Nematic Solutions of Rodlike Polymers Light Scattering from Nematic Solutions with Complex Texture and Phase Separation in Poor Solvents

摘要

Light scattering studies are reported for solutions of the rodlike poly(1,4-phenylene-2,6-benzobisthiazole), PBT, in methane sulfonic acid, MSA. Static and dynamic scattering are reported on a nematic phase with a smooth texture, and the polarized and depolarized static scattering is given during a heating and cooling cycle over the nematic-isotropic-nematic transition. The annealing of a nematic mottled texture formed on cooling the isotropic phase is followed by static scattering. The effect of absorbed water on the nematic phase is reported, including the following features which appear in order of the amount of water absorbed: transformation to a yellow isotropic state with the rodlike chains in an aggregated supramolecular structure: formation of a yellow birefringent state, probably through a spinodal phase separation. Reprints. (jes)