The dry jet wet spinning of various molecular weight aromatic polyhydrazide solutions is used to exemplify tenacity and spinnability reduction due to solution fracture, an elastic flow instability initiating in the capillary entrance region. Signif icantly, fiber spun at shear rates an order of magnitude above that required for fracture initiation evidences no tenacity loss. A flow visualization apparatus, used to photo graph the solution orientation changes resulting from fracture, verified reduced in stability amplitude at high shear rates.
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References
1.
Brenschede, E., and Klein, J., Pressure Drop and Unstable Flow of Elastic Liquids in a High Pressure Capillary Viscometer (in German), Rheol. Acta9, 130-136 (1970).
2.
Dobinson, F. , Pelezo, C.A., Black, W.B., Lea, K.R., and Saunders , J.H., High Strength, HighModulus Fibers from Hydrazide Polymers and Copolymers, J. Appl. Polym. Sci.23, 2189-2195 (1979).
3.
Everage, A.E. , and Ballman, R.L., A Mechanism for Polymer Melt or Solution Fracture, J. Appl. Polym. Sci.18, 933-937 (1974).
4.
Giesekus, H. , Nonlinear Effects in the Flow of Viscoelastic Liquids Through a Jet (in German), Rheol. Acta7, 127-138 (1968).
5.
Giesekus, H. , Various Phenomena in the Flow of Viscoelastic Liquids Through a Jet, Rheol. Acta8, 411-421 (1969).
6.
Graessley, W.W. , and Segal, L., Flow Behavior of Polystyrene Systems in Steady Shearing Flow, Macromol.2, 49-57 ( 1969).
7.
Moncrieff, R.W. , "Man-Made Fibers," John Wiley and Sons, New York, 1975.
8.
Paul, D.R., and Southern, J.H., TheRole of Entanglements in the Elastic Fracture of Polymer Solutions, J. Appl. Polym. Sci.19, 3375-3380 (1975).
9.
Southern, J.H. , and Paul, D.R., ElasticFracture of Polystyrene Solutions, Polym. Eng. Sci.14, 560-566 (1974).
10.
Tomita, Y., and Shimbo, T., Unstable Flow of Viscoelastic Fluids, in "Appl. Polym. Symp. " 20, 1973, pp. 137-153.
11.
Vinogradov, G.V., Malkin, A. Ya., Blinova, N.K., Sergeyenkov, S.I., Zabugina, M.P., Titkova, L.V., Yanovsky, Y.G., and Shaiganova , V.G.Peculiarities of Flow and Viscoelastic Properties of Solutions of Polymers with a Narrow Molecular-Weight Distribution. Eur. Polym. J.9, 1231-1249 (1973).
12.
Vinogradov, G.V., and Manin, V.N., An Experimental Study of Elastic Turbulence, Kolloid Z ZPolym. 201, 93-98 (1965).
13.
Wulf, K., and Phillips, B., Rheological Investigations of Spinning Dopes (in German), Rheol. Acta4, 113-119 (1965).
