苯乙烯-双马来酰亚胺共聚物的电子束辐照合成及表征

Synthesis and Characterization of Polybismaleimide Through Electron Beam Initiated Chemical Process

以优选质量配比约为10∶1的双马来酰亚胺(BMI)前驱液与苯乙烯为原料,在超声波细胞粉碎机中均匀共混,采用束流为8.5mA的电子束引发反应,完成了BMI前驱液中聚酰胺酸的酰亚胺化,合成了苯乙烯-双马来酰亚胺共聚物。电子束辐照法具有均匀、高效和无需引发剂的显著优点。傅立叶变换红外(FT-IR)谱图分析结果表明,电子束辐照实现了酰亚胺结构的产生,并引发了BMI与苯乙烯中CC双键的自由基共聚。热分析结果表明,所制得的共聚物具有良好的热稳定性,热分解峰值温度高达452.18℃。

Selected about 10% mass percentage of styrene was uniformly blended into bismaleimide （BMI） precursor in solution in the ultrasonic sound-proofing case. The acid imidization of polyamide acid and the synthesis of poly-bismaleim- ide were carried out with different dose of electron beam in a linear accelerator under the beam-current of 8.5 mA. The Fourier transform infrared spectra indicate that C =C double bonds are activated for chain reaction through electron beam irradiation and the structure of polyimide is formed. Results of TG/DTA analysis reveal the generated polymer had good thermal stability,and the thermal decomposition peak temperature reaches up to 452.18 ℃. Compared with the thermal initiation method,electron beam irradiation has advantages of efficience,uniform and anti-implosion.