A new phosphorous/silicon/aluminum hybrid flame retardant (SAlu) was prepared by a surface grafting modification of alumina with a polymer (SDPS). The polymer was prepared by a condensation reaction between 3,9‐dichloro‐2,4,8,10‐tetrahydroxy‐3,9‐diphosphate heterocyclic‐3,9‐dioxide [5.5] undecane (SPDPC) and diphenyldisiloxol. The structure of the SAlu was further characterized by Fourier transform infrared spectroscopy, X‐ray diffraction, UV–Vis absorption, and particle size analysis. Thermogravimetric analysis showed that SPDS was grafted over 40% of the alumina surface. When introduced into epoxy resin, SAlu effectively improved the thermal stability and carbonization rate of the epoxy composites at high temperature. Carbonization studies showed that SAlu promoted formation of a ceramic‐carbon coking structure with a porous morphology of aggregates, which isolate combustible materials, heat, and oxygen. These features improved the flame retardant performance of the composite. The solidified materials were evenly dispersed in the network structure to improve the elastic deformation ability and glass transition temperature of the solidified resin.

中文翻译：

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双环硅/磷接枝氧化铝的合成，表征及其在提高环氧树脂阻燃性中的应用

通过用聚合物（SDPS）对氧化铝进行表面接枝改性，制备了一种新型的磷/硅/铝混合阻燃剂（SAlu）。该聚合物是通过3,9-二氯-2,4,8,10-四羟基-3,9-二磷酸杂环-3,9-二氧化物[5.5]十一烷（SPDPC）与二苯基二硅氧烷之间的缩合反应制得的。SAlu的结构通过傅立叶变换红外光谱，X射线衍射，UV-Vis吸收和粒度分析得到进一步表征。热重分析表明，SPDS接枝了40％的氧化铝表面。将SAlu引入环氧树脂中后，可有效提高环氧复合材料在高温下的热稳定性和碳化速率。碳化研究表明，SAlu促进了具有聚集体多孔形态的陶瓷-碳焦化结构的形成，该聚集体将可燃材料，热量和氧气隔离。这些特征改善了复合材料的阻燃性能。固化的材料均匀地分散在网络结构中，以提高固化树脂的弹性变形能力和玻璃化转变温度。