ポリスチレンの疲労による劣化

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Degradation of polystyrene caused by dynamic fatigue combined with irradiation of ultraviolet rays is here under reported. The fatigue behavior during the fatigue test, i. e. the dynamic deflection and temperature rises the specimens, were also observed with the method as was reported in the previous paper. ^3) The degradation was determined by infrared and ultraviolet spectroscopy, X-ray diffraction. differential thermal analysis, thermogravimetric analysis and solution viscosity. The fatigue sting machine used here was the modified one of ASTM D-671-63 T method B. The specimens were made of G. P. grade polystyrene by injection for the ASTM type. The condition of the sample prepapation are as follows : original. irradiation only of ultraviolet rays (48, 167 hrs) , fatigue only (48, 167 hrs) , irradiation (48, 167 hrs) followed by fatigue (48, 167 hrs) and irradiating fatigue (48, 167 hrs) , their alternating loads being 2. 5 kg for 48 hrs and 1. 6 kg for 167 hrs. The results of the experiment show that for G. P. polystyrene. the degradation caused by the dynamic fatigue and the irradiation of ultraviolet rays are not remarkable, though phot-oxidation observed in the case of polystyrene film, and so the photo-degradation may be limited to the specimen surface. As to the fatigue behavior of polystyrene, the dynamic deflection change was small and this phenomenon agrees with the small degradation observed in the present experiment.
社団法人日本材料学会の論文
1969-11-15

ポリスチレンの疲労による劣化

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