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Polyacrylonitrile

PROPERTIES OF POLYACRYLONITRILL

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PAN is a semi crystalline polymer of the linear formula (C3H3N) n. Although it is thermoplastic, it does not melt under normal conditions. It degrades before melting and its melting is only observed above 300 ° C if the heating rate is 50 degrees per minute or more. Almost all of the PAN produced for commercial applications are copolymers made from monomer mixtures with acrylonitrile as the main component. PAN when heated to 200ºC turns into a rigid structure with great energy release, a phenomenon known as cyclization. Above this temperature is oxidized making it non-flammable. If heated to above 1000 degrees under inert atmosphere yields a product of greater than 90% carbon. This property is used for carbon fiber production.

Among its main characteristics that make it special in relation to other polymers we can highlight:

- It is the most resistant polymer among all to degradation by sunlight, mainly by the ultraviolet rays.

- It is very inert and resistant to most organic solvents and acids, being only attacked by highly polar liquids and concentrated solutions of bases.

- Its fibers are resistant to breaking, produce high volume, are soft, comfortable and thermal insulation, giving properties similar to natural wool.

- In the form of fibers, when heated, it does not melt and maintain its morphological structure, property that is used for the production of carbon fiber, insulation fibers, flame retardant fibers and blankets for filtration of hot gases.

Chemical formula
IUPAC Name
Polycylonitrile
CAS Number
25014-41-9
Structure
Centesimal composition
C 67,91%, H 5,7%, N 26,4%
Aparência
White solid
Density
1,184 g/cm³
Melting Point
Above de 300ºC
Boiling Point
Degraded
Temperature Glass transition
Approx. 95ºC
Solubility in water
Insoluble
Solvents
Polar solvents such as Dimethylformamide, Dimethylacetamide, Ethylene Carbonate, Propylene Carbonate, Sodium Thiocyanate, Zinc Chloride, Nitric Acid





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