To overcome high water absorption of inorganic metal salts and their poor compatibility with resin, acetylacetone metal salts (M(acac) n ) were selected as the catalysts of benzoxazine resin. Their effects on the catalytic activity, structure, and thermal stability of polybenzoxazine had been estimated by dynamic differential scanning calorimetry, in situ Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, and thermal gravimetric analyzer. The results revealed that M(acac) n of iron (Fe3+), cobalt (Co3+ and Co2+), and copper (Cu2+) exhibited high catalytic activity and reduced evidently activation energy, especially acetylacetone iron salt. The addition of M(acac) n was beneficial to the formation of Ph–N–Ph structure, which was easy to form a denser carbon layer during thermal degradation, prevented heat transfer and further decomposition of the resin, and finally led to the increase of carbon residue at high temperature.

中文翻译：

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乙酰丙酮金属盐对聚苯并恶嗪固化机理及热稳定性的影响

为克服无机金属盐吸水率高、与树脂相容性差的问题，选择乙酰丙酮金属盐(M(acac) n )作为苯并恶嗪树脂的催化剂。通过动态差示扫描量热法、原位傅里叶变换红外光谱、X 射线光电子能谱和热重分析仪评估了它们对聚苯并恶嗪的催化活性、结构和热稳定性的影响。结果表明，铁(Fe3+)、钴(Co3+和Co2+)和铜(Cu2+)的M(acac)n表现出较高的催化活性，活化能明显降低，尤其是乙酰丙酮铁盐。M(acac)n的加入有利于Ph-N-Ph结构的形成，在热降解过程中容易形成更致密的碳层，