Polysilazane and platinum were adopted to enhance the thermal stability of silicone rubber. The effect and mechanism of polysilazane and platinum on enhancing thermal stability were investigated via thermogravimetry, scanning electron microscopy-energy dispersive X-ray spectrometry, thermogravimetry-Fourier transform infrared spectrometry, and Fourier transform infrared spectrometry. Remarkable synergism between polysilazane and platinum was found in enhancing thermal stability of silicone rubber. When 1.34 wt% polysilazane and 8 ppm platinum were added, the degradation temperatures were elevated. Furthermore, the thermal residues of silicone rubbers were increased from 30–45 to 66–76 wt%, and maximum degradation rates were reduced from 8.81–15.8 to 4.55–5.02 wt%/min. Besides, silicone rubber demonstrated excellent shape retention at high temperature in the presence of polysilazane and platinum. The mechanism may be that platinum cooperated with polysilazane and efficiently catalyzed radical crosslinking between polysilazane and silicone chains. As a result, a tightly crosslinked network was developed, and degradation of silicone rubber was suppressed.

采用聚硅氮烷和铂来提高硅橡胶的热稳定性。通过热重法、扫描电子显微镜-能量色散X射线光谱法、热重法-傅里叶变换红外光谱法和傅里叶变换红外光谱法研究了聚硅氮烷和铂对提高热稳定性的作用和机制。发现聚硅氮烷和铂之间在提高硅橡胶的热稳定性方面具有显着的协同作用。当添加 1.34 wt% 聚硅氮烷和 8 ppm 铂时，降解温度升高。此外，硅橡胶的热残留量从 30-45 重量％增加到 66-76 重量％，最大降解率从 8.81-15.8 降低到 4.55-5.02 重量％/分钟。除了，在聚硅氮烷和铂的存在下，硅橡胶在高温下表现出优异的形状保持性。其机制可能是铂与聚硅氮烷协同作用，有效催化了聚硅氮烷与硅链之间的自由基交联。结果，形成了紧密交联的网络，并抑制了硅橡胶的降解。