Orientation distribution and layerlike morphology in extrusion‐molded sheets of a liquid crystalline copolyester amide

摘要

AbstractFracture surface morphology and orientation distribution in the extrusion‐molded sheets of a thermotropic liquid crystalline copolyester amide were investigated by scanning electron microscopy (SEM), wide‐angle X‐ray diffraction (WAXD), and polarized Fourier transform infrared (FTIR) microspectroscopy. The layerlike morphology consisting of two outer layers and a central layer between them was observed on the fracture surface. The microscopic orientation functions in the extrusion‐molded sheets were evaluated from the polarized FTIR microspectra that were measured in the microscopic domain 40 μm wide using a redundantly apertured infrared microscope. The microscopic orientation function in the outer layer was shown to be higher than that in the central layer. The effects of the draw‐down ratio and extrusion temperature on the orientation distribution and the layerlike morphology are discussed. © 1993 John Wile