(中南大學(xué) 材料科學(xué)與工程學(xué)院, 長(zhǎng)沙 410083)
摘 要: 采用掃描電鏡研究了鋁板/聚丙烯粘接試樣的拉伸剪切斷面形貌特征， 分析了其形成原因以及馬來(lái)酸酐接枝聚丙烯的作用。研究結(jié)果表明： 當(dāng)PP中不含MPP時(shí)， 界面粘接強(qiáng)度低， 拉伸剪切時(shí)表現(xiàn)為鋁板/聚丙烯粘接界面的破壞； 在PP中添加MPP后， MPP與鋁材表面的-NH2反應(yīng)形成化學(xué)配位鍵， 界面粘接強(qiáng)度高，且MPP增強(qiáng)了球晶之間的連接鏈數(shù)，強(qiáng)化了球晶之間及晶態(tài)相與非晶態(tài)相之間的變形協(xié)調(diào)性， 拉伸剪切時(shí)破壞未發(fā)生于粘接界面， 斷裂前塑料發(fā)生了劇烈的塑性變形。
關(guān)鍵字: 鋁板/聚丙烯復(fù)合材料；馬來(lái)酸酐接枝聚丙烯； 粘接； 斷裂； 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
