Abstract
Differential scanning calorimetry was used to study the curing behavior of an additional liquid silicone rubber. Kissinger‒Akahira‒Sunose (KAS), Flynn‒Wall‒Ozawa (FWO), and Friedman (FR) model-free methods were used to calculate the curing activation energy of the additional liquid silicone rubber. The isothermal degree of cure vs. curing time curve was predicted by the Vyazovkin method at a temperature of 110 °C, and the non-isothermal curing degree vs. curing temperature curve was simulated as well. The results showed that the KAS and FWO simulated the isothermal curing behavior better than the FR in that the results calculated by the FR had a great deviation. With a steady increase in the dosage of catalyst, the activation energy was decreased gradually. This indicates that as the catalyst dosage was increased the curing degree was enhanced, which was accompanied by a significant change in the curing mechanism due to a concentration increase of the reacted vinyl groups. This work offers an insight into the hydrosilylation curing kinetics of silicone rubbers and resins.
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