制备了4种分子量不同的刚性聚醚酰亚胺齐聚物(PEI),研究了不同分子量的PEI改性乙烯基酯树脂对其固化物力学性能的影响。结果表明:分子量不同的PEI在最佳含量改性乙烯基酯树脂固化物时弯曲强度变化不大,均在105MPa左右;冲击韧性则有大幅度的提高,其中当PEI相对分子质量为1373.1,特性黏度为5.3dL/g,质量含量占15%时,冲击韧性达到16.8kJ/m2,约为未改性树脂(冲击韧性为3.8kJ/m2)的5倍。 Four kinds of rigid polyetherimide oligomers (PEI) with different molecular weights were prepared. The effects of PEI modified vinyl ester resins with different molecular weights on the mechanical properties of the cured products were studied. The results showed that the flexural strength of PEI with different molecular weights did not change much when the content of modified vinyl ester resin was the best, both of which were about 105 MPa; while the impact toughness was greatly improved. When the relative molecular mass of PEI was 1373.1, The viscosity of 5.3dL / g, the mass content of 15%, the impact toughness of 16.8kJ / m2, about unmodified resin (impact toughness of 3.8kJ / m2) 5 times.