PBO and Kevlar are both excellent fibers which are wide used in many industries. The two have different ingredients, different characteristics, different advantages, and different uses.
Kevlar is a well-known material in the world. It was originally recognized by the world for its use in body armor. But in fact, this magical synthetic material has many characteristics and is widely used in all aspects of our lives! Kevlar fiber is a kind of aramid fiber composite material developed by DuPont in the United States in 1965 by Polish-American chemist Stephanie Kwollerk. Because Kevlar fiber has the characteristics of low density, high strength, good toughness, high temperature resistance, easy processing and molding, which has attracted people's attention.
In the shear test of paper, leather, and Kevlar, we can see that Kevlar fibers cannot be cut with scissors at the same thickness. In addition to tear resistance, high abrasion resistance, and shear resistance, Kevlar has the following characteristics:
Permanent heat resistance and flame retardancy
Permanent acid and alkali resistance
In case of fire, no molten droplets are generated and no toxic gas is generated
Thicken the cloth surface when it is burnt to enhance the sealing performance without cracking
According to tests, it is not only able to withstand cutting by cutters, but also withstand armor-piercing bullets much better than FRP and steel armor. Kevlar material is used to replace nylon and fiberglass. Under the same conditions, its protective ability can be at least doubled, and it has good flexibility and comfortable wearing. The body armor made of this material weighs only 2 to 3 kilograms and is easy to move. Therefore, it has been widely used by the military and police forces.
PBO fiber is short for Poly-p-phenylene benzo isoxazole fiber (Poly-p-phenylene benzo isoxazole). It is a reinforced material for composite materials developed by the United States for the development of aerospace industry in the 1980s. One of the most promising members of the cycloramic polyamide family, known as the 21st century super fiber.
The strength of PBO fiber products is 5.8GPa and the modulus is 280GPa, the highest among the existing chemical fibers; the heat-resistant temperature reaches 600 ° C, the limiting oxygen index is 68, and it does not burn or shrink in the flame, and has heat resistance and flame resistance Higher than any other organic fiber. PBO fibers are excellent in impact resistance, friction resistance, and dimensional stability, and they are light and soft, making them ideal textile materials.
As a super-performance fiber of the 21st century, PBO has very good physical and mechanical properties and chemical properties. Its strength and modulus are twice that of Kevlar fibers, and it has the heat resistance and flame retardancy of meta-aramid. The physical and chemical properties completely exceed the Kevlar fiber that has been a leader in the field of high-performance fibers so far.
In recent years, high-performance fiber composite reinforcement materials have been widely used in high-rise buildings, large bridges, marine engineering and other construction fields in developed countries such as Europe, America, and Japan. The bearing capacity and seismic resistance of the structure. In addition, in terms of bridge construction, steel wire ropes cannot be used for long bridges due to their own weight. It is desirable to use light weight and high strength cables. Cables made of PBO fiber with high specific strength and good dimensional stability are best s Choice.