Place Of Origin: China
| Selling Units | : | Kilogram |
Textile Polyamide/Nylon Filament
Commonly used nylon fibers can be divided into two categories.
One is the polydiacid diamine obtained by polycondensation of diamine and diacid, and the chemical structural formula of its long-chain molecule is:
Polyamide filament
H-[HN(CH2)xNHCO(CH2)yCO]-OH
The relative molecular weight of this kind of nylon is generally 17000-23000. Depending on the number of carbon atoms of the diamine and dibasic acid used, different nylon products can be obtained, which can be distinguished by the number added after the nylon, where the former number is the carbon number of the diamine, and the latter number is The number of carbon atoms in the dibasic acid. For example, nylon 66 indicates that it is obtained by the polycondensation of hexamethylene diamine and adipic acid; nylon 610 indicates that it is obtained from hexamethylene diamine and sebacic acid.
The other type is obtained by lactam polycondensation or ring-opening polymerization, and the chemical structural formula of its long-chain molecule is:
H-[NH(CH2)xCO]-OH
According to the number of carbon atoms contained in its unit structure, different varieties can be named. For example, nylon 6 shows that it is obtained by ring-opening polymerization of caprolactam containing 6 carbon atoms.
Nylon 6, Nylon 66 and other aliphatic nylons are composed of linear macromolecules with amide bonds (-NHCO-). There are -CO- and -NH- groups in the nylon molecule, which can form hydrogen bonds between molecules or within the molecule, and can also be combined with other molecules, so nylon has better hygroscopic ability and can form a better crystalline structure.
The -CH2-(methylene group) in the nylon molecule can only generate weak van der Waals force, so the molecular chain of the -CH2- segment has a larger degree of curling. Due to the different number of -CH2-, various nylons have different intermolecular hydrogen bonds, and the probability of molecular curling is also different. In addition, some nylon molecules are also directional. The orientation of the molecules is different, and the structural properties of the fibers are not exactly the same.Carbon fiber nylon filament
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