A series of aromatic polyesters based on either poly(chloro-p-phenylene terephthalate) or poly(methyl-p-phenylene terephthalate) modified by incorporation of various amounts of bisphenols of different structures were prepared and their thermotropic liquid crystal properties were studied by several methods including: (1) visual observation of stir-opalescence of the polymer melts, (2) examination of melt birefringence on a polarizing microscope, (3) studies of small angle light scattering characteristics, and (4) characterization by wide angle x-ray diffraction. It was found that the steric effects on non-linear bisphenol modifiers were the most important factors in controlling the liquid crystallinity of the resulting copolyesters. (Author)
No takes yet. Share an insight, caveat, or question.
Lenz et al. (1981) studied this question.