This MedLibrary.org supplementary page on Nylon 6-6 is provided directly from the open source Wikipedia as a service to our readers. Please see the note below on authorship of this content, as well as the Wikipedia usage guidelines. To search for other content from our encyclopedia supplement, please use the form below:
Related Sponsors
Nylon 6-6, also referred to as nylon 6,6, is a type of nylon. Nylon comes in many types, the two most common for textile and plastics industries are: nylon 6 and nylon 6,6.
Contents |
Composition
Nylon 6,6 is made of hexamethylene diamine and adipic acid, which give nylon 6,6 a total of 12 carbon atoms, and its name.
Physical Properties
1. Nylon 6,6 has a melting point of 256°C, high for a synthetic fiber, though not a match for polyesters or aramids such as Kevlar.1 This fact makes it the most resistant to heat and friction and enables it to withstand heatsetting for twist retention.
2. Its long molecular chain results in more sites for hydrogen bonds, creating chemical “springs” and making it very resilient.
3. It has a dense structure with small, evenly spaced pores. This means that nylon 6,6 is difficult to dye, but once dyed it has superior colorfastness and is less susceptible to fading from sunlight and ozone and to yellowing from nitrous oxide.
Manufacture
1. Hexamethylene diamine and adipic acid are combined with water in a reactor. This produces nylon salt. The nylon salt is then sent to an evaporator where excess water is removed.
2. The nylon salt goes into a reaction vessel where a continuous polymerization process takes place. This chemical process makes molten nylon 6,6.
3. The molten nylon 6,6 undergoes a spinning process, where the nylon 6,6 is extruded and sent through a spinnerette, which is a small metal plate with fine holes. The nylon is then air-cooled to form filaments.
Applications
- Carpet fiber
- Apparel
- Airbags
- Tires
- Ropes
- Conveyor Belts
- Hoses
Nylon 6,6's longer molecular chain and denser structure qualifies it as a premium nylon fiber, specified most often by professional architects and designers for use in commercial settings like offices, airports, and other places that get a lot of wear and tear. It is also an excellent choice for residential carpet applications.
References
- ^ Dupont. "Kevlar technical guide" accessed 2008-07-10
Wikipedia content modification information:
- This page was last modified on 25 November 2008, at 23:23.
Wikipedia Authorship and Review
Wikipedia content provided here is not reviewed directly by MedLibrary.org. Wikipedia content is authored by an open community of volunteers and is not produced by or in any way affiliated with MedLibrary.org.
Wikipedia Usage Guidelines
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article on "Nylon 6-6".
The URL for this specific entry is:
All Wikipedia text is available under the terms of the GNU Free Documentation License. (See Copyrights for details). Wikipedia® is a registered trademark of the Wikimedia Foundation, Inc.