Conclusions
The shrinkage of polyacrylonitrile fibres in air at 130–170°C, and also in steam or boiling water is connected with the formation of ordered structures due to a redistribution of the interacting CN groups.
Shrinkage of fibres in air at temperatures below 130°C is caused only by disorientation of the macromolecule chains.
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Additional information
Translated from Khimicheskie Volokna, No. 4, pp. 26–27, July–August, 1988.
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Fedotov, S.I., Molotkov, A.P. & Slyvakov, V.E. Molecular mechanism of shrinkage of polyacrylonitrile fibres. Fibre Chem 20, 270–272 (1989). https://doi.org/10.1007/BF00548815
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DOI: https://doi.org/10.1007/BF00548815