Morphological studies of poly-p-phenylenebenzobisoxazole (PBO) fibers on the process that determines the direction of the crystal a-axis along the radius direction during the formation of fiber structures
Preferential orientation of the a-axis of the PBO crystal in the fibers was analyzed.
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Molecular orientation of PBO fibers was estimated strictly.
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Fiber modulus should be related to molecular orientation not to preferential orientation.
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