Polyamide 6 and Polyamide 66
Nylon or Polyamide is an engineering polymer offering excellent toughness and also abrasion resistance.
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Stiff, strong and tough but have poor creep resistance
Low friction and good wear resistance
Good solvent resistance at room temperature but the hydrogen bonding encourages moisture uptake (up to 8%). The absorbed water acts as a plasticiser and improves impact strength
Show low permeability of oxygen Are translucent to opaque
Polyamides make very good fibres (tough and extensible).
Polyamides are prone to oxidation and yellowing in sunlight.
Resistant to oils, fuels, benzene, alkaline solutions, solvent, chlorinated hydrocarbons, esters and ketones.
Not resistant to ozone, hydrochloric acid, sulphuric acid and hydrogen peroxide.
Automotive parts include door handles, air intake manifolds and radiator grills.
Low Voltage Switch Gears including: fuses, contactors, miniature circuit breakers, switches and relays Gears and bearings
- Fuel tanks
Polyamides (nylons) are a family of linear chain polymers.
The lower code number members (polyamide 6 and polyamide 6.6) have a higher concentration of amide link groups than the high code number members (polyamide 11 and polyamide 12).
Polyamides with a higher concentration of amide links are more polar than the high code number polyamides, which tend towards the properties of polyethylene.
Higher concentrations of amide links encourage cross-linking through hydrogen bonding. The lower the code number the higher the degree of crystallinity. The simple chain structure has reasonable flexibility and the glass transition temperature (Tg) will be 50°C and lower for the high code numbers
Flammable with a blue flame and a yellow rim to it. It continues to burn after the ignition source has been removed. When burnt it will froth and produce stringing drips. It smells like burnt horn.
Density – 1.14 g/cm ³
Pre-Drying – 4 hours at 80°C in a dehumidifying hot air drier, unless taken directly from a hermetically sealed bag. .PA is hygroscopic and so will absorb moisture if left in unsealed bags or containers.
Melt temperature – PA 6: 240-250 °C / PA 66: 270-290 °C
Mould Temperature – PA 6: 60-100 °C / PA 66: 60-100 °C
Shrinkage – PA 6: 0.7-2.0 % , if glass filled then 0.3-0.8 % / PA66: 0.7-2.0 % , if glass filled then 0.4-0.7 %
Trade Names And Manufacturers
Akulon – DSM
Durethan – Lanxess
Polytron – Polytron Kunststofftechnik
Ultramid – BASF
Zytel – DuPont
Plustek – Polyram
Rilsan _ Arkema
Technyl – Solvay
Vydene – Ascend Performance Materials
Hardie Polymers can help source grades from all of the above manufacturers
Wallace Carothers of DuPont discovered polyamide 6.6 in 1931. In October 1938 commercial production of nylon 6,6 began. The first commercial application were for the bristles for the Miracle Tuft toothbrush. The following year, nylon stockings became available and were a sensation at the World’s Fair in New York City
Nylon 6 was developed in the 1940’s (largely as a consequence of the patent that existed on Nylon 6,6). With the start of World War II, nylon was then commandeered for war purposes for example, to make canopies for parachutes. Nylon for injection moulding did not begin until the 1950’s.
More about Polyamides
Articles by Dr Charlie Geddes
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