抄録
Immersion tests of unsaturated polyester resin and FRP were conducted in various alcohols. The corrosion of the resin belonged to the “penetration type, ” in which the resin corrosion was initiated after the penetration of alcohol through into resin was finished. Initial degrada-tion of the resin was controlled by a physical action, followed by a slow chemical degradation, i.e. corrosion. Higher temperature and higher concentration of the solutions promoted the degradation. Lower molecular alcohols produced more severe corrosion by the transesterifica-tion under the neutral condition without a catalyzes of acid or base. Reduction in flexural strength of the resin could be predicted by the volume swollen ratio of the resin. In the case of FRP, the physical degradation was decreased by the filler, and high effectiveness of the FRP for the actual use was shown. However, importance of the effect of corrosion for a long term use was also pointed out.
