Isoconversional kinetic analysis for determining the rate of cross-linking for Pt and peroxide cure silicone rubbers

• DOI: 10.1016/j.tca.2021.178982
• Publication Date: 2021-06-30T05:47:30Z
• Authors: Tero Jalkanen
• Keywords: Rheometry; Silicone rubber; Organic peroxide; Peroxide

Abstract The cross-linking of silicone rubber can be accomplished through reactions such as cross-linking with radicals and cross-linking by addition. Here we examine the kinetics of these reactions by differential scanning calorimetry and moving die rheometry. Differential scanning calorimetry results show the importance of conducting measurements for platinum catalyzed addition cure silicone rubber as soon as possible after mixing the materials. Isoconversional kinetic analysis with the Vyazovkin method is shown to produce predictions for rate of cross-linking, which are comparable to results measured with conventionally used moving die rheometry (MDR). Moreover, the Vyazovkin method, along with MDR data, can be used for estimating the experimental lag present in MDR experiments.