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Boron particles acting as antioxidants for fluorosilicone rubber due to their radical scavenging activity
Polymer Degradation and Stability ( IF 5.9 ) Pub Date : 2018-09-22 , DOI: 10.1016/j.polymdegradstab.2018.09.017
Anna Zheng , Yongkang Huang , Yang You , Jian Hu , Dafu Wei , Xiang Xu , Yong Guan

The heat resistance enhancement of fluorosilicone rubber (FSR) can make it more suitable for cutting-edge applications and extreme conditions. This paper focused on the antioxidant properties of boron particles for FSR and the corresponding mechanism. The thermal stability of FSR and FSR/boron composites was characterized by thermal gravimetric analysis (TGA), isothermal degradation and thermal-oxidative ageing. The results showed that boron significantly improved the thermal stability of FSR. In particular, the FSR/boron (100/10) composite retained 95% of its weight after isothermal degradation at 350 °C for 12 h, while the FSR lost 55% of its weight within the initial 1 h. The antioxidant mechanism of boron was further investigated by chemiluminescence (CL), electron paramagnetic resonance (EPR) and vulcanization curves. It was shown that boron has powerful radical scavenging activity (RSA) and inhibited the oxidation scission of the side groups. Moreover, boron revealed no RSA towards the tert-butoxy radical, ensuring the good vulcanization of the FSR/boron composites.



中文翻译:

硼颗粒具有自由基清除作用,可作为氟硅橡胶的抗氧化剂

氟硅橡胶(FSR)的耐热性增强使其更适合于尖端应用和极端条件。本文重点研究了硼颗粒对FSR的抗氧化性能及相应的机理。FSR和FSR /硼复合材料的热稳定性通过热重分析(TGA),等温降解和热氧化老化来表征。结果表明,硼显着提高了FSR的热稳定性。特别是,FSR /硼(100/10)复合材料在350°C下等温降解12小时后仍保持其重量的95%,而FSR在最初的1小时内损失了其重量的55%。通过化学发光(CL),电子顺磁共振(EPR)和硫化曲线进一步研究了硼的抗氧化机理。结果表明,硼具有强大的自由基清除活性(RSA),并能抑制侧基的氧化断裂。此外,硼没有显示出对叔丁氧基的RSA,从而确保了FSR /硼复合材料的良好硫化。

更新日期:2018-09-22
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