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- 2017
双马来酰亚胺共聚改性及性能
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Abstract:
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G IC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℃×2 h+180℃×2 h+200℃×2 h+230℃×4 h，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 17.2 kJ/m2 and 316 J/m2, which are increased by 66.3% and 39.8% than before modifying, respectively. Furthermore, the tensile strength and flexural strength are up to 101.0 MPa and 165.0 MPa, 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℃×2 h+180℃×2 h +200×2 h+230℃×4 h. 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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