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首页> 外文会议>European weathering symposium >THERMAL STABILITY OF CARBONYL IRON FILLED ELASTOMERS
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THERMAL STABILITY OF CARBONYL IRON FILLED ELASTOMERS

机译：羰基填充弹性体的热稳定性

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Thermal decomposition of carbonyl iron filled composites was studied in order to investigate the influence of functional filler on the heat resistance of polymer matrixes. Polyorganosiloxane composites containing 10 and 50 vol.%of carbonyl iron powders differ in elemental composition,morphology,microstructure,and surface modification were prepared.Thermal stability of composites and pure matrix was analysed under inert atmosphere up to 1200 °C. Polyorganosiloxane matrix degrades in two steps,where the first step degradation mechanism is cyclooligomerization,and the second step is connected with two competing processes of cyclooligomerization and crosslinking degradation.Similar shape of curves can be observed for all 10 vol.%composites,while for 50 vol.% composites a dramatic enhancement of the stabilizing effect is observed,except for composites filled with particles coated by SiO2.Composites containing carbonyl iron coated by SiO2 exhibit accelerated first step of depolymerization most likely due to water and hydroxyl groups absorbed on SiO2.Nevertheless,the disappearance of the second stage of degradation testifies for hindrance of unzipping reaction with most likely forced crosslinking reactions between polysiloxane chains and SiO2 coating on the filler surface.
机译：研究了羰基填充复合材料的热分解，以研究功能填料对聚合物基质耐热性的影响。含有10和50体积的聚有机硅氧烷复合材料。制备元素组成，形态，微观结构和表面改性的羰基粉末的百分比不同。在惰性气氛下分析复合材料的热稳定性，高达1200℃。聚有机硅氧烷基质分为两个步骤，其中第一步降解机制是环珠酮化，第二步与两个竞争过程的环珠酮化和交联降解的过程连接。可以观察到所有10 Vol。％复合材料的曲线形状，而50 Vol。％复合材料观察到稳定效果的显着增强，除了填充有SiO2的颗粒的复合材料，含有SiO2涂覆的羰基铁的材料表现出促进的第一步骤的解聚步骤最有可能由于SiO 2上吸收的水和羟基。无论如何，第二阶段的降解阶段的消失证明了在填充表面上的聚硅氧烷链和SiO 2涂层之间的最有可能的强迫交联反应的解体反应的阻碍。

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