Applications of Nylon

Although the nylon-3 fibers exhibited properties quite similar to that of silk, the nylon-3 fibers have not yet been eommereialized. At present, various applications of nylon-3 are being investigated, but the only commercially available application is as a stabilizer for polyoxymethylene. 

As the stabilizer for polyoxymethylene, the copolyamide (nylon 6-66-10) was known to be a formaldehyde scavenger. Recently, the Asahi Chemical researchers determined that nylon-3 was an excellent stabiUzer for polyoxymethylene2 [3]. Because nylon-3 has a high amide concentration, it appeared to be an excellent formaldehyde scavenger. At present, nylon-3 is commercially produced only at Asahi Chemical as the stabilizer for polyoxymethylene. Several proposals for the production of nylon-3, which is suitable for the stabilization of polyoxymethylene, have also been prqxtsed [24], 

An advantage of using nylon-3 as a stabilizer for polyoxymethylene is that nylon-3 exhibits excellent thermal stability because of its high amide concentration. Furthermore, a polymer composition which contains nylon-3 shows negligible decoloration when the polymer melt remains in an injection machine for a long time. Also nylon-3 does not deposit onto the surface of the injection mold because of its high melting point. These three points are the characteristic merits of nylon-3 for this application. 

Masamoto Poly- P-alanine Fiber, Polyaminoacids - Application and 

Munoz-Guerra, J. M. Fernandez, A. Rodriguez-Galan, J. Subirana  

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Extruded applications of nylon, other than film and monofilcunent, are less commonly encountered because of the low melt viscosity of the polymers. Uses include cable sheathing which requires resistance to abrasion and/or chemical attack, flexible tubing for conveying petrol and other liquids, piping for chemical... 

Typical applications for nylon include small gears, bearings, bushes, sprockets, housings for power tools, terminal blocks and slide rollers. An important design consideration is that nylon absorbs moisture which can affect its properties and dimensional stability. Glass reinforcement reduces this problem and produces an extremely strong, impact resistant material. Another major application of nylon is in fibres which are notoriously strong. The density of nylon is about 1100 kg/m. ... 

Problem 5.12 For some applications of nylon-6,6, it is desirable to have M,j below 20,000. For maldng the polymer by polycondensation of hexamethylene diamine and adipic acid, how much of acetic acid per mol of adipic acid should be added so that does not exceed this value Use both the approaches I and II for the calculation. 

Nylon first found wide use in textiles and carpets. Because it is resistant to stress, it is now used in many other applications, such as mountaineering ropes, tire cords and fishing lines, and as a substitute for metal in bearings and gears. The extended applications of nylon precipitated a search for new super fibers with super strength and super heat resistance. 

Nylons are used in applications requiring durability, toughness, chemical inertness, electrical insulating properties, abrasion and low frictional resistance, and self-lubricating properties. Table 15.13 lists markets and typical applications of nylons. In many of these applications, nylons are used as small parts or elements in subassemblies of the finished commercial article. 

Example 15.5 Indicate the polymer property/properties required for the following applications of nylons ... 

The most important application of nylons is as fibers, which account for nearly 90% of the world production of all nylons. Virtually all of the rest is used for plastic applications. Because of their high cost, they have not become general-purpose materials, such as polyethylene and polystyrene, which are available at about one-third the price of nylons. Nylons have nevertheless found steadily increasing application as plastics materials for specialty purposes where the combination of toughness, rigidity, abrasion resistance, reasonable heat resistance, and gasoline resistance is important. 

The largest plastics applications of nylons have been in mechanical engineering [ 14]—nylon-6, nylon-... 

Besides film, other extruded applications of nylons are as monofilaments, which have found applications in surgical sutures, brush tufting, wigs, sports equipment, braiding, outdoor upholstery, and angling. 

The most important application of nylons is in production of synthetic fibers. Nylon fibers are largely produced in the form of continuous filament yam and staple fiber. Since fibers should simultaneously possess crystallization and... 

Typical applications of nylon-based plastics also include fasteners for interior and exterior components, a host of coimectors, holding fixtures (Figure 17), and radiator end caps. These applications rely on the ductility and toughness of impact-modified nylon 6,6 as a mechanism to cormect assemblies or to attach components together. 

The vast majority of SPS/nylon blends to date have been formulated using nylon 6 and nylon 6,6. nylon 6 and nylon 6,6 have essentially the same properties the difference is in the way these nylons are synthesized. Nylon 6 is made by ring opening polymerization of the monomer caprolactam, while nylon 6,6 is made from two monomers adipoyl chloride and hexamethylene diamine. The synthesis, properties, and applications of nylons are described in [1],... 

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