氯化镧对苯并噁嗪热稳定性的影响及机理研究

The influence of lanthanum chloride on the thermal stability of polybenzoxazines and its mechanism study

采用溶液法将氯化镧加入3种不同结构的苯并噁嗪中,制备了浇注体,对固化产物进行了热失重测试和红外光谱分析,并对热降解逸出气体进行了红外光谱分析。结果表明,氯化镧的加入使得苯并噁嗪的热稳定性和残炭率有很大提高。加入氯化镧的苯并噁嗪固化物中形成了较多苯胺对位连接的Mannich桥结构,推迟了苯胺结构的降解,从而提高了苯并噁嗪的热稳定性。

Lanthanum chloride（ LaCl3 ） was incorporated into three benzoxazines with different structures by solution method and the casting was prepared. The cured products were characterized by Fourier transform infrared spectroscopy （FTIR） and thermogravimetric analysis （TGA）. The evolved gases from the degradation of poly- benzoxazines were characterized by TIR. The results showed that the thermal stability and char yield of polybenzoxazines were improved greatly by adding LaCl3 . Many arylamine Mannich bridges were formed in the structures of cured samples, which could delay the degradation of arylamine structures. Thus the stability of polybenzoxazines was improved.