A Rheological Investigation of a Semi-Stiff Chain Aromatic Polyamidehydrazide in Dilute Solution: Ultra-High Modulus Fibers and Liquid Crystalline Polymer Solutions
The production of ultra-high modulus polymeric fibers (1), having a tensile strength comparable to that of steel wire, is based on the ability to achieve a very high degree of long range molecular order (2) during the spinning process. The realization of such high degrees of orientation can be facilitated by solution spinning polymers which are capable of forming a lyotropic, nematic mesophase, i.e. a liquid crystalline solution. The spinning and stretching processes orient the liquid crystal such that the chains are uniaxially oriented with respect to the fiber axis. The solvent is then rapidly removed so as to freeze in the high degree of orientation.
KeywordsShear Rate Double Logarithmic Plot Flexible Chain Polymer Rheological Investigation Nematic Mesophase
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- (11).P.G. de Gennes, The Physics of Liquid Crystals, Oxford University Press, London, 1974.Google Scholar
- (12).E.B. Priestly, P.J. Wojtowicz and P. Sheng, Introduction to Liquid Crystals, Plenum Press, New York, 1974.Google Scholar
- (13).V.N. Tsvetkov, Chapter XIV in Polymer Reviews, Volume 6: Newer Methods of Polymer Characterization, Interscience Publishers, New York, 1964.Google Scholar
- (15).D.G. Baird, Chapter 7 in Liquid Crystalline Order in Polymers, A. Blumstein, Ed., Academic Press 1978.Google Scholar
- (16).E.W. Fischer, G.R. Strobl, M. Dettenmaier, M. Stamm, and N. Steidl, Discussions of the Faraday Society, NO. 68, 1979, Contribution 68/1.Google Scholar