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Structural Basis for Intumescence ― Study of Model Compounds Containing Spiro Phosphorus Moiety and Polymers Containing Such Units

机译:吹动的结构基础 - 含有螺磷部分的模型化合物及含有这些单位的聚合物的研究

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Spiro phosphorus compounds play a vital role, in recent years, in imparting flame retardancy and intumescence to the polymers. To ascertain the mechanism of the intumescency, model spiro phosphorus compounds, i.e., 3,9-disubstituted-2,4,8, 10-tetraoxa-3,9-diphosphaspiro-[5.5]-undecan- 3,9-dioxide, were chosen (compound Ⅰ : substitution is chloro group and compound Ⅱ : substitution is hydroxo group). The model compounds were investigated using Differential Thermal Analysis (DTA) and Thermal Volatilization Analysis (TVA), Vacuum Pyrolysis-MS and Off-line Pyrolysis followed by degradation product analysis by GC-MS. Dichlorospiro compound (Ⅰ) showed an eruptive release of gases at 320 °C and dihydroxo spiro compound (Ⅱ) at about 350°C. The major components of the gas released were found to be HCl and H_2O in the case of compound Ⅰ and H_2O in the case of compound Ⅱ. The degradation product analysis showed the formation of wide varieties of substituted and condensed aromatic compounds in measurable quantities. From the acquired data, it is confirmed that the intumescence takes place within a narrow range of temperature (10°) and in this temperature limit extensive dehydrohalogenation and dehydration are taking place. Highly thermally reactive unsaturated hydrocarbons are produced which mainly undergo polymerization to aromatic compounds and finally to char.
机译:螺旋磷化合物近年来促使阻燃性和吹动到聚合物的吹动性起着至关重要的作用。为了确定脉搏,螺磷化合物,即3,9-二取代-2,4,8,10-四氧化-3,9-二磷磷磷磷磷磷吡咯-3,9-二氧化碳的机制选择(化合物Ⅰ:取代是氯基,化合物Ⅱ:取代是羟基组)。使用差分热分析(DTA)和热挥发分析(TVA),真空热解 - MS和离线热解,然后通过GC-MS进行降解产物分析来研究模型化合物。二氯磷岛化合物(Ⅰ)在约350℃下显示出320℃和二氢辛柳化合物(Ⅱ)的喷发气体释放。在化合物Ⅱ的情况下,发现在化合物Ⅰ和H_2O的情况下发现释放的气体的主要成分是HCl和H_2O。降解产物分析表明,在可测量的数量中形成宽品种取代和浓缩芳族化合物。从所获得的数据中,确认致力在窄的温度(10°)范围内,并且在该温度下,举行广泛的脱氢脱卤化和脱水。产生高热反应的不饱和烃,其主要经历聚合为芳族化合物,最后将其达到炭。

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