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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >Influence of the polymer architecture on the high temperature behavior of SiCO glasses: A comparison between linear- and cyclic-derived precursors
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Influence of the polymer architecture on the high temperature behavior of SiCO glasses: A comparison between linear- and cyclic-derived precursors

机译：聚合物结构对SiCO玻璃高温行为的影响：线性和环状衍生前体之间的比较

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摘要

Two series of cross-linked polysiloxanes, precursors for silicon oxycarbide glasses, have been synthesized from a linear and a cyclic Si-H-containing siloxane having the same chemical formula (SiCOH4). The crosslinking has been achieved by hydrosilylation reaction with various amounts of divinylbenzene (DVB). A detailed structural characterization has been performed by Si-29 and C-13 MAS NMR, FT-IR and chemical analysis. As a result, two different structural models have been proposed for the two series of resins. The two resins have been pyrolyzed at 1400 degrees C and the resulting SiCO ceramics characterized by X-ray diffraction. It has been shown that the stability of the amorphous silica phase present in the SiCO ceramics is strongly influenced by the molecular organization of the starting precursors. The presence of siloxane rings in the cyclic-derived polysiloxane decreases the stability of the amorphous SiO2 and promotes the crystallization of cristobalite.
机译：由具有相同化学式（SiCOH4）的线性和环状含Si-H的硅氧烷合成了两系列交联的聚硅氧烷，它们是碳氧化硅玻璃的前体。交联已通过与各种量的二乙烯基苯（DVB）进行氢化硅烷化反应实现。通过Si-29和C-13 MAS NMR，FT-IR和化学分析进行了详细的结构表征。结果，针对这两种树脂提出了两种不同的结构模型。两种树脂已在1400摄氏度下热解，所得SiCO陶瓷的特征在于X射线衍射。已经表明存在于SiCO陶瓷中的无定形二氧化硅相的稳定性受起始前体的分子组织的强烈影响。环状衍生的聚硅氧烷中硅氧烷环的存在降低了无定形SiO 2的稳定性并促进了方石英的结晶。

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