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Nylon is a family of synthetic polymers with amide backbones, ... The molecular weight of nylon products so attacked drops, and cracks form quickly at the affected ...
Nylon 66 (loosely written nylon 6-6, nylon 6/6, nylon 6,6, or nylon 6:6) is a type of polyamide or nylon. It, and nylon 6 , are the two most common for textile and plastic industries. Nylon 66 is made of two monomers each containing 6 carbon atoms, hexamethylenediamine and adipic acid , which give nylon 66 its name. [ 1 ]
Nylon 6 or polycaprolactam is a polymer, in particular semicrystalline polyamide. Unlike most other nylons , nylon 6 is not a condensation polymer , but instead is formed by ring-opening polymerization ; this makes it a special case in the comparison between condensation and addition polymers .
When he discovered the more valuable nylon 66, the development of nylon 46 was shelved. In 1977, pale to white high-molecular-weight nylon 46 (Mw = 45,000, inherent viscosity 2.09 in 98% formic acid at 30 °C) was produced through a solid-state polymerization (SSP) technique by Gaymans et al., [3] which gave hope to industrialization of nylon 46.
Nylon 12 exhibits properties between short chain aliphatic nylons (e.g., nylon 6 and nylon 66) and polyolefins. [3] At 178-180 °C, the melting point of nylon 12 is the lowest among the important polyamides. Its mechanical properties, such as hardness, tensile strength, and resistance to abrasion, are similar to those of nylon 6 and nylon 66.
The DuPont evaluations of the 1950s era indicated that polyamide-1,6 was less acid stable than nylon 66, and melts over 300–325 °C, with some decomposition. However, films were reported to have been successfully pressed at 275–290 °C. Molecular weight determined to be ~22,000–34,000 via an osmotic pressure method. [3]
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Nylon 11 is seen to have increased dimensional stability in the presence of moisture due to its low concentration of amides. Nylon 11 experiences 0.2-0.5% length variation and 1.9% weight variation after 25 weeks of submersion in water in comparison to 2.2-2.7% elongation variation and 9.5% weight variation for Nylon 6. [2]