PMR型增韧聚酰亚胺的制备与性能研究

制备了系列PMR型聚酰亚胺基体树脂以及碳纤维增强复合材料(HFPI),系统研究了PMR型聚酰亚胺HFPI基体树脂及复合材料性能.制备的PMR型聚酰亚胺HFPI基体树脂溶液具有良好的储存稳定性,室温下可以存放4个月,不产生沉淀;PMR型聚酰亚胺HFPI基体树脂具有良好的成型性以及优异的热稳定性,热分解温度高达540℃、玻璃化转变温度达到290℃(DMA)、热膨胀系数在40～50ppm/℃之间、较低吸水率(1.0%～1.7%)、优异力学性能;用短切碳纤维增强HFPI,基体树脂与碳纤维具有良好黏附性,制备的复合材料除了具有良好加工成型性能外,更具有优异力学性能,拉伸强度高达107.3MPa,断裂伸长率为5.73%,弯曲强度和弯曲模量分别高达159.8MPa,6.11GPa.

Synthesis and Properties of PMR-Type Polyimide Composites with Improved Flexibility

A series of novel PMR polyimide(HFPI) matrix resins were synthesized and fully characterization.It was found that the matrix resin solutions were stable for a period of four months at room temperature and showed good adhension on carbon fibers.The short carbon fiberreinforced HFPI composites showed excellent thermal stability and good mechanical properties,with flexural strength and tensile strength of 159.8MPa and 107.3MPa,respectively.And the flexural moduli and tensile moduli were in the range of 5.7-6.1 GPa and 3.0~3.1 GPa,respectively.The good thermal,low moisture uptake(<1.7%),and excellent mechanical properties as well as the good processibility demonstrated that the PMR polyimides(HFPI) were candidates as matrix resines of carbon fiber-reinforced composites for advanced materials applications in aerospace industry.