席夫碱化合物改性双马来酰亚胺树脂的制备及性能

Preparation and Properties of Bismaleimide Resin Modified by Schiff Base Compound

全球航空航天产业的飞速发展促使以双马来酰亚胺(BMI)树脂为主的复合材料、结构胶黏剂及其相关材料的应用范围扩大及用量增加,但未改性的BMI树脂存在熔融温度与固化温度较高以及脆性大等缺点。本文合成了具有两种不同化学结构的席夫碱化合物,并通过与BMI共混来对BMI树脂进行改性。通过差示扫描量热仪(DSC)和傅里叶变换红外光谱仪(FTIR)表征共混体系的聚合反应行为,通过热重分析(TG)和动态热机械分析(DMA)表征了共混体系的耐热性和热稳定性。结果表明,席夫碱的加入不仅降低了共混体系的熔融温度,同时还可以降低BMI的固化温度,使得固化反应更加容易进行;席夫碱的加入还提高了共混体系的玻璃化转变温度(Tg)并保持较好的热稳定性。此外,席夫碱化合物的化学结构对其与BMI的反应性以及对应聚合物的耐热性和热稳定性均有一定程度的影响。

The rapid development of the global aerospace industry has led to the expansion of the application scope and increase in the amount of composites,structural adhesives and their related materials based on bismaleimide(BMI)resins,but unmodified BMI resins have the disadvantages of high melting and curing temperatures as well as high brittleness.In this paper,Schiff base compounds with different chemical structures were synthesized and BMI resins were modified by blending with Schiff base compounds.The polymerization reaction behaviors of blends were characterized by differential scanning calorimetry(DSC)and Fourier transform infrared spectroscopy(FTIR),and the heat resistance and thermal stability of the blended system were characterized by thermogravimetric analysis(TG)and dynamic thermomechanical analysis(DMA).The results show that the addition of Schiff base can reduce the melting and curing temperatures of the blended system,which makes the curing reaction easier;the addition of Schiff base also increases the glass transition temperature(Tg)of the blended system and maintains better thermal stability.Besides,the chemical structures of Schiff base compounds have a certain influence on their reactivity with BMI and the heat resistance and thermal stability of corresponding polymers.