Mixtures of different benzoxazine resins and elemental sulfur (S8) are prepared and then reacted at 120 °C, below the temperature for radical formation of sulfur. The progress of the reaction and the chemical structures of the main products are monitored and characterized by proton nuclear magnetic resonance spectroscopy (1H NMR) and Fourier transform infrared spectroscopy (FT-IR). Thermal analysis
制备了不同的苯并恶嗪树脂和元素硫(S 8)的混合物,然后在低于该温度的120°C下反应生成硫自由基。通过质子核磁共振波谱(1 H NMR)和傅立叶变换红外光谱法(FT-IR)对反应进程和主要产物的化学结构进行监测和表征。还通过差示扫描量热法(DSC)对所有反应系统进行热分析。在苯并恶嗪中引入S 8会在反应体系中产生一个带有席夫碱和酚式-OH的新结构,当低至5 mol%时,它会引发聚合温度降低约15%。添加S 8。