Nylon, also known as polyamide (PA), is a general term for thermoplastic resins characterized by repeating amide groups [-NHCO]- in their molecular backbone. This includes aliphatic PA, aliphatic-aromatic PA, and aromatic PA. Among them, aliphatic PA has a wide variety, high production, and broad applications, with its naming determined by the specific number of carbon atoms in the synthetic monomer.

Nylon boasts numerous properties, thus finding extensive applications in automotive, electrical equipment, mechanical components, transportation tools, textiles, and papermaking machinery. With the miniaturization of vehicles, the high-performance of electronic and electrical equipment, and the rapid lightweighting of machinery and equipment, the demand for nylon will be even greater. Particularly, as a structural material, nylon is subject to high requirements for its strength, heat resistance, and cold resistance.

Nylon's inherent disadvantages are also significant factors limiting its applications, particularly for the two major varieties, PA6 and PA66. Compared to PA46, PAl2, and others, they offer a strong price advantage, although certain properties may not meet the requirements of related industries. Therefore, it is necessary to expand its application fields by modifying certain properties for specific application areas. Due to PA's strong polarity, it has high moisture absorption and poor dimensional stability, but these can be improved through modification.