Abstract
The mechanical indexes of fibres based on two types of poly-para-aramids were investigated as a function of their logarithmic viscosity characterizing the molecular weight. Fibres fabricated from the polymers of highest molecular weight with partial hydrolytic degradation in a medium of liquid-crystalline sulfuric acid solutions had the best breaking strength indexes. This could be due to a change in the polydispersity with respect to the molecular weight of the polymers. The increase in the rigidity of the fibres in thermal drawing caused by slight melting of the fibres at sites of contact with each other indirectly indicates the capacity for structural alterations, manifested by transient softening and sintering of elements of the supermolecular structure with elimination of microcracks, which preserves or even increases the breaking strength of the high-strength fibres.
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References
J. R. Shaefgen, V. S. Foldi, et al.,Am. Chem. Soc. Polym. Prepr.,17, No. 1, 69–74 (1976).
M. Arpin and C. Strazielle,Polymer,18, No. 6, 591 (1977).
A. I. Koretskaya, M. P. Babushkina, G. I. Kudryavtsev, and L. V. Mileshkina,Khim. Volokna, No. 1, 16–17 (1982).
H. Blades, US Patent No. 3767756 (1973).
T. Kaneda, S. Ishikawa, et al., US Patent No. 4178431 (1979).
T. Kaneda, S. Ishikawa, et al.,Makromol. Chem.,183, 433–457 (1981).
K. Tashiro, M. Kobayashi, and H. Tadokoro,Macromolecules,10, No. 2, 413–420 (1977).
J. P. Hummel and P. J. Flory,Macromolecules,13, No. 3, 479–484 (1980).
V. N. Smirnova and M. M. Iovleva,Khim. Volokna, No. 6, 14–15 (1997).
I. N. Shtennikova, T. V. Filippova, and P. N. Lavrenko,Vysokomolek. Soedin.,A38, No. 8, 1320–1327 (1996).
Y. Termonia and P. Smith,Polymer,27, No. 12, 1845–1849 (1986).
J. R. Schaefgen,Aramid Fibres: Structure, Properties and Applications, Strength and Stiffness of Polymers. New York, Basel (1983), pp. 327–355.
N. M. Emanuel' and D. G. Knorre,Course in Chemical Kinetics [in Russian], Vyssh. Shk., Moscow (1984).
H. Blades, US Patent No. 3869430 (1975).
N. P. Osipov, Candidate Dissertation, All-Union Scientific-Research Institute of Fibre Planning, Mytishchi (1987).
T. Kunugi, H. Watanabe, and M. Hashimoto,J. Appl. Polym. Sci.,24, No. 4, 1039–1051 (1979).
V. G. Brusentsova, L. K. Kuznetsova, et al.,Khim. Volokna, No. 3, 38–39 (1982).
T. S. Sokolova, A. V. Volokhina, et al.,Khim. Volokna, No. 3, 25–28 (1974).
K. haraguchi, T. Kajiyama, and M. Takayanagi,J. Appl. Polym. Sci.,23, No. 3, 903–926 (1979).
L. P. Mil'kova, N. S. Pozhalkin, et al., in:Preprints of the II International Symposium on Chemical Fibres [in Russian], Vol. 1, Kalinin (1977), pp. 138–145.
J. P. Meraldi and J. Ribiere, US Patient No. 5 246 776 (1993).
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Terlon Limited Partnership; All-Russian Scientific-Research Institute of Polymer Fibres, Mytishchi, Translated fromKhimicheski evolokna, No.3, pp. 31–35, May–June, 1999.
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Kiya-Oglu, V.N., Volokhina, A.V. & Banduryan, S.I. Effect of the molecular weight of poly-para-aramids and structural changes in heat treatment on the mechanical indexes of the fibres. Fibre Chem 31, 208–214 (1999). https://doi.org/10.1007/BF02361007
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DOI: https://doi.org/10.1007/BF02361007