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采用改性的单体反应物聚合法(MPMR)合成了一系列低黏度、耐高温异构聚酰亚胺树脂,研究了树脂预聚物分子质量对树脂的高温流变行为、固化后热氧化稳定性的影响,并对树脂的分子结构及其复合材料的加工工艺性能、力学性能进行了表征。结果表明:树脂预浸液常温储存期大于两个月,亚胺化后PI-2纯树脂最低黏度为154Pa.s,固化后树脂质量损失5%的温度大于560℃;石英纤维/PI-2树脂基复合材料在室温和500℃的弯曲强度分别为917、197MPa,弯曲模量分别为29、22GPa,拉伸强度分别为760、341MPa,拉伸模量分别为32、31GPa,压缩强度分别为570、95MPa,层间剪切强度分别为62、10MPa。
A series of low viscosity and high temperature isomeric polyimide resins were synthesized by modified monomer reaction polymerization (MPMR). The rheological behavior of the resin at high temperature was studied. The thermal oxidation Stability and the molecular structure of the resin and its composite processing performance, mechanical properties were characterized. The results show that the storage time of resin prepreg is more than two months at room temperature, the minimum viscosity of PI-2 pure resin after imidization is 154Pa.s, the temperature of cured resin is 5% The flexural strength of resin-based composites at room temperature and 500 ℃ were 917,197MPa, flexural modulus of 29,22GPa, tensile strength of 760,341MPa, tensile modulus of 32,31GPa, compressive strength of 570,95MPa, interlaminar shear strength of 62,10MPa.