聚酯/碳纤维复合材料的自修复性能研究

Self-healing properties of polyester/carbon fiber composites

合成了脲醛树脂/环氧树脂微胶囊,并作为功能材料设计自修复聚酯/碳纤维复合材料。采用力学性能测试,扫描电子显微镜(SEM)和光学显微镜(OM)对微胶囊功能材料和自修复材料进行研究。碳纤维能够提高材料的弹性模量,在材料损伤过程中,控制裂缝的宽度。微胶囊具有增韧效果和自修复能力。经过拉伸复合材料内部产生裂纹。微胶囊在裂纹前端应力的作用下,囊壁破裂,囊芯流出润湿裂纹表面粘接裂纹,实现材料自修复。裂纹终止的形式包括微胶囊破裂终止、碳纤维阻碍终止和裂纹交叉终止。

In this work,urea-formaldehyde resin/epoxy microcapsules were synthesized and used to design self-healing polyester/carbon fiber composite materials.Mechanical properties,scanning electron microscopy（SEM） and optical microscope（OM） were employed for a study on the microcapsules and self-repairing materials.Carbon fiber can improve the elastic modulus and control the width of cracks.Microcapsules have not only a toughening effect but also a self-healing effect.After stretching,the composite materials appear an internal cracks resulting from the front tip in stress response.Wall ruptures,core materials flow out and wet cracked surfaces,eventually bond cracking.Crack termination is observed in various forms including micro-capsules rupture,carbon fiber termination and other crack hinders across the cracking.