(中南大学 材料科学与工程学院, 长沙 410083)
摘 要: 采用扫描电镜研究了铝板/聚丙烯粘接试样的拉伸剪切断面形貌特征， 分析了其形成原因以及马来酸酐接枝聚丙烯的作用。研究结果表明： 当PP中不含MPP时， 界面粘接强度低， 拉伸剪切时表现为铝板/聚丙烯粘接界面的破坏； 在PP中添加MPP后， MPP与铝材表面的-NH2反应形成化学配位键， 界面粘接强度高，且MPP增强了球晶之间的连接链数，强化了球晶之间及晶态相与非晶态相之间的变形协调性， 拉伸剪切时破坏未发生于粘接界面， 断裂前塑料发生了剧烈的塑性变形。
关键字: 铝板/聚丙烯复合材料；马来酸酐接枝聚丙烯； 粘接； 断裂； 拉伸剪切
aluminum sheet/polypropylene/aluminum sheet
（College of Materials Science and Engineering,
Central South University, Changsha 410083, China）
Abstract: The features of the shear fractured surface of the adhesion bonded aluminum sheet/polypropylene/aluminum sheet were examined by scanning electron microscopy(SEM). The formation of these features and the role of the maleic anhydride grafted polypropylene(MPP) were analyzed. The results show that the adhesion strength is low and the adhesion bonded aluminum sheet/polypropylene/aluminum sheet fractures at the interface when there is no MPP in PP. With MPP blended into PP, the polar functional group of MPP will covalent chemically with amino group -NH2 linked to the aluminum surface, and good adhesion strength is achieved. MPP improves the linkage of spherulitic structures and the deformation compatibility between spherulitic structures and between crystal phases and amorphous phases. The bonded PP shows severe plastic deformation and the fracture occurs in PP.
Key words: aluminum sheet/polypropylene composite; maleic anhydride grafted polypropylene; adhesion; fracture; single lap shear
