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Thermal-Oxidative Stability of Polydimethylsiloxane

机译:聚二甲基硅氧烷的热氧化稳定性

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摘要

Poly(ferrocenyldimethylsilane) (PFMS) and poly(ferrocenyldiphenylsilane) (PFPS) are employed as additives to enhance the thermal-oxidative stability of PDMS. The thennal-oxidative stability of PDMS, PDMS/PFMS and PDMS/PFPS compounds are characterized as chemical structure (structure of the substituent and the main chain), molecular size (molecular weight and its distribution) and material properties (shear viscosity, gel time and weight loss). The thermal-oxidative stabilities of PDMS/PFMS and PDMS/PFPS compounds at 300 °C in air are obviously enhanced because PFMS and PFPS restrain the thermal-oxidative degradation of the methyl group and reduce the depolymerization of the main chain. The reduction of the depolymerization of the main chain is a result of the decrease in hydroxyl group formed by oxidation of methyl group. PFPS shows better antioxidation to PDMS than PFMS.
机译:聚(二茂铁基二甲基硅烷)(PFMS)和聚(二茂铁基二苯基硅烷)(PFPS)被用作添加剂,以增强PDMS的热氧化稳定性。 PDMS,PDMS / PFMS和PDMS / PFPS化合物的最终氧化稳定性表征为化学结构(取代基和主链的结构),分子大小(分子量及其分布)和材料特性(剪切粘度,胶凝时间)和减肥)。 PDMS / PFMS和PDMS / PFPS化合物在300°C的空气中的热氧化稳定性得到了明显增强,因为PFMS和PFPS抑制了甲基的热氧化降解并减少了主链的解聚。主链解聚的减少是由甲基氧化形成的羟基减少的结果。 PFPS对PDMS的抗氧化性比PFMS好。

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