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The crystal structure of polyacrylonitrile

✍ Scribed by B.G. Colvin; P. Storr

Publisher
Elsevier Science
Year
1974
Tongue
English
Weight
311 KB
Volume
10
Category
Article
ISSN
0014-3057

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✦ Synopsis

Abstraet--Polyacrylonitrile (PAN) has been prepared by a free-radical mechanism using azobisisobutyronitrile as the initiator. Fibres were produced by extruding a solution of this polymer into dilute sodium thiocyanate. Wide-angle X-ray analysis showed that the resulting fibres exhibited a moderate degree of crystalline order. An orthorhombic unit-cell has been proposed to account for the observed reflections, the cell constants are: a= 21.48 + 0"02 A; b = 11-55 _ 0.03 A; c = 7"096 _ 0-003 A. A helical structure has been proposed for PAN with four monomer units per crystallographic repeat. The probability of a syndiotactic configuration has been suggested to account for the meridional reflections; the calculated density of the proposed cell (1-199 gcm-3) was found to agree very well with values quoted in the literature.

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