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

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℃.