Effect of the molecular weight of poly-para-aramids and structural changes in heat treatment on the mechanical indexes of the fibres

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-cryst...

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Bibliographic Details
Published in:Fibre chemistry 1999-05, Vol.31 (3), p.208-214
Main Authors: Kiya-Oglu, V. N., Volokhina, A. V., Banduryan, S. I.
Format: Article
Language:English
Subjects:
Breaking
Fibers
Fibres
Molecular weight
Polymers
Preserves
Softening
Strength
Studies
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Summary: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.[PUBLICATION ABSTRACT]
ISSN:0015-0541
1573-8493
DOI:10.1007/BF02361007