In this work, aluminum oxide (Al₂O₃) was added to hyperbranched flame retardant (PTDOB) modified epoxy resin (EP) system to develop a novel EP thermoset (Al₂O₃-PTDOB/EP) with superior comprehensive performance. Al₂O₃-PTDOB/EP exhibited excellent flame retardancy, smoke-suppressing effects, and enhanced mechanical properties due to the crack pinning effects caused by the introduction of Al₂O₃. In detail, the limiting oxygen index (LOI) and UL-94 rating of Al₂O₃-PTDOB/EP-3 reached 34.6% and V-0 rating, respectively. Cone calorimeter test showed that the total heat release, total smoke production (TSP) and average effective heat of combustion of Al₂O₃-PTDOB/EP-3 were reduced by 14.5, 27.3 and 19.2% in comparison to PTDOB/EP, respectively. Furthermore, the impact, tensile and flexural strengths of Al₂O₃-PTDOB/EP-3 were significantly improved by 16.7 28.4 and 10.7%, respectively, because the addition of Al₂O₃ provided the carbon layer barrier and crack pinning effect for the EP matrix. Moreover, thermal conductivity of Al₂O₃-PTDOB/EP was also improved due to the excellent thermal conductivity of Al₂O₃, which had broadened its application in the field of electronic packaging.

中文翻译：

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Al2O3和超支化阻燃剂改性环氧树脂的抑烟和导热性能

在这项工作中，将氧化铝（Al ₂ O ₃）添加到超支化阻燃剂（PTDOB）改性环氧树脂（EP）体系中，开发了一种具有优异综合性能的新型EP热固性材料（Al ₂ O ₃ -PTDOB/EP）。由于引入Al ₂ O ₃引起的裂纹钉扎效应，Al ₂ O ₃ -PTDOB/EP表现出优异的阻燃性、抑烟效果和增强的机械性能。详细说明Al ₂ O ₃的极限氧指数（LOI）和UL-94等级-PTDOB/EP-3 分别达到 34.6% 和 V-0 评级。锥形量热仪测试表明，与PTDOB/EP相比，Al ₂ O ₃ -PTDOB/EP-3的总放热量、总发烟量（TSP）和平均有效燃烧热分别降低了14.5%、27.3%和19.2% . 此外，Al ₂ O ₃ -PTDOB/EP-3的冲击强度、拉伸强度和弯曲强度分别显着提高了 16.7、28.4 和 10.7%，这是因为 Al ₂ O _{3 的添加}提供了碳层阻挡和裂纹钉扎作用。 EP 矩阵。此外，Al ₂ O _{3 的}热导率由于Al ₂ O ₃优异的导热性，-PTDOB/EP也得到了改进，拓宽了其在电子封装领域的应用。