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Effect of copolymerization on the crystalline structure of polyacrylonitrile

✍ Scribed by A.K. Gupta; N. Chand

Publisher
Elsevier Science
Year
1979
Tongue
English
Weight
367 KB
Volume
15
Category
Article
ISSN
0014-3057

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✦ Synopsis

X-ray diffraction of polyacrylonitrile (PAN), poly-2-hydroxyethyl methacrylate (POly-HEMA) and their random copolymers containing low proportions of HEMA has been carried out in order to investigate the changes in the PAN structure produced by introducing some HEMA units into the chain. Both crystalline and amorphous phases were distinguishable in PAN and the copolymers. Considerable decrease in crystallinity on copolymerization was found, but not showing any quantitative relationship with the HEMA content. The crystalline lattice in the copolymers remained similar to that of PAN" A two-phase (crystalline and amorphous) structure of PAN was found more suitable to explain the results.

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The crystal structure of polyacrylonitri
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✍ B.G. Colvin; P. Storr πŸ“‚ Article πŸ“… 1974 πŸ› Elsevier Science 🌐 English βš– 311 KB

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