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The effect of ceria nanoparticles on improving heat resistant properties of fluorosilicone rubber

机译：二氧化铈纳米颗粒对改善氟硅橡胶耐热性能的影响

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The thermal aging behavior of poly(3,3,3-trifluoropropyl)methylsiloxane was investigated by thermal gravimetric analysis and isothermal aging tests, and the results indicated the degradation mechanism II, oxidation scission of the side groups, played a more important role when the temperature was below 350 degrees C. The addition of ceria had significantly improved the thermal stability of fluorosilicone rubber (FSR) by inhibiting the oxidation scission. Moreover, two types of ceria including laminar-structure ceria (LS-CeO2) and nanoparticle ceria (N-CeO2) were prepared and surface was modified by KH570 and characterized by scanning electron microscopy, transmission electron microscope, and X-ray diffractometer. FSR incorporated with modified LS-CeO2 and N-CeO2 revealed a significant improvement on the heat resistant properties. In particular, after having been thermal oxidative aged for 70 h at 250 degrees C, FSR containing 2 wt % of modified N-CeO2 maintained 72.6% of tensile strength and 63.9% of elongation at break, respectively, while FSR without ceria completely failed. (c) 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 44117.
机译：通过热重分析和等温老化试验研究了聚（3,3,3-三氟丙基）甲基硅氧烷的热老化行为，结果表明，降解机理Ⅱ，侧基的氧化断裂在反应中起着更重要的作用。温度低于350摄氏度。二氧化铈的添加通过抑制氧化分裂，显着提高了氟硅橡胶（FSR）的热稳定性。此外，制备了两种类型的二氧化铈，包括层状二氧化铈（LS-CeO2）和纳米粒子二氧化铈（N-CeO2），并用KH570对其表面进行了改性，并通过扫描电子显微镜，透射电子显微镜和X射线衍射仪对其进行了表征。掺有改性LS-CeO2和N-CeO2的FSR显示出耐热性能的显着改善。尤其是，在250摄氏度下进行热氧化老化70小时后，含有2 wt％改性N-CeO2的FSR分别保持72.6％的拉伸强度和63.9％的断裂伸长率，而不含二氧化铈的FSR则完全失效。 （c）2016 Wiley Periodicals，Inc. J. Appl。 Polym。科学2016，133，44117。

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