纳米微孔聚双马来酰亚胺的电子束化学合成初探

Preliminary synthesis of nano-pored polybismaleimide through electron beam initiated chemical processes

将选定配比的双马来酰亚胺(BMI)前驱体与甲基丙烯酸甲酯(MMA)在溶液中均匀共混,利用直线加速器产生的10MeV电子射线束引发反应,形成酰亚胺和降解性链段的微相分离固态结构体,程序升温至300℃做后续热处理去除辐解产物,获得了具有纳米孔径的微孔化聚双马来酰亚胺(PBMI)功能材料。红外光谱分析结果表明,电子束引发了BMI前驱体中的CC双键的开链聚合反应,并有酰亚胺化反应发生;原子力显微镜观察表明,所得纳米微孔其分布均匀,孔径在50nm左右;通过TG/DTA联用技术发现,在300～310℃的失重率与MMA初始用量相等,并测得微孔化PBMI的热分解峰值温度为413℃。

Selected amount of methyl methacrylate（MMA） was uniformly blended into bismaleimide（BMI） in solution,reaction was induced by electron beam generated by a linear accelerator and micro-phase separated solid structure consisted of imide and radiation degradable chains was obtained.After that,the degraded products were removed through programmed heating up to 300℃,and nano-porous polybismaleimide（PBMI） functional materials were fabricated.The CC double bonds were found to be activated for chain reaction through FT-IR analysis in the irradiation process,as well as the transforming reaction of amic acid to imide.The pore size is measured to be 50nm around by using an atomic force microscope.Results of TG/DTA analysis showed that the weight loss till 300-310℃ is equal to the initial usage of MMA,and the pyrolysis peak temperature of the fabricated nano-porous PBMI is measured to be 413℃.