Abstract: In this paper, author study the curing reaction of UP in Supercritical Carbon Dioxide. The results show that supercritical carbon dioxide to make the time of exothermic peak of unsaturated polyester resin system has Significant shortening, to achieve the original solid 53.8 percent of the time. With the addition of supercritical carbon dioxide, double bond reactions rate become significantly lower, however, double bond reactions rate did not as high pressure continues to decrease.

Key words: Supercritical Carbon Dioxide, Unsaturated Polyester Resin, Curing Reaction