【摘要】 纤维增强树脂基复合材料的典型结构之一为层合结构,较弱的层间性能引起的分层是层合结构失效破坏的主要因素。本文首先采用聚乙烯甲基丙烯酸（EMAA）和碳纳米管（CNT）制备了无孔实心膜和多孔夹芯膜两种EMAA/CNT复合薄膜。然后,将两种复合薄膜分别引入玻璃纤维/环氧层合板的中间界面,研究其对Ⅱ型层间断裂韧性(G_ⅡC)的增韧效果和对Ⅱ型裂纹的自修复性能。结果表明:多孔EMAA/CNT夹芯膜具有较佳的增韧和修复性能,相比纯玻璃纤维/环氧的空白试样,多孔EMAA/CNT夹芯膜增强板的G_ⅡC提高了19. 6%,并且通过热激励修复后其G_ⅡC的修复率为92. 5%;而无孔EMAA/CNT实心膜增强板的G_ⅡC降低了27. 5%,其G_ⅡC的修复率为81. 8%。微观表征表明,多孔夹芯膜与环氧在层间形成均匀的结构,从而起到良好的增韧和修复作用。更多还原

【Abstract】 Laminated structure is a major structure of fiber reinforced plastics,and delamination caused by weak interlaminar properties will cause a final failure to the laminates. In this paper,poly（ ethylene-co-methacrylic acid）（ EMAA） and carbon nanotube（ CNT） are used to prepare two kinds of EMAA/CNT composite films,i.e.,solid and porous membranes. Then,these two films were respectively introduced into the middle interface of glass fiber/epoxy laminates,and how the films affected the mode Ⅱ interlaminar fracture toughness( G_ⅡC) and its selfhealing were studied. The results show that porous EMAA/CNT film has better toughening and self-healing properties. Compared with the glass fiber/epoxy blank laminate,porous EMAA/CNT film improves the G_ⅡCby 19. 6%,which can be recovered to 92. 5% after thermally self-healing. However,solid EMAA/CNT film would decrease the G_ⅡCby 27. 5%,although the self-healing efficiency is 81. 8%. Microscopic characterization shows that uniform distribution of the porous EMAA/CNT and epoxy at interlaminar interface plays a positive role in toughening and selfhealing.更多还原