Phase structure and thermal properties of bismaleimide/polyethersulfone multi-phase resin system

• Main Authors: DONG Huimin, AN Xuefeng, YAN Li, QIAN Huanghai, CHENG Lijun, LIU Liping, LI Yueteng
• Format: Article
• Language: zho
• Published: Journal of Aeronautical Materials 2019-06-01
• Series: Journal of Aeronautical Materials
• Subjects: polyethersulfone (PES); bismaleimide (BMI); phase structure; glass transition; dynamic thermomechanical analysis (DMA); thermogravimetric analysis (TGA)
• Online Access: http://jam.biam.ac.cn/CN/Y2019/V39/I3/81

The effect of micro phase morphology of bismaleimide (BMI)/polyethersulfone (PES) multi-phase system on the thermal properties was studied by SEM, DMA and TGA. The SEM results suggest that the phase separation exists in the multi-phase BMI/PES resin. Phase inversion happens with the addition of PES up to 15 phr. SEM shows that the subtle micro structure with fine BMI-rich particulate phases is surrounded by continuous PES-rich phase. The glass transition temperature (<i>T_g</i>) belonging to BMI-rich phase of BMI/PES resin is higher than neat BMI resin. BMI/PES-5 resin system exhibits only one <i>T_g</i> and the temperature corresponding to the decrease of initial modulus increased. The high-temperature plastic behavior of BMI/PES resin system is enhanced with the increase of PES. The peak thermal decomposition temperature and char yield of BMI/PES resin are enhanced owing to the excellent interface interaction between BMI and PES as well as the thermal protection effect of PES. The heat resistance of resin systems under N₂ atmosphere are superior to the systems under air atmosphere.