| Abstract: | Band textures are observed in a precipitation film from a presheared poly(1,4-phenylene terephthalamide) solution, a typical lyotropic main-chain polymeric liquid crystal. By polarized optical microscopy (POM) studies and in the same specimen system, both sinusoidal and zigzag supermolecular structures associated with band textures are found, according to the comparison between the experimental micrographs and the theoretical birefringence patterns. As a consequence, the present paper describes how to distinguish these two supermolecular structures merely by POM and demonstrates that both structure models are reasonable. © 1997 John Wiley & Sons, Ltd. |
