Curing reaction of unsaturated polyester resin modified by dicyclopentadiene

The objective of this research is to prepare modified unsaturated polyester resin(UPR) with good processibility, dimension stability and mechanical pr operties. In this study, dicyclopentadiene (DCPD) is selected as a modifier and the effect of DCPD content on the curing, behavior of the modified UPR is examined via Differential Scanning Calorimetry (DSC) and Rheometrics Dy namic Analysis (RDA) experiments. The results of H-1 NMR identification for the chemical structure of modified UPR show that the trans-structure of UP R decreases as the DCPD content increases. The curing time necessary to rea ch peak maximum in DSC during the curing reaction lengthens as the stereo o bstacles formed by the binary rings increase.