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首页> 外文期刊>Journal of Applied Polymer Science >Thermooxidative degradation behavior of poly(silphenylene-siloxane)s
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Thermooxidative degradation behavior of poly(silphenylene-siloxane)s

机译：聚硅亚苯基硅氧烷的热氧化降解行为

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摘要

Copolymers of poly(silphenylene-siloxane) with dimethylsiloxane and diphenylsiloxane with various end groups were synthesized through an SiAH/SiAOR polycondensation process. The thermooxidative degradation behaviors of the copolymers were investigated by thermogravimetric analysis and IR spectrometry techniques. All of the polymers were characterized by a two-step mass loss. The first one, which peaked at 510-545°C in differential thermogravimetric curves, was mostly caused by the main-chain depolymerization, whereas the second one, which reached its maximum around 650° C, was caused by side-group oxidation and SiAC bond scission. The main-chain depolymerization occurred over a temperature range of some 470-580°C, whereas SiAC bond scission and side-group oxidation occurred over a temperature range of about 585° C to above 720°C. The incorporation of phenyl groups in the end groups greatly retarded the temperature for the degradation onset of the main chain to 120°C higher.
机译：通过SiAH / SiAOR缩聚反应合成了具有不同端基的聚硅亚苯基硅氧烷与二甲基硅氧烷和二苯基硅氧烷的共聚物。通过热重分析和红外光谱技术研究了共聚物的热氧化降解行为。所有聚合物均具有两步质量损失的特征。第一个在主重链解聚反应中在差示热重曲线中达到峰值510-545°C，而第二个在650°C附近达到最大值是由于侧基氧化和SiAC引起的。断链。主链解聚发生在大约470-580°C的温度范围内，而SiAC键断裂和侧基氧化发生在大约585°C到720°C以上的温度范围内。端基中苯基的掺入大大降低了主链降解起始温度至120℃。

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