Abstract: Interphases at the adhesion bonded interfaces between aluminum sheet and polypropylene(PP)/and PP blended with maleic anhydride grafted polypropylene(PP-g-MAH) were studied by X-ray photoelectron spectroscopy (XPS), and a mechanism of coordination bonding at the interfaces was proposed. Compared to PP, for PP with addition of PP-g-MAH the spectra of Al 2p and O 1s at the surface of aluminum sheet shift to higher binding energy obviously, which indicates that chemical interaction between PP-g-MAH and surface of the aluminum sheet occurs, and as a result Al－O－C bond is formed. There is no chemical interaction between PP and surface of the aluminum sheet. The obvious improvement of the adhesion strength between aluminum sheet and PP with PP-g-MAH could be attributed to the formation of Al－O－C bonds.

Key words: Aluminum sheet/polypropylene laminated composite, Maleic anhydride grafted polypropylene (PP-g-MAH), Interphase, Coordinative bond, X-ray photoelectron spectroscopy(XPS)