Summary
The viscosity and normal stresses are investigated for a semi-stiff chain polymer, the polyterephthalamide of p-amino-benzhydrazide, as a function of coincentration and shear rate in dilute solution. The results are interpreted in terms of entanglement formation and a shear induced mesophase transition. The ability of this polymer to form ultra-high modulus fibers is thought to be related to such a shear induced mesophase which occurs during the fiber spinning process.
Zusammenfassung
Für ein mäßig steifes Kettenpolymer, das Polyterephthalamid des p-Amino-Benzhydrazids, werden Viskosität und Normalspannungen als Funktion der Konzentration und der Schergeschwindigkeit in verdünnter Lösung untersucht. Die Ergebnisse werden durch die Bildung von Verhängungen und einen scherinduzierten Mesophasen-Übergang gedeutet. Die Fähigkeit des Polymers, Fasern mit extrem hohem Modul zu bilden, wird mit einer derartigen beim Spinnprozeß gebildeten scherinduzierten Mesophase in Zusammenhang gebracht.
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Chapoy, L.L., la Cour, N.F. A rheological investigation of a semi-stiff chain aromatic polyamidehydrazide in dilute solution: Ultra-high modulus fibers and liquid crystalline polymer solutions. Rheol Acta 19, 731–736 (1980). https://doi.org/10.1007/BF01521865
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DOI: https://doi.org/10.1007/BF01521865