Non-isothermal cure kinetics of V-POSS/UPRand physical properties

In order to improve the performance of unsaturated polyester resin (UPR)，the polyhedral oligomeric silsesquioxane containing vinyl group (V-POSS) was used to modify the unsaturated polyester resins. The curing kinetics and the relationship of apparent activation energy (E_a) with conversionαwere studied by non-isothermal DSC. The properties of mechanics and electricity for the fiberglass-reinforced laminate were determined. The results show that the E_a decreases with increase of conversion α. The curing reaction could be described by autocatalyticŠesták-Berggren (S-B) model and kinetic equations of curing reaction were obtained. The tensile strength of the fiberglass-reinforced laminate increases 17.6 MPa when the mass fraction of V-POSS is up to 5%. The impact strength is lower with V-POSS increase. The electric properties increase with increasing the content of V-POSS，while volume resistivity and surface resistivity rise by 1～2 orders of magnitude.