Reliability and durability are strict requirements for silicone elastomers employed in high-temperature applications, if long-time device performance is desired. Improving the thermal stability of silicone elastomers is a major challenge, addressed by both the scientific and the industrial community. Nevertheless, traditional methods such as adding heat-resistant fillers or chemical modifications still suffer from considerable shortcomings. Here, it is demonstrated that the thermal degradation behavior of silicone elastomers is affected strongly by network reactant stoichiometry. Comparative thermal degradation studies were performed on silicone elastomers synthesized with different stoichiometric ratios—and thereby different fractions of elastic, dangling, and sol structures. With the reported findings, we demonstrate how to optimize the stoichiometric ratio used to prepare silicone elastomers, in order to enhance their thermal stability by simple means in high-temperature applications.

如果需要长时间的设备性能，可靠性和耐久性是高温应用中使用的有机硅弹性体的严格要求。改善有机硅弹性体的热稳定性是一项重大挑战，科学界和工业界都对此予以解决。然而，传统方法，例如添加耐热填料或化学改性，仍然存在相当大的缺点。在此证明，有机硅弹性体的热降解行为受到网络反应物化学计量的强烈影响。对以不同化学计量比合成的有机硅弹性体进行了比较热降解研究，从而得出了不同比例的弹性，悬空和溶胶结构。根据报告的发现，