The non-isothermal curing kinetics of polyurethaneunder CO2 and N2 atmosphere in the pressure range of 0.1-6 MPa were studied using a high-pressure DSC. The Kissinger method and isoconversional method with two different integral equations were adopted to calculate the activation energy. Based on the non-isothermal measurements

the curing mechanism functions f(α) and kinetic parameters could be obtained by the Málek mehod. Then the curing kinetic equations of PU at different pressures of CO2and N2 were determined

and the effects of high pressure CO2 and N2 on the curing process could also be investigated. The results indicated that the activation energy decreased with the increasing of gas pressures which could be explained by the solvent effect and static pressure effect

and high pressure CO2is more beneficial to promote curing reaction than N2. Using the Sestak-Berggren model

it is found that the model is consistent with the DSC curve obtained by non-isothermal test in different pressure gas atmospheres

indicating the system conforms to the autocatalytic model in the presence of atmospheric pressure and high pressure gas.