邻位酰亚胺双官能化苯并恶嗪的合成及固化

Synthesis and curing of ortho-imide difunctional benzoxazine monomer

通过溶剂法合成了邻位酰亚胺双官能化苯并恶嗪单体化合物(oPP-ddm)。采用核磁共振氢谱、傅里叶变换红外光谱和元素分析证实了其分子结构,以示差扫描量热分析法和原位红外图谱研究了其热固化行为及机理。结果表明,oPP-ddm的起始固化温度为220℃,固化峰值温度为243℃。利用Kissinger和Ozawa法分别计算出该苯并恶嗪单体的活化能为151.7和152.1 kJ/mol。该化合物中与酰亚胺基团相连的苯环可增强酰亚胺基团的亲电效应,从而有效促进化合物中酰亚胺邻位上恶嗪环的开环固化。

The difunetional benzoxazine monomer with ortho-imide functionality（oPP-ddm ） was synthesized by solution method. The chemical structure of synthesized monomers was confirmed by IH-NMR, FT-IR and elemental analysis. Its thermal curing behavior and mechanism were investigated by DSC and in situ FT-IR. The results showed that the initial curing temperature and curing peak temperature was 220℃ and 243℃, repectively. The activation energy of oPP-ddm was 151.7 and 152.1 kJ/mol calculated by Kissinger and Ozawa methods. The benzene ring attached to the imide group could improve the electrophilicity of imide group and significantly promote the ring-opening of oxazine ring.