What is polyacrylonitrile fiber? How is it different from polyester, polypropylene, and nylon?

polyacrylonitrile fiber, also known as acrylic fiber, is a synthetic fiber made from the polymer of polyacrylonitrile. It has a texture similar to wool and is often used as a substitute for wool, widely used in knitting, thermal fabrics, and other fields. Below, we will compare its differences with polyester, polypropylene, and nylon from the aspects of raw material characteristics, performance emphasis, and application directions.

Raw materials and basic characteristics are different

The main body of acrylic fiber is the polyacrylonitrile system. The fiber has good loftiness, outstanding heat insulation performance, a soft and smooth feel, and significant advantages in sun resistance. Polyester belongs to polyester fibers, with stable molecular structure, a stiff fabric, good anti-wrinkle performance, and is not prone to deformation. The raw material of polypropylene is polypropylene, with a low density, fast water repellency and quick drying, and light weight. Nylon is a polyamide fiber, with strong toughness, excellent wear resistance and rebound performance, and is not prone to breakage under force.

Application and weaknesses have different emphases

Acrylic is suitable for sweaters, scarves, and outdoor thermal fabrics. Its weakness is poor moisture absorption, and the feel changes significantly when exposed to water. It has weak wear resistance and is not suitable for high-frequency friction scenarios. Polyester has a wide range of applications, commonly seen in clothing and home textiles, but has average moisture absorption and breathability, and is prone to sweating and dampness when worn continuously. Polypropylene is lightweight, conducts moisture quickly, and is often used in sports close-fitting fabrics and straps. Its heat resistance is weak. Nylon has strong toughness, excellent wear resistance and elasticity, and is often used in underwear, socks, and industrial straps. It is prone to aging and fading in the sun environment.

Selection can be simply distinguished: for Fluffy and warm, resistant to sun exposure， choose acrylic； for anti-wrinkle and shape retention， priority should be given to polyester； for lightweight and quick-drying， choose polypropylene； for high-frequency friction and need for flexibility and elasticity， prioritize nylon. These four fibers have their own weaknesses. Many fabrics use blending methods to complement performance and balance comfort and durability. Before purchasing， it is recommended to conduct sample testing based on the fabric application to match product requirements.

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