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首页> 外文会议>3rd European weathering symposium : Natural and artificial ageing of polymers >THERMAL STABILITY OF CARBONYL IRON FILLEDELASTOMERS
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THERMAL STABILITY OF CARBONYL IRON FILLEDELASTOMERS

机译：羰基铁填充弹性体的热稳定性

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摘要

Thermal decomposition of carbonyl iron filled composites was studied in order torninvestigate the influence of functional filler on the heat resistance of polymer matrixes.rnPolyorganosiloxane composites containing 10 and 50 vol.%of carbonyl iron powdersrndiffer in elemental composition,morphology,microstructure,and surface modificationrnwere prepared.Thermal stability of composites and pure matrix was analysed underrninert atmosphere up to 1200 °C.rnPolyorganosiloxane matrix degrades in two steps,where the first step degradationrnmechanism is cyclooligomerization,and the second step is connected with tworncompeting processes of cyclooligomerization and crosslinking degradation.Similarrnshape of curves can be observed for all 10 vol.%composites,while for 50 vol.%rncomposites a dramatic enhancement of the stabilizing effect is observed,except forrncomposites filled with particles coated by SiO2.Composites containing carbonyl ironrncoated by SiO2 exhibit accelerated first step of depolymerization most likely due tornwater and hydroxyl groups absorbed on SiO2.Nevertheless,the disappearance of thernsecond stage of degradation testifies for hindrance of unzipping reaction with mostrnlikely forced crosslinking reactions between polysiloxane chains and SiO2 coating onrnthe filler surface.
机译：为了研究功能填料对聚合物基体耐热性的影响，对羰基铁填充的复合材料进行了热分解研究。制备了含10％和50％（体积）羰基铁粉的聚有机硅氧烷复合材料，其元素组成，形貌，微观结构和表面改性均不同在高达1200°C的惰性气氛下分析了复合材料和纯基质的热稳定性。rn聚有机硅氧烷基质分两步降解，第一步降解机理为环低聚，第二步与环低聚和交联降解的两个竞争过程相关。可以观察到所有10vol。％的复合物的曲线，而对于50vol。％的复合物，除了用SiO2包覆的颗粒填充的复合物外，还观察到了稳定作用的显着增强。然而，第二阶段降解的消失证明了解链反应的阻碍，即聚硅氧烷链和填料表面的SiO2涂层之间最可能被迫发生交联反应。

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