Abstract
The effect of low-intensity UV-ray irradiation on the tensile strength has been investigated for PBO (poly-p-phenylene benzobisoxazole) fibers. The PBO fibers used in this study were supplied by Toyobo Co. Ltd, Japan. The fibers were exposed to UV irradiation with two intensities of 2 and 4W/m^2 and different periods of irradiation time from 1 up to 10^3h. Tensile testing of single-fiber specimens was carried out using a universal testing machine using a 5N load cell. It was found that tensile strength of the PBO fiber satisfied the normal distribution regardless of UV irradiation. The tensile strength of irradiated fiber remained almost constant up to 10^3uJ of radiant dosages, but it decreased slowly in the range of 10^3 to 10^6uJ. The relation between the tensile strength and radiant dosage was independent of the irradiance, therefore the radiant dosage was most suitable parameter to describe the tensile strength at the different irradiances.
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