双马来酰亚胺/聚醚砜复相树脂相结构与热性能

摘要

利用SEM、DMA和TGA研究双马来酰亚胺（BMI）/聚醚砜（PES）复相树脂微观相结构对热性能的影响。结果显示：BMI/PES复相树脂体系发生了相分离现象，当PES添加量达到15 phr时，复相树脂体系中产生了相反转结构，富BMI颗粒相被富PES相紧密包裹；相比于纯BMI树脂，BMI/PES复相树脂中归属于富BMI相的玻璃化转变温度Tg 升高；BMI/PES-5复相树脂中只有一个Tg，其起始模量降低对应的温度升高；随着PES添加量增大，BMI/PES复相树脂高温塑性行为更加明显；由于PES与BMI间良好的界面作用及富PES相的热防护作用，BMI/PES复相树脂的最大热失重温度和残炭率均得到显著增大；树脂体系在氮气氛围中的耐热性要优于空气氛围。%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 (Tg) belonging to BMI-rich phase of BMI/PES resin is higher than neat BMI resin. BMI/PES-5 resin system exhibits only one Tg 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.