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.
Influence of maleic anhydride grafted polypropylene on shear fractured surface of adhesion bonded aluminum sheet/polypropylene/aluminum sheet
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.