What are the types of organic fiber boat ropes?

2023-11-30 10:45:51

Aramid rope has outstanding high-temperature mechanical properties and is suitable for high-temperature application scenarios. Compared with aramid, polyarylate fiber has excellent creep resistance and is suitable for long-term load conditions. Ultra-high molecular weight polyethylene rope has very excellent tensile strength, but is very sensitive to high temperatures and loads. Polyimide fiber has outstanding radiation resistance and thermal stability, and is one of the ideal materials to replace aramid. The performance characteristics of four high-performance organic fibers provide guarantee for meeting the needs of fiber materials for braided ropes.

The full name of polyarylate fiber is liquid crystal polyarylate (LCP) fiber, which is made from the condensation polymerization of 4-hydroxybenzoic acid and 2-hydroxy-6-naphthoic acid. Compared with aramid, polyarylate fibers have excellent creep resistance and chemical stability. Polyarylate fiber has been used in the landing buffer airbags of the Spirit and Opportunity Mars rovers and the landing brake ropes of the Curiosity Mars rover. In the future, it is expected to be used in Mars exploration equipment such as Mars suits, inflatable landing reducers and habitation modules. However, polyarylate fibers will undergo significant performance degradation after being irradiated by ultraviolet rays, which limits their application in space inflatable structures such as stratospheric airships.

The full name of aramid fiber is aromatic polyamide fiber. The outstanding advantage of aramid rope is that it still maintains excellent mechanical properties at a high temperature of 170 degrees Celsius. Aramid-reinforced composite materials can be used in radar radomes, rocket fairings, engine casings, etc. to effectively reduce structural quality while improving performance. However, the interface bonding strength between aramid fiber and resin or rubber matrix needs to be improved, and collaborative modification by plasma, biological enzymes and other methods is one of the main development directions in the future.

Polyimide (PI) fiber is mainly synthesized from two monomers: dianhydride and diamine. The molecule contains a large number of aromatic groups connected to imide bonds. Therefore, polyimide fiber has excellent thermal stability. , radiation resistance and dielectric insulation properties, often used in spacecraft lightweight insulation materials, structural materials and radiation protection materials, etc. In recent years, with the development of high-strength and high-modulus PI fiber, its strength and modulus are superior to aramid fiber, and it has huge application potential in spacecraft load-bearing structures.

Ultra-high molecular weight polyethylene (UHMWPE) fiber is polymerized from polyethylene monomer, with a relative molecular mass between 3.5 million and 7.5 million. UHMWPE fiber density is only 0. 97 g/cubic centimeter, and its specific strength can reach 370cN/tex. It is currently an organic fiber with the highest specific strength. UHMWPE fiber is often used in lightweight bulletproof materials and marine ropes. Due to the weak force between its molecular chains, it is easy to deform under high temperature and external force. Therefore, the creep modification of ultra-high molecular weight polyethylene marine ropes has been one of the research hotspots in recent years.

High-performance fiber ropes have special physical and chemical properties and play an important role in the fields of national defense, military industry, aerospace and other fields. They are an important strategic material. According to different chemical compositions, high-performance fiber ropes can be divided into two categories: inorganic and organic. Compared with inorganic fibers represented by carbon fibers, organic fibers have better wear resistance and weavability. Therefore, most ropes are made of organic fibers. Organic high-performance fiber ropes mainly include aromatic fibers represented by aramid, polyarylate and polyimide and olefin fibers represented by ultra-high molecular weight polyethylene ropes.