A novel liquid monomer (DOPO–VTS) containing 9,10-dihydro-9-oxa-10-phosphaphenanthrene 10-oxide (DOPO) and silicon was synthesized by allowing DOPO to react with vinyltrimethoxysilane (VTS). The DOPO-based organic/inorganic hybrid materials were prepared by the sol–gel and UV-curing methods. The scanning electron microscope results showed that the inorganic substance exhibited good compatibility with the epoxy acrylate (EA) matrix. The high content of organic/inorganic networks contributes an excellent flame retardancy to epoxy acrylate, which can be confirmed by the limiting oxygen index and microscale combustion calorimeter results. The thermogravimetic analysis (TGA) data indicate that the EA/DOPO–VTS hybrid materials possess higher thermal stability than that of pure EA at high temperature. From the direct pyrolysis/mass (DP–MS) analysis, the organic/inorganic networks can play the role of radical trap, which would consume highly reactive hydrogen and hydroxy radicals during combustion. Besides, the dynamic FTIR and DP–MS were used to analyze the thermal degradation mechanism of the organic/inorganic hybrids.

中文翻译：

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溶胶-凝胶法和紫外光固化法制备的新型9,10-二氢-9-氧杂-10-磷苯并菲10-氧化物基有机/无机杂化材料的热学性质

通过使DOPO与乙烯基三甲氧基硅烷（VTS）反应，合成了一种新型液态单体（DOPO-VTS），该单体包含9,10-二氢-9-氧杂-10-磷菲基10氧化物（DOPO）和硅。通过溶胶-凝胶和紫外线固化方法制备了基于DOPO的有机/无机杂化材料。扫描电子显微镜结果表明，无机物与环氧丙烯酸酯（EA）基质具有良好的相容性。高含量的有机/无机网络为环氧丙烯酸酯提供了出色的阻燃性，这可以通过极限氧指数和微型燃烧量热仪的结果得到证实。热重分析（TGA）数据表明，在高温下EA / DOPO-VTS混合材料比纯EA具有更高的热稳定性。通过直接热解/质量（DP-MS）分析，有机/无机网络可以起到自由基捕获的作用，在燃烧过程中会消耗高反应性的氢和羟基自由基。此外，动态FTIR和DP-MS用于分析有机/无机杂化物的热降解机理。