ℃ for a long time. The thermal deformation temperature of PA66 reinforced by glass fiber can reach 250 ℃.

（4）Excellent electrical insulation properties, nylon volume resistivity is very high, is an excellent electrical, electrical insulation materials.

（5）Excellent weather resistance

（6）High water absorption, saturated water up to 3%, to a certain extent, affect the dimensional stability of the parts.

Main types of nylon

1、The scientific name of nylon 6 is polycaprolactam, and the structural formula is as follows:

2、Nylon 66 has the scientific name of poly (hexylidene adipate amide) or poly (hexanediamide), abbreviated as PA66, and the structural formula is as follows:

3、Nylon 1010 (PA1010), academic name: polyadecane decadecadecamide or polydecanyl decanediamine, with the structure formula as follows:

4、Nylon 11 (PA11), known as polyundecyllactam, is a long carbon chain soft nylon prepared from aminoundecanoic acid. The structural formula is as follows:

5、Nylon 12 (PA12), scientific name: polydodecanolactam, structural formula:

6、Nylon 46 (PA46), scientific name: polyhexanediamide, structural formula:

7、Nylon 610 (PA610), scientific name: polydecanediohexanediamide, structural formula: PA610, PA610

8、Nylon 612 (pa612), pa612 scientific name: polydodecyl hexanediamine, the structural formula is:

Semi aromatic nylon

9、The molecular formula of nylon mdx6 is as follows

10、The chemical structure formula of nylon 6T is as follows

11、The chemical structure formula of nylon 9t is as follows

12、Transparent polyamide, scientific name: poly (p-phthaloyltrimethylhexanediamine), chemical structural formula is:

The main kinds of nylon are introduced here. There are many kinds of nylon that need to be explored.