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采用二元胺扩链改性，以提高前文［１］研究的低温固化共聚型ＢＭＩ树脂的韧性。研究了扩链ＢＭＩ树脂的配方、反应性、工艺性及其浇铸体和复合材料的性能。结果表明，改性ＢＭＩ树脂的固化温度降到了１５０℃，韧性得到提高，复合材料性能优异。浇铸体弯曲强度１１９ＭＰａ，热变形温度２７２℃；玻璃纤维复合材料弯曲强度２０３４ＭＰａ，短梁剪切强度９１．８ＭＰａ。
Using diamine chain extension modified to improve the toughness of the low temperature curing copolymer type BMI resin studied in [1]. The formulation, reactivity and processability of the chain-extended BMI resin and the properties of the cast-in-place and composite materials were studied. The results showed that the curing temperature of the modified BMI resin dropped to 150 ℃, the toughness was improved and the composite material was excellent. The bending strength of casting body is 119MPa and the heat distortion temperature is 272 ℃. The flexural strength of glass fiber composites is 2034MPa and the shear strength of short beam is 91.8MPa.