Conclusions
A method of determining the birefringence Δn of fibres having an uncomplicated profile (pentagonal, trilobal, or double rhombus) consists of the following: Over sections of the fibre one determines the ratio of the outer-contour dimensions — the diameterl of the fibre to its thickness d — the path over which the beam acquires the difference in speed γ; the values of γ,l, andl/d are averaged; and the calculation of Δn is carried out from the equation Δn =\((\overline \gamma /\bar l) (\overline {l/d} )\).
This method has been tested on specimens of polyamide fibre prepared under identical melt flow rate conditions.
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Literature cited
E. Kalinovski and G. V. Urbanchik, Man-Made Fibres [in Russian], Legkaya Industriya, Moscow (1966).
S. Ya. Mezhirova, D. V. Fil'bert, et al., in: Synthetic Fibres [in Russian], Khimiya, Moscow (1969).
Additional information
Translated from Khimicheskie Volokna, No. 3, pp. 42–43, May–June, 1983.
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Aver'yanov, A.A., Nekrasov, I.K. & Dubynin, A.A. Birefringence of polyamide fibres of nonround cross-sectional from. Fibre Chem 15, 218–220 (1984). https://doi.org/10.1007/BF00552808
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DOI: https://doi.org/10.1007/BF00552808