Abstract
Abstract : Morphological techniques in conjunction with mechanical testing have been used to elucidate the relationships between mechanical properties and sample microstructures and to use this knowledge to obtain the maximum in strength and modulus for rigid rod polymer fiber and film. The fibers and films of poly (p-phenylene benzobisthiazole) (PBT) which have been investigated were produced at Celanese Research Corporation from liquid crystalline solutions using a dry-jet wet spin process for fibers and either shear or extrusion for films. Microstructural studies involve predominantly scanning and transmission electron microscopy, small and wide x-ray scattering and electron diffraction. Mechanical behavior has been assessed in tensile, fatigue, bending and torsion tests. Tensile properties have been measured over the range-100 C to +200 C. Studies of low molecular weight model compounds and poly-p-phenylene benzo- bisoxazole (PBO) and PBT polymers in solution and solid states have also done by laser Raman and fourier transform infrared spectroscopy.
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