采用侧甲基双马来酰亚胺(T-BMI)对4,4'-二苯甲烷型双马来酰亚胺(BDM)进行共聚改性制备一种高韧性基体树脂.研究结果表明:T-BMI-BDM改性共聚体系的力学性能得到明显的改善,当T-BMI与BDM的摩尔比为1∶1 时,冲击强度和断裂韧性GIC分别达到17.2 kJ/m2和316 J/m2,比改性前分别提高了66.3%和39.8%;共聚体系的拉伸强度和弯曲强度分别达到101.0 MPa和165.0 MPa,比改性前分别提高了12.2%和2.5%;DMA和TG分析结果表明,T-BMI-BDM改性共聚体系的热性能没有明显下降,玻璃化转变温度和5%热失重温度分别达到了267.2 ℃和403.7℃;通过改性共混体系DSC曲线分析确定其固化工艺条件为160℃×2h+180℃×2h +200℃×2h+230℃×4h,通过改性共混体系黏度-温度和黏度-时间曲线分析确定其流变性能适用于复合材料RTM成型工艺,适宜的注射温度为125~140℃.
T-typed bismaleimide (T-BMI) was used to blend with 4,4'-bismaleimidodiphenylmethyene (BDM) for preparing a matrix resin with high toughness.The results show that T-BMI has great effect on improving the mechanical performances of the matrix resin.With the same mole between T-BMI and BDM,the impact strength and fracture toughness (GIC value) of T-BMI-BDM reach up to 17.2kJ/m2 and 316J/m2,which are increased by 66.3% and 39.8% than before modifying,respectively.Furthermore,the tensile strength and flexural strength are up to 101.0MPa and 165.0MPa,they are improved by 12.2% and 2.5% than before modifying,respectively.The analysis of DMA and TG show that the heat-resistance and thermal stabilities of the copolymerization system are not significantly influenced by introduced T-BMI.The glass transition temperature and 5% mass loss temperature are 267.2℃ and 403.7℃,respectively.Cure condition of the matrix resin determined by DSC curves are 160℃×2h+180℃×2h +200×2h+230℃×4h.Rheological property determined by viscosity-temperature and viscosity-time curves indicates that it can be suitable for RTM process,and resin injection temperature should be selected in the range of 125℃to 140℃.
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