Polymer Bulletin, Vol.37, No.2, 245-251, 1996
Band-Texture Decorated Spatial-Distribution of Molecular-Orientation Around Air Bubbles in Hydroxypropyl Cellulose Aqueous-Solution
The air bubbles in the concentrated hydroxypropyl cellulose (HPC) aqueous solution have been employed to monitor the spatial distribution of molecular orientation around spherical or ellipsoidal particles within the liquid crystalline matrix. The deformation of the air bubbles under shear flow was observed in a polarizing microscope. The stream lines are curved near air bubbles. Corresponding spatial distribution of the molecular orientation was revealed by the technique of band-texture decoration. Associated pleated morphology was also observed in a scanning electron microscope.
Keywords:LIQUID-CRYSTALLINE POLYMERS;ORIENTED THERMOTROPIC POLYMERS;SHEAR-INDUCED TEXTURES;ELECTRON-MICROSCOPY;OPTICAL MICROSCOPY;AROMATIC POLYESTER;FILMS;MORPHOLOGY;POLY(1;4-PHENYLENETEREPHTHALAMIDE);DISCLINATIONS