Abstract
For carbon fiber reinforced plastics (CFRP) using 6 kinds of carbon fibers with different surface conditions, ILSS was measured from 25°C to 200°C at various cross head speeds (CHS), and the influence of surface structure of carbon fiber on the high temperature ILSS of CFRP was investigated. The following results were obtained.(1) ILSS measured at high temperatures was higher for CFRP with surface treated fibers.(2) The logarithmic values of shift factor aT by adopting time-temperature superposition principle were plotted against 1/T. These Arrhenius' plots showed differences among kinds of fibers and those with or without surface treatment. In every case, plots are aligned on a line that bends at a point.(3) In the lower temperature range than the bending point on Arrhenius' plot, the activation energy were from 140 to 230kJ/mol and it increased with the increment of the amount of COOH group obtained from C1s peak of X-ray photoelectron spectroscopy.
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