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[Chemical Knowledge]：Properties and Uses of Poly (hexamethylene adipamide)

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Poly (hexamethylene adipamide) (Polyhexamethylene Adipamide, referred to as PA66) is an important chemical raw material, widely used in plastics, fibers and engineering materials and other fields. The properties and uses of polyhexamethylene adipamide are described in detail in this paper.

1. Properties of Polyhexamethylene Adipamide

1. Structural Characteristics: Polyhexamethylene Adipamide is a linear polymer compound formed by the polycondensation reaction of adipic acid and hexamethylene diamine. Its molecular chain contains a large number of amide groups (-CO-NH-), which gives poly (hexamethylene adipamide) unique physical and chemical properties.
2. Physical Properties: Polyhexamethylene adipamide is usually a white or yellowish crystalline powder with a high melting point (about 250-260 ℃) and density (about 1.14-1.15g/cm³). It has good heat resistance, abrasion resistance, dimensional stability and low moisture absorption.
3. Chemical properties: poly (hexamethylene adipamide) has excellent chemical resistance and can resist the erosion of most organic solvents, acids, alkalis and salts. At the same time, it also has good oxidation resistance and UV resistance.

2. poly hexamethylene adipamide use

1. engineering plastics: poly hexamethylene adipamide can be used as engineering plastics for the manufacture of a variety of high-performance products, such as auto parts, electrical parts, mechanical parts and so on. Its excellent heat resistance, wear resistance and dimensional stability make it perform well under high temperature, high pressure and high load working environment.
2. Fiber material: Poly (hexamethylene adipamide) can be used to produce synthetic fibers, such as nylon yarn, nylon cloth, etc. These fiber materials have the characteristics of high strength, high toughness and wear resistance, and are widely used in clothing, industrial textiles and other fields.
3. Other fields: In addition to the above fields, polyhexamethylene adipamide can also be used in the production of adhesives, coatings, inks and other products. At the same time, it can also be used as an additive to improve the performance of other materials.

In short, as an important raw material for chemical production, poly (hexamethylene adipamide) has been widely used in the fields of plastics, fibers and engineering materials. Due to its unique physical and chemical properties, polyhexamethylene adipamide provides excellent performance and service life for products in various industries. With the continuous progress of science and technology, the application field of polyhexamethylene adipamide will be further expanded, bringing more contributions to human life and development.

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