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(organic chemistry)
Polymer of acrylonitrile; semiconductive; used like an inorganic oxide catalyst to dehydrogenate tert-butyl alcohol to produce isobutylene and water.



a linear polymer [-CH2-CH(CN)—]n of acrylonitrile; an amorphous white substance. Molecular weight, 30,000–100,000; and density, 1.14–1.15 g/cm3 (20°C). Does not soften up to almost 230°C (degradation takes place above this temperature). Polyacrylonitrile is comparable in strength to polyamides (for example, nylon). Its relative elongation is 10–35 percent, its water absorption is 0.9–1.0 percent at 20°C and 65 percent relative humidity.

Polyacrylonitrile is chemically resistant to the action of ordinary solvents and fats and is not altered by atmospheric conditions and sunlight. It dissolves, for example, in dimethylforma-mide, dimethylacetamide, and ethylene carbonate, in concentrated aqueous solutions of the salts LiBr, NaCNS, Ca(CNS)2, and ZnCl2 + CaCl2; and in concentrated nitric and sulfuric acids.

In industry, polyacrylonitrile is produced by radical polymerization of the monomer in an aqueous medium or in aqueous solutions of salts. Polyacrylonitrile is used mainly for producing high-quality textile polyacrylonitrile fibers.


See References under POLYMERS.


References in periodicals archive ?
The three solutions were cellulose acetate (CA), polyacrylonitrile (PAN) and polyvinyl chloride (PVC).
Oxidative stabilisation: The polyacrylonitrile precursor is first stretched and simultaneously oxidized in a temperature range of 200-300[?
Kowalewski, "Well-Defined Polyacrylonitrile Copolymers Prepared by Various CRP and their Applications as Nanostructured Carbons," Polym.
Preparation of hydrophilic polyacrylonitrile dialysis blend membranes for ultrafiltration, J.
The Australian Wool Testing Authority sells a 'multifibre fabric' which contains strips of wool, polyacrylonitrile, polyester, nylon, cotton and cellulose acetate and which is used for testing dyes.
A piece of polyacrylonitrile HF membrane was sheathed by 2 pieces of one-eighth inch outer diameter Teflon tube.
Polymers like calcium alginate and poly lysine for pancreatic islets, hepatocytes, parathyiod cells, fibroblasts; polyacrylonitrile and polyvinyl chloride for thymic cells and adrenal cells; polyacrylates and alignates for erythrocytes etc.
It is not a chemically-treated material, rather a yarn created by spinning oxidized polyacrylonitrile fiber with an Aramid strengthening agent.
Spun at high temperature from strands of the polymer polyacrylonitrile, carbon fiber's combination of strength, lightness, and relative imperviousness to heat and cold has landed it a role in the Space Shuttle's nosecone and countless satellites.
According to Professor Kumar, matrix systems studied to date include poly(p-phenylene benzo bisoxazole) (PBO), polypropylene (PP), poly (vinyl alcohol) (PVA), poly(methyl methacrylate) (PMMA), and polyacrylonitrile (PAN).
Polyacrylonitrile (PAN) Carbon Fiber-Restriction to Domestic Sources (DFARS Case 2004-D002)