脂环族酰亚胺单官能化苯并恶嗪的合成及性能

Synthesis and properties of aliphatic imide functional benzoxazines

通过溶剂法合成了三种新型脂环族酰亚胺官能化苯并恶嗪单体pHTI-a、pHHI-a和pMHI-a。通过核磁共振氢谱(1H-NMR)、碳谱(13C-NMR)以及傅里叶变换红外光谱(FT-IR)确定了这三种恶嗪单体的分子结构,并且通过示差扫描量热分析法(DSC)以及原位红外图谱(in situ FT-IR)研究了其热开环固化行为。研究发现这三种苯并恶嗪单体的放热峰值温度相近,脂环族酰亚胺端基的特性对恶嗪环开环无显著影响。最后通过热失重分析(TGA)对这三种固化后聚苯并恶嗪树脂的耐热性能进行了表征,不饱和脂环族酰亚胺端基的聚苯并恶嗪具有最为优异的热稳定性。

Three novel aliphatic imide-functionalized benzoxazine monomers pHTI-a,pHHI-a and pMHI-a were synthesized by solvent method.The molecular structures of the three benzoxazine monomers were confirmed by using 1 H-NMR,13 C-NMR and FT-IR,and the thermal ring-opening curing behavior was investigated by using differential scanning calorimetry(DSC)and in situ infrared spectroscopy(in situ FT-IR).It was found that the maximum temperatures of the exothermic peaks of these benzoxazine monomers were very close and the characteristics of alicyclic imide end groups had no significant effect on the ring opening of the oxazine ring.The thermal stabilitiles of the three cured polybenzoxazines were studied by thermogravimetric analysis(TGA)and the polybenzoxazine with unsaturated aliphatic imide end-cap showed the most excellent thermal stability.